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<?xml version="1.0" encoding="utf-8"?>
<rss version="2.0">
<channel>
<title>xiaotiandada/blog Issues</title>
<link>http://example.com/</link>
<description>xiaotiandada/blog Issues</description>
<lastBuildDate>Wed, 29 Jun 2022 10:57:05 GMT</lastBuildDate>
<docs>https://validator.w3.org/feed/docs/rss2.html</docs>
<generator>https://github.com/jpmonette/feed</generator>
<language>zh-CN</language>
<copyright>All rights reserved 2022, xiaotian</copyright>
<item>
<title><![CDATA[[NodeJS] TypeError: string.replaceAll is not a function]]></title>
<link>https://github.com/xiaotiandada/blog/issues/116</link>
<guid>https://github.com/xiaotiandada/blog/issues/116</guid>
<pubDate>Wed, 29 Jun 2022 04:19:50 GMT</pubDate>
<description><![CDATA[<ul>
<li><a href="https://yongjinkim.com/nodejstypeerror-string-replaceall-is-not-a-function-%E3%81%AE%E8%A7%A3%E6%B1%BA%E6%96%B9%E6%B3%95/">https://yongjinkim.com/nodejstypeerror-string-replaceall-is-not-a-function-の解決方法/</a></li>
</ul>
<p><code>String.prototype.replaceAll()</code></p>
<p>错误环境</p>
<ol>
<li>Github Actions 14x 测试报错</li>
<li>vercel 14x 环境运行报错</li>
</ol>
<p>解决方案</p>
<ol>
<li>升级 v15+</li>
<li>替换为 replace</li>
</ol>
]]></description>
</item>
<item>
<title><![CDATA[Webpack]]></title>
<link>https://github.com/xiaotiandada/blog/issues/115</link>
<guid>https://github.com/xiaotiandada/blog/issues/115</guid>
<pubDate>Sat, 25 Jun 2022 09:56:37 GMT</pubDate>
<description><![CDATA[<p>Babel 7 不需要 ts-loader。从 Babel 7 开始，ts-loader 是不必要的，因为 Babel 7 支持 TypeScript</p>
<ul>
<li><a href="https://github.com/Microsoft/TypeScript-Babel-Starter">https://github.com/Microsoft/TypeScript-Babel-Starter</a></li>
<li><a href="https://stackoverflow.com/questions/38320220/how-to-setup-typescript-babel-webpack">https://stackoverflow.com/questions/38320220/how-to-setup-typescript-babel-webpack</a></li>
<li><a href="https://babeljs.io/docs/en/babel-preset-typescript">https://babeljs.io/docs/en/babel-preset-typescript</a></li>
<li><a href="https://devblogs.microsoft.com/typescript/typescript-and-babel-7/">https://devblogs.microsoft.com/typescript/typescript-and-babel-7/</a></li>
</ul>
]]></description>
</item>
<item>
<title><![CDATA[Jest]]></title>
<link>https://github.com/xiaotiandada/blog/issues/114</link>
<guid>https://github.com/xiaotiandada/blog/issues/114</guid>
<pubDate>Mon, 27 Jun 2022 15:29:45 GMT</pubDate>
<description><![CDATA[<ul>
<li><a href="https://jestjs.io/">https://jestjs.io/</a></li>
<li><a href="https://www.jianshu.com/p/c1b5676c1edd">https://www.jianshu.com/p/c1b5676c1edd</a></li>
</ul>
<h2>Next + TypeScript + Jest</h2>
<pre><code> /node_modules/parse-domain/build/main.js:3
export { parseDomain, ParseResultType, } from "./parse-domain.js";
^^^^^^
SyntaxError: Unexpected token 'export'
1 | import assert from 'assert'
> 2 | import { fromUrl, parseDomain, ParseResultType } from 'parse-domain'
| ^
3 | import { toUnicode } from 'punycode'
4 |
</code></pre>
<p>忽略转换模式, 不起作用，直接删除 node_modules 反而生效. 但是会变慢...</p>
<pre><code class="language-js"> transformIgnorePatterns: [
'!node_modules/',
// '/node_modules/',
],
</code></pre>
<p>新的解决方案, 忽略一些报错的包</p>
<pre><code class="language-js"> transformIgnorePatterns: [
'/node_modules/(?!parse-domain|is-ip|ip-regex|uuid)', // SyntaxError: Unexpected token 'export'
],
</code></pre>
<pre><code> ● Test suite failed to run
ReferenceError: TextEncoder is not defined
1 | import assert from 'assert'
> 2 | import { fromUrl, parseDomain, ParseResultType } from 'parse-domain'
| ^
3 | import { toUnicode } from 'punycode'
</code></pre>
<p>设置 <code>TextEncoder</code></p>
<ul>
<li><a href="https://github.com/inrupt/solid-client-authn-js/issues/1676#issuecomment-917016646">https://github.com/inrupt/solid-client-authn-js/issues/1676#issuecomment-917016646</a></li>
<li><a href="https://stackoverflow.com/questions/57712235/referenceerror-textencoder-is-not-defined-when-running-react-scripts-test/72734315#72734315">https://stackoverflow.com/questions/57712235/referenceerror-textencoder-is-not-defined-when-running-react-scripts-test/72734315#72734315</a></li>
<li><a href="https://github.com/microsoft/accessibility-insights-web/pull/5421#issuecomment-1109168149">https://github.com/microsoft/accessibility-insights-web/pull/5421#issuecomment-1109168149</a></li>
<li><a href="https://github.com/microsoft/accessibility-insights-web/pull/5421/commits/9ad4e618019298d82732d49d00aafb846fb6bac7#diff-c4f1d9c9d7b982f26536dbd6bf8c0804c1c0011fba8bc6df6e937363acfffa1f">https://github.com/microsoft/accessibility-insights-web/pull/5421/commits/9ad4e618019298d82732d49d00aafb846fb6bac7#diff-c4f1d9c9d7b982f26536dbd6bf8c0804c1c0011fba8bc6df6e937363acfffa1f</a></li>
<li><a href="https://blog.csdn.net/weixin_42429288/article/details/124590185">https://blog.csdn.net/weixin_42429288/article/details/124590185</a></li>
<li><a href="https://github.com/vercel/next.js/blob/canary/examples/with-jest/jest.config.js">https://github.com/vercel/next.js/blob/canary/examples/with-jest/jest.config.js</a></li>
<li><a href="https://github.com/vercel/next.js/blob/canary/examples/with-jest-babel/jest.config.js">https://github.com/vercel/next.js/blob/canary/examples/with-jest-babel/jest.config.js</a></li>
<li><a href="https://juejin.cn/post/6844903942023823367#heading-8">https://juejin.cn/post/6844903942023823367#heading-8</a></li>
</ul>
<pre><code class="language-js">// ...
setupFiles: [`<rootDir>/jest-shim.js`],
testEnvironment: 'jest-environment-jsdom',
// ...
</code></pre>
<pre><code class="language-js">import { TextDecoder, TextEncoder } from 'util'
global.TextEncoder = TextEncoder
global.TextDecoder = TextDecoder
</code></pre>
<h2>decorators-legacy</h2>
<ul>
<li><a href="https://stackoverflow.com/questions/52262084/syntax-error-support-for-the-experimental-syntax-decorators-legacy-isnt-cur">https://stackoverflow.com/questions/52262084/syntax-error-support-for-the-experimental-syntax-decorators-legacy-isnt-cur</a></li>
<li><a href="https://babeljs.io/docs/en/babel-plugin-proposal-decorators">https://babeljs.io/docs/en/babel-plugin-proposal-decorators</a></li>
</ul>
<pre><code>Support for the experimental syntax 'decorators-legacy' isn't currently enabled (23:3):
</code></pre>
<h2>Env</h2>
<ul>
<li><a href="https://blog.shinki.net/posts/nextjs-jest-environment-variable">https://blog.shinki.net/posts/nextjs-jest-environment-variable</a></li>
<li><a href="https://nextjs.org/docs/basic-features/environment-variables">https://nextjs.org/docs/basic-features/environment-variables</a></li>
</ul>
<pre><code class="language-js">import { loadEnvConfig } from '@next/env'
const projectDir = process.cwd()
loadEnvConfig(projectDir)
</code></pre>
<h2>baseUrl paths</h2>
<ul>
<li><a href="https://stackoverflow.com/questions/50171412/jest-typescript-absolute-paths-baseurl-gives-error-cannot-find-module">https://stackoverflow.com/questions/50171412/jest-typescript-absolute-paths-baseurl-gives-error-cannot-find-module</a></li>
<li><a href="https://jestjs.io/zh-Hans/docs/configuration#moduledirectories-arraystring">https://jestjs.io/zh-Hans/docs/configuration#moduledirectories-arraystring</a></li>
</ul>
<pre><code class="language-js"> moduleDirectories: ['<rootDir>/node_modules', '<rootDir>'],
</code></pre>
]]></description>
</item>
<item>
<title><![CDATA[Cross-Origin-Embedder-Policy]]></title>
<link>https://github.com/xiaotiandada/blog/issues/113</link>
<guid>https://github.com/xiaotiandada/blog/issues/113</guid>
<pubDate>Wed, 15 Jun 2022 13:52:08 GMT</pubDate>
<description><![CDATA[<ul>
<li><a href="https://developer.mozilla.org/zh-CN/docs/Web/HTTP/Headers/Cross-Origin-Embedder-Policy">https://developer.mozilla.org/zh-CN/docs/Web/HTTP/Headers/Cross-Origin-Embedder-Policy</a></li>
<li><a href="https://developer.chrome.com/blog/coep-credentialless-origin-trial/">https://developer.chrome.com/blog/coep-credentialless-origin-trial/</a></li>
<li><a href="https://web.dev/coop-coep/?utm_source=devtools">https://web.dev/coop-coep/?utm_source=devtools</a></li>
<li><a href="https://github.com/WICG/credentiallessness">https://github.com/WICG/credentiallessness</a></li>
<li><a href="https://github.com/WICG/proposals/issues/31">https://github.com/WICG/proposals/issues/31</a></li>
<li><a href="https://web.dev/i18n/zh/why-coop-coep/">https://web.dev/i18n/zh/why-coop-coep/</a></li>
</ul>
<pre><code class="language-ts">Cross-Origin-Embedder-Policy: unsafe-none | require-corp
</code></pre>
<p>相关信息 #111</p>
<img width="748" alt="image" src="https://user-images.githubusercontent.com/24250627/173811159-804ede52-80fc-4519-af82-8270deb3b63f.png">
]]></description>
</item>
<item>
<title><![CDATA[Cross-Origin-Opener-Policy]]></title>
<link>https://github.com/xiaotiandada/blog/issues/112</link>
<guid>https://github.com/xiaotiandada/blog/issues/112</guid>
<pubDate>Mon, 13 Jun 2022 17:10:53 GMT</pubDate>
<description><![CDATA[<ul>
<li><a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Cross-Origin-Opener-Policy">https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Cross-Origin-Opener-Policy</a></li>
</ul>
<pre><code class="language-ts">[
{
key: 'Cross-Origin-Embedder-Policy',
value: 'require-corp',
},
{
key: 'Cross-Origin-Opener-Policy',
value: 'same-origin',
},
]
</code></pre>
<p>如果需要浏览器支持 <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/SharedArrayBuffer">SharedArrayBuffer</a> 需要设置 header <code>same-origin</code></p>
<pre><code class="language-ts">Cross-Origin-Opener-Policy: same-origin
Cross-Origin-Embedder-Policy: require-corp
</code></pre>
<ul>
<li><a href="https://web.dev/why-coop-coep/?utm_source=devtools">https://web.dev/why-coop-coep/?utm_source=devtools</a></li>
<li><a href="https://developer.chrome.com/docs/extensions/mv3/cross-origin-isolation/">https://developer.chrome.com/docs/extensions/mv3/cross-origin-isolation/</a></li>
<li><a href="https://github.com/camillelamy/explainers/blob/main/anonymous_iframes.md">https://github.com/camillelamy/explainers/blob/main/anonymous_iframes.md</a></li>
<li><a href="https://developer.chrome.com/origintrials/#/register_trial/303992974847508481">https://developer.chrome.com/origintrials/#/register_trial/303992974847508481</a></li>
<li><a href="https://blog.agektmr.com/2021/11/cross-origin-isolation.html">https://blog.agektmr.com/2021/11/cross-origin-isolation.html</a></li>
<li><a href="https://first-party-test.glitch.me/">https://first-party-test.glitch.me/</a></li>
<li><a href="https://stackoverflow.com/questions/70535752/enable-sharedarraybuffer-on-localhost">https://stackoverflow.com/questions/70535752/enable-sharedarraybuffer-on-localhost</a></li>
</ul>
<p>相关信息 #111</p>
]]></description>
</item>
<item>
<title><![CDATA[Cross-Origin Resource Policy (CORP)]]></title>
<link>https://github.com/xiaotiandada/blog/issues/111</link>
<guid>https://github.com/xiaotiandada/blog/issues/111</guid>
<pubDate>Mon, 13 Jun 2022 17:10:58 GMT</pubDate>
<description><![CDATA[<ul>
<li><a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Cross-Origin_Resource_Policy_(CORP)">https://developer.mozilla.org/en-US/docs/Web/HTTP/Cross-Origin_Resource_Policy_(CORP)</a></li>
<li><a href="https://web.dev/coop-coep/?utm_source=devtools">https://web.dev/coop-coep/?utm_source=devtools</a></li>
<li><a href="https://web.dev/same-site-same-origin/?utm_source=devtools">https://web.dev/same-site-same-origin/?utm_source=devtools</a></li>
</ul>
<p>如果父级设置了 <code>Cross-Origin-Opener-Policy</code></p>
<pre><code class="language-ts">[
{
key: 'Cross-Origin-Embedder-Policy',
value: 'require-corp',
},
{
key: 'Cross-Origin-Opener-Policy',
value: 'same-origin',
},
]
</code></pre>
<p>引用外部链接会无法工作，比如说 s3 img 资源。需要设置 header</p>
<p>example: <code>cross-origin-resource-policy: cross-origin</code></p>
<p><img src="https://user-images.githubusercontent.com/24250627/172420995-8a5a81ea-007d-4c42-b09e-38a241014389.png" alt="image"></p>
<pre><code class="language-ts">Cross-Origin-Resource-Policy: same-site | same-origin | cross-origin
</code></pre>
<p>引入 iframe easyRPG player 也会被阻止</p>
<p><img src="https://user-images.githubusercontent.com/24250627/173024097-faef9f19-b027-4a7a-94b8-5c18a4446c85.png" alt="image"></p>
<p>还会出现 <code>cross-origin-embedder-policy</code> 警告</p>
<p><img src="https://user-images.githubusercontent.com/24250627/173173791-2c74eede-75c5-420a-a2e3-480889e41197.png" alt="image"></p>
<pre><code>Cross-Origin-Embedder-Policy: require-corp
Cross-Origin-Resource-Policy: cross-origin
</code></pre>
]]></description>
</item>
<item>
<title><![CDATA[FileReader API]]></title>
<link>https://github.com/xiaotiandada/blog/issues/110</link>
<guid>https://github.com/xiaotiandada/blog/issues/110</guid>
<pubDate>Wed, 29 Jun 2022 04:10:47 GMT</pubDate>
<description><![CDATA[<ul>
<li><a href="https://developer.mozilla.org/zh-CN/docs/Web/API/FileReader">https://developer.mozilla.org/zh-CN/docs/Web/API/FileReader</a></li>
<li><a href="https://dev.to/j471n/preview-file-before-uploading-in-react-27kn">https://dev.to/j471n/preview-file-before-uploading-in-react-27kn</a></li>
</ul>
<hr>
<ul>
<li><a href="https://ant.design/components/upload-cn/">https://ant.design/components/upload-cn/</a></li>
</ul>
<pre><code class="language-tsx">const getBase64 = (img: RcFile, callback: (url: string) => void) => {
const reader = new FileReader();
reader.addEventListener('load', () => callback(reader.result as string));
reader.readAsDataURL(img);
};
</code></pre>
<p><a href="https://developer.mozilla.org/zh-CN/docs/Web/API/URL/createObjectURL">https://developer.mozilla.org/zh-CN/docs/Web/API/URL/createObjectURL</a> 也可以做图片预览</p>
]]></description>
</item>
<item>
<title><![CDATA[theme]]></title>
<link>https://github.com/xiaotiandada/blog/issues/109</link>
<guid>https://github.com/xiaotiandada/blog/issues/109</guid>
<pubDate>Thu, 16 Jun 2022 11:51:28 GMT</pubDate>
<description><![CDATA[<h3>Next.js</h3>
<ul>
<li><a href="https://github.com/xiaotiandada/next-theme">https://github.com/xiaotiandada/next-theme</a></li>
<li><a href="https://github.com/xiaotiandada/next-theme/blob/main/pages/_app.tsx">https://github.com/xiaotiandada/next-theme/blob/main/pages/_app.tsx</a></li>
</ul>
<p>如果需要 可以考虑用 cookie 传递服务端的主题，因为 next-themes 使用的是 localstore 存储
大部分情况 不需要
可供参考：<a href="https://github.com/xeoneux/next-dark-mode/blob/main/src/index.tsx">https://github.com/xeoneux/next-dark-mode/blob/main/src/index.tsx</a>
使用 cookies 不是一个好主意 <a href="https://github.com/pacocoursey/next-themes/issues/17">https://github.com/pacocoursey/next-themes/issues/17</a></p>
<p>使用 localstore 结合 MUI UI 库可能会有闪烁的情况，需要更能多的实践</p>
<h3>MUI</h3>
<pre><code class="language-ts">import { createTheme, ThemeOptions } from '@mui/material/styles'
// https://mui.com/material-ui/customization/default-theme/
// https://material.io/resources/color
const defaultTheme: ThemeOptions = {
typography: {
button: {
textTransform: 'none',
},
},
}
export const lightTheme = createTheme({
palette: {
mode: 'light',
primary: {
main: '#ff2449',
light: '#ff6675',
dark: '#c40022',
},
},
...defaultTheme,
})
export const darkTheme = createTheme({
palette: {
mode: 'dark',
primary: {
main: '#f93c5b',
light: '#ff7588',
dark: '#bf0032',
},
},
...defaultTheme,
})
</code></pre>
<h3>Disqus</h3>
<p>-<a href="https://stackoverflow.com/questions/65260505/disqus-iframe-transparency-wont-work-on-chrome-87">https://stackoverflow.com/questions/65260505/disqus-iframe-transparency-wont-work-on-chrome-87</a>
-<a href="https://github.com/w3c/csswg-drafts/issues/4772">https://github.com/w3c/csswg-drafts/issues/4772</a></p>
<h3>Algolia</h3>
<ul>
<li><a href="https://github.com/algolia/autocomplete/blob/next/packages/autocomplete-theme-classic/src/theme.scss#L107">https://github.com/algolia/autocomplete/blob/next/packages/autocomplete-theme-classic/src/theme.scss#L107</a></li>
<li><a href="https://dev.to/algolia/creating-an-omnibar-with-autocomplete-3jgh">https://dev.to/algolia/creating-an-omnibar-with-autocomplete-3jgh</a></li>
</ul>
]]></description>
</item>
<item>
<title><![CDATA[React Hook Form + MUI 构建表单]]></title>
<link>https://github.com/xiaotiandada/blog/issues/108</link>
<guid>https://github.com/xiaotiandada/blog/issues/108</guid>
<pubDate>Mon, 20 Jun 2022 16:00:00 GMT</pubDate>
<description><![CDATA[<ul>
<li><a href="https://react-hook-form.com/">https://react-hook-form.com/</a></li>
<li><a href="https://mui.com/zh/">https://mui.com/zh/</a></li>
<li><a href="https://codesandbox.io/u/bluebill1049">https://codesandbox.io/u/bluebill1049</a></li>
<li><a href="https://github.com/react-hook-form/react-hook-form/tree/master/examples">https://github.com/react-hook-form/react-hook-form/tree/master/examples</a></li>
</ul>
]]></description>
</item>
<item>
<title><![CDATA[seo]]></title>
<link>https://github.com/xiaotiandada/blog/issues/107</link>
<guid>https://github.com/xiaotiandada/blog/issues/107</guid>
<pubDate>Fri, 20 May 2022 03:33:29 GMT</pubDate>
<description><![CDATA[<ul>
<li><a href="https://search.google.com/search-console/about">https://search.google.com/search-console/about</a></li>
<li><a href="https://analytics.google.com/analytics/web/">https://analytics.google.com/analytics/web/</a></li>
<li><a href="https://ziyuan.baidu.com/linksubmit/url?sitename=">https://ziyuan.baidu.com/linksubmit/url?sitename=</a></li>
<li><a href="https://tongji.baidu.com/web/welcome/login">https://tongji.baidu.com/web/welcome/login</a></li>
<li><a href="https://github.com/w3itch-crafter/w3itch-frontend/issues/129">https://github.com/w3itch-crafter/w3itch-frontend/issues/129</a></li>
</ul>
<hr>
<ul>
<li><a href="https://zhuanlan.zhihu.com/p/150718629">google search console 终极教程</a></li>
<li><a href="https://ahrefs.com/blog/zh/robots-txt/">关于Robots.txt和SEO: 你所需要知道的一切</a></li>
<li><a href="https://github.com/iamvishnusankar/next-sitemap#building-sitemaps">https://github.com/iamvishnusankar/next-sitemap#building-sitemaps</a></li>
</ul>
<p>Next 使用 next-sitemap</p>
<h3>Server side index-sitemaps (getServerSideSitemapIndex)</h3>
<p>生成 sitemaps 索引，在大文件拆分应该可以用到</p>
<ul>
<li><a href="https://github.com/iamvishnusankar/next-sitemap#server-side-index-sitemaps-getserversidesitemapindex">https://github.com/iamvishnusankar/next-sitemap#server-side-index-sitemaps-getserversidesitemapindex</a></li>
</ul>
<pre><code class="language-tsx">// pages/server-sitemap-index.xml/index.tsx
import { getServerSideSitemapIndex } from 'next-sitemap'
import { GetServerSideProps } from 'next'
export const getServerSideProps: GetServerSideProps = async (ctx) => {
// Method to source urls from cms
// const urls = await fetch('https//example.com/api')
return getServerSideSitemapIndex(ctx, [
'https://example.com/path-1.xml',
'https://example.com/path-2.xml',
])
}
// Default export to prevent next.js errors
export default function SitemapIndex() {}
</code></pre>
<pre><code class="language-xml"><sitemapindex xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
<sitemap>
<loc>https://example.com/path-1.xml</loc>
</sitemap>
<sitemap>
</sitemapindex>
</code></pre>
<h3>server side sitemap (getServerSideSitemap)</h3>
<p>生成 sitemaps</p>
<ul>
<li><a href="https://github.com/iamvishnusankar/next-sitemap#server-side-sitemap-getserversidesitemap">https://github.com/iamvishnusankar/next-sitemap#server-side-sitemap-getserversidesitemap</a></li>
</ul>
<pre><code class="language-tsx">// pages/server-sitemap.xml/index.tsx
import { getServerSideSitemap } from 'next-sitemap'
import { GetServerSideProps } from 'next'
export const getServerSideProps: GetServerSideProps = async (ctx) => {
// Method to source urls from cms
// const urls = await fetch('https//example.com/api')
const fields = [
{
loc: 'https://example.com', // Absolute url
lastmod: new Date().toISOString(),
// changefreq
// priority
},
{
loc: 'https://example.com/dynamic-path-2', // Absolute url
lastmod: new Date().toISOString(),
// changefreq
// priority
},
]
return getServerSideSitemap(ctx, fields)
}
// Default export to prevent next.js errors
export default function Sitemap() {}
</code></pre>
<p><code>fields</code> TS is <code>ISitemapField[]</code></p>
<pre><code class="language-xml"><urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9" xmlns:news="http://www.google.com/schemas/sitemap-news/0.9" xmlns:xhtml="http://www.w3.org/1999/xhtml" xmlns:mobile="http://www.google.com/schemas/sitemap-mobile/1.0" xmlns:image="http://www.google.com/schemas/sitemap-image/1.1" xmlns:video="http://www.google.com/schemas/sitemap-video/1.1">
<url>
<loc>https://demo.io/game/65</loc>
<lastmod>2022-05-12T16:35:07.696Z</lastmod>
<changefreq>daily</changefreq>
<priority>0.7</priority>
</url>
</urlset>
</code></pre>
<h3>JSON-LD</h3>
<ul>
<li><a href="https://github.com/garmeeh/next-seo#json-ld">https://github.com/garmeeh/next-seo#json-ld</a></li>
<li><a href="https://search.google.com/test/rich-results">https://search.google.com/test/rich-results</a></li>
<li><a href="https://developers.google.com/search/docs/advanced/robots/robots_meta_tag?hl=zh-cn">https://developers.google.com/search/docs/advanced/robots/robots_meta_tag?hl=zh-cn</a></li>
</ul>
<img width="791" alt="image" src="https://user-images.githubusercontent.com/24250627/168475174-bc6729eb-1d65-4791-9f59-c16b5aba4c20.png">
]]></description>
</item>
<item>
<title><![CDATA[npm, yarn scripts 使用指南]]></title>
<link>https://github.com/xiaotiandada/blog/issues/106</link>
<guid>https://github.com/xiaotiandada/blog/issues/106</guid>
<pubDate>Wed, 29 Jun 2022 03:58:23 GMT</pubDate>
<description><![CDATA[<ul>
<li><a href="https://www.ruanyifeng.com/blog/2016/10/npm_scripts.html">npm scripts 使用指南</a></li>
<li><a href="https://yarnpkg.com/advanced/lifecycle-scripts">https://yarnpkg.com/advanced/lifecycle-scripts</a></li>
</ul>
]]></description>
</item>
<item>
<title><![CDATA[Yarn]]></title>
<link>https://github.com/xiaotiandada/blog/issues/105</link>
<guid>https://github.com/xiaotiandada/blog/issues/105</guid>
<pubDate>Sun, 29 May 2022 10:05:39 GMT</pubDate>
<description><![CDATA[<pre><code>➤ YN0000: └ Completed in 0s 488ms
➤ YN0000: ┌ Fetch step
➤ YN0013: │ ethereumjs-abi@https://github.com/ethereumjs/ethereumjs-abi.git#commit=ee3994657fa7a427238e6ba92a84d0b529bbcde0 ca
➤ YN0013: │ ethereumjs-abi@https://github.com/ethereumjs/ethereumjs-abi.git#commit=ee3994657fa7a427238e6ba92a84d0b529bbcde0 ca
➤ YN0018: │ ethereumjs-abi@https://github.com/ethereumjs/ethereumjs-abi.git#commit=ee3994657fa7a427238e6ba92a84d0b529bbcde0: The remote archive doesn't match the expected checksum
➤ YN0000: └ Completed in 6s 167ms
➤ YN0000: Failed with errors in 6s 661ms
</code></pre>
<ul>
<li><a href="https://yarnpkg.com/advanced/error-codes#yn0018---cache_checksum_mismatch">https://yarnpkg.com/advanced/error-codes#yn0018---cache_checksum_mismatch</a></li>
<li><a href="https://github.com/yarnpkg/berry/issues/1142#issuecomment-607272809">https://github.com/yarnpkg/berry/issues/1142#issuecomment-607272809</a></li>
</ul>
<pre><code>yarn cache clean --all
YARN_CHECKSUM_BEHAVIOR=update yarn
</code></pre>
<h3>Github Actions</h3>
<ul>
<li><a href="https://yarnpkg.com/cli/install">https://yarnpkg.com/cli/install</a></li>
<li><a href="https://classic.yarnpkg.com/lang/en/docs/cli/install/">https://classic.yarnpkg.com/lang/en/docs/cli/install/</a></li>
<li><a href="https://stackoverflow.com/questions/58482655/what-is-the-closest-to-npm-ci-in-yarn">https://stackoverflow.com/questions/58482655/what-is-the-closest-to-npm-ci-in-yarn</a></li>
<li><a href="https://yarnpkg.com/getting-started/migration#step-by-step">https://yarnpkg.com/getting-started/migration#step-by-step</a></li>
<li><a href="https://github.com/actions/setup-node/pull/495">https://github.com/actions/setup-node/pull/495</a></li>
<li><a href="https://stackoverflow.com/questions/52630404/how-to-install-packages-based-on-the-lock-file-with-yarn">https://stackoverflow.com/questions/52630404/how-to-install-packages-based-on-the-lock-file-with-yarn</a>
<code>YN0050: The --frozen-lockfile option is deprecated; use --immutable and/or --immutable-cache instead</code></li>
</ul>
<pre><code class="language-yml">steps:
- uses: actions/checkout@v3
- uses: actions/setup-node@v3
with:
node-version: '14'
cache: 'yarn'
- run: yarn install --frozen-lockfile
- run: yarn test
</code></pre>
<pre><code class="language-yml"> - run: yarn install --immutable
</code></pre>
<h3>npm/yarn scripts 使用指南</h3>
<ul>
<li><a href="https://www.ruanyifeng.com/blog/2016/10/npm_scripts.html">npm scripts 使用指南</a></li>
<li><a href="https://yarnpkg.com/advanced/lifecycle-scripts">https://yarnpkg.com/advanced/lifecycle-scripts</a></li>
</ul>
]]></description>
</item>
<item>
<title><![CDATA[Animation case]]></title>
<link>https://github.com/xiaotiandada/blog/issues/104</link>
<guid>https://github.com/xiaotiandada/blog/issues/104</guid>
<pubDate>Thu, 28 Apr 2022 10:45:24 GMT</pubDate>
<description><![CDATA[<ul>
<li><a href="https://codesandbox.io/s/swap-swap-rotate-bieux9">swap swap-rotate</a></li>
<li><a href="https://codesandbox.io/s/logo-showcase-l9t8e7?file=/src/App.tsx">logo-showcase</a></li>
<li><a href="https://codesandbox.io/s/showcase-g9j1j2">showcase</a></li>
</ul>
]]></description>
</item>
<item>
<title><![CDATA[iPhoneX 安全区域]]></title>
<link>https://github.com/xiaotiandada/blog/issues/103</link>
<guid>https://github.com/xiaotiandada/blog/issues/103</guid>
<pubDate>Wed, 27 Apr 2022 09:01:33 GMT</pubDate>
<description><![CDATA[<ul>
<li><a href="https://segmentfault.com/a/1190000022191869">https://segmentfault.com/a/1190000022191869</a></li>
<li><a href="https://www.shouxicto.com/article/1558.html">https://www.shouxicto.com/article/1558.html</a></li>
<li><a href="https://www.zcool.com.cn/article/ZNTU1MTUy.html">https://www.zcool.com.cn/article/ZNTU1MTUy.html</a></li>
</ul>
<pre><code class="language-css">padding-bottom: constant(safe-area-inset-bottom); /*兼容 IOS<11.2*/
padding-bottom: env(safe-area-inset-bottom); /*兼容 IOS>11.2*/
</code></pre>
<p>今天又写到了底部导航，顺带记录一下吧。</p>
]]></description>
</item>
<item>
<title><![CDATA[为什么a标签中使用img后的高度多了几个像素？]]></title>
<link>https://github.com/xiaotiandada/blog/issues/102</link>
<guid>https://github.com/xiaotiandada/blog/issues/102</guid>
<pubDate>Tue, 26 Apr 2022 12:13:46 GMT</pubDate>
<description><![CDATA[<ul>
<li><a href="https://www.zhihu.com/question/26821863">https://www.zhihu.com/question/26821863</a></li>
<li><a href="https://segmentfault.com/q/1010000008659208/a-1020000008659599">https://segmentfault.com/q/1010000008659208/a-1020000008659599</a></li>
<li><a href="https://codeantenna.com/a/kOggMTb8Y0">https://codeantenna.com/a/kOggMTb8Y0</a></li>
</ul>
<p>部分安卓机器 img 没有设置高度，会使用默认长度拉伸。</p>
]]></description>
</item>
<item>
<title><![CDATA[PixiJS]]></title>
<link>https://github.com/xiaotiandada/blog/issues/101</link>
<guid>https://github.com/xiaotiandada/blog/issues/101</guid>
<pubDate>Tue, 26 Apr 2022 05:10:19 GMT</pubDate>
<description><![CDATA[<ul>
<li><a href="https://pixijs.com/">https://pixijs.com/</a></li>
<li><a href="https://reactpixi.org/">https://reactpixi.org/</a></li>
</ul>
<p>一些 Graphics、Sprite，React-Spring 使用。拖动 点击 填充素材等 。</p>
<p>之前项目 SVG 绘制的由于 DOM 太多导致体验不太好。</p>
<p><a href="https://github.com/xiaotiandada/hexagon">https://github.com/xiaotiandada/hexagon</a></p>
]]></description>
</item>
<item>
<title><![CDATA[Next]]></title>
<link>https://github.com/xiaotiandada/blog/issues/100</link>
<guid>https://github.com/xiaotiandada/blog/issues/100</guid>
<pubDate>Fri, 24 Jun 2022 03:27:36 GMT</pubDate>
<description><![CDATA[<ul>
<li><a href="https://nextjs.org/learn/foundations/about-nextjs">https://nextjs.org/learn/foundations/about-nextjs</a></li>
</ul>
<h3>next/image</h3>
<ul>
<li><a href="https://nextjs.org/docs/messages/sharp-missing-in-production">https://nextjs.org/docs/messages/sharp-missing-in-production</a></li>
<li><a href="https://www.npmjs.com/package/sharp">https://www.npmjs.com/package/sharp</a></li>
<li><a href="https://www.npmjs.com/package/@squoosh/lib">https://www.npmjs.com/package/@squoosh/lib</a></li>
</ul>
<h3>SEO</h3>
<ul>
<li><a href="https://nextjs.org/learn/seo/introduction-to-seo">https://nextjs.org/learn/seo/introduction-to-seo</a> （TODO）</li>
<li><a href="https://github.com/garmeeh/next-seo">https://github.com/garmeeh/next-seo</a></li>
<li><a href="https://nextjs.org/docs/advanced-features/measuring-performance">https://nextjs.org/docs/advanced-features/measuring-performance</a></li>
</ul>
<p>next-seo images 参数是一个数组，大部分情况都是使用最后一张作为封面。如果需要特定图片作为封面可只设置一张。</p>
<ul>
<li><a href="https://github.com/xiaotiandada/blog/issues/107">https://github.com/xiaotiandada/blog/issues/107</a> seo 部分可以参考</li>
</ul>
<h3>PWA</h3>
<ul>
<li><a href="https://github.com/shadowwalker/next-pwa">https://github.com/shadowwalker/next-pwa</a></li>
<li><a href="https://lavas-project.github.io/pwa-book/chapter06/1-manifest-json.html">https://lavas-project.github.io/pwa-book/chapter06/1-manifest-json.html</a></li>
<li><a href="https://developer.mozilla.org/zh-CN/docs/Web/Progressive_web_apps/Add_to_home_screen">https://developer.mozilla.org/zh-CN/docs/Web/Progressive_web_apps/Add_to_home_screen</a></li>
</ul>
<blockquote>
<p>Tip: Put the viewport head meta tag into _app.js rather than in _document.js if you need it.</p>
</blockquote>
<ul>
<li><a href="https://github.com/shadowwalker/next-pwa/issues/99">https://github.com/shadowwalker/next-pwa/issues/99</a></li>
</ul>
<h3>Layout</h3>
<ul>
<li><a href="https://nextjs.org/docs/basic-features/layouts">https://nextjs.org/docs/basic-features/layouts</a></li>
<li><a href="https://github.com/vercel/next.js/tree/canary/examples/layout-component">https://github.com/vercel/next.js/tree/canary/examples/layout-component</a></li>
<li><a href="https://adamwathan.me/2019/10/17/persistent-layout-patterns-in-nextjs/">https://adamwathan.me/2019/10/17/persistent-layout-patterns-in-nextjs/</a></li>
</ul>
<h3>Vercel</h3>
<p>λ (Server) server-side renders at runtime (uses getInitialProps or getServerSideProps)
○ (Static) automatically rendered as static HTML (uses no initial props)
● (SSG) automatically generated as static HTML + JSON (uses getStaticProps)</p>
<blockquote>
<p>Error: No more than 12 Serverless Functions can be added to a Deployment on the Hobby plan. Create a team (Pro plan) to deploy more. Learn More: <a href="https://vercel.link/function-count-limit">https://vercel.link/function-count-limit</a></p>
</blockquote>
<p><a href="https://cant-xt.vercel.app/docs/folder-structure/next">https://cant-xt.vercel.app/docs/folder-structure/next</a> 一些 serverless limit 规则</p>
<h3>Header</h3>
<h4>SharedArrayBuffer</h4>
<ul>
<li><a href="https://nextjs.org/docs/advanced-features/security-headers">https://nextjs.org/docs/advanced-features/security-headers</a></li>
</ul>
<p>嵌入 iframe 需要支持 <code>SharedArrayBuffer</code>, 父级需要定义 header. 一些相关记录</p>
<p>#111
#112
#113</p>
<pre><code class="language-js">[
{
key: 'Cross-Origin-Embedder-Policy',
value: 'require-corp',
},
{
key: 'Cross-Origin-Opener-Policy',
value: 'same-origin',
},
]
</code></pre>
<p>iframe 源也开启了会被拒绝链接</p>
<img width="1388" alt="image" src="https://user-images.githubusercontent.com/24250627/172151602-4adaaf23-49c2-410c-bb2e-43b887e68371.png">
<h3>页面</h3>
<img width="612" alt="image" src="https://user-images.githubusercontent.com/24250627/173767739-048b3ce2-7ae8-4f3e-8b98-72aa2beb9877.png">
<p>第一次进入页面会 <code>SSG</code> 渲染页面。但是只在 /game 页面下定义了 header 参数，故首页无参数。</p>
<pre><code>[.
{
source: '/game/:path*',
headers: COEPHeaders,
},
{
source: '/zh-CN/game/:path*',
headers: COEPHeaders,
}
]
</code></pre>
<ul>
<li>如果直接从 /game 路由下进入响应 header</li>
<li>如果从首页/其他页面 进入 /game 路由则不会响应 header</li>
<li>切换页面返回数据 应该是客户端渲染 <code>CSR</code> <a href="https://juejin.cn/post/6925308376976982029">https://juejin.cn/post/6925308376976982029</a>
<ul>
<li><code>/_next/static/chunks/pages/game/%5Bid%5D.js</code> <code>Content-Type: application/javascript; charset=UTF-8</code></li>
<li><code>/_next/data/development/en-US/game/177.json?id=177</code> <code>Content-Type: application/json</code></li>
</ul>
</li>
</ul>
<img width="611" alt="image" src="https://user-images.githubusercontent.com/24250627/173768975-0b53bf95-83bb-42ed-8abd-e4fd22eb3692.png">
<img width="716" alt="image" src="https://user-images.githubusercontent.com/24250627/173769773-b1ba3f05-62d4-4cd9-8e62-172d03ea17b4.png">
<img width="714" alt="image" src="https://user-images.githubusercontent.com/24250627/173769801-8ad794f0-45a6-4402-b233-494fc08886f9.png">
<h2>getStaticProps</h2>
<p><a href="https://nextjs.org/docs/api-reference/data-fetching/get-static-props">https://nextjs.org/docs/api-reference/data-fetching/get-static-props</a></p>
<p>getStaticProps context locale 参数，默认定义为 <code>locale?: string</code>。大概看了一下源码的定义</p>
<p><a href="https://github.com/vercel/next.js/blob/39302141b5ea3a1e9a55af906129a44675337cf9/packages/next/export/index.ts#L375">https://github.com/vercel/next.js/blob/39302141b5ea3a1e9a55af906129a44675337cf9/packages/next/export/index.ts#L375</a></p>
<pre><code class="language-ts">locales: i18n?.locales,
locale: i18n?.defaultLocale,
defaultLocale: i18n?.defaultLocale,
domainLocales: i18n?.domains,
</code></pre>
<p>猜测应该是这里处理的。因为我们定义了 i18n config，locale 使用了 <code>i18n?.defaultLocale</code> 配置。然后会根据 cookie 或 url 路径处理好当前语言环境。</p>
<p>可能返回 <code>en-US | zh-CN</code></p>
<p>可以修改类型消除错误 <code>...(await serverSideTranslations(ctx.locale as string, ['common'])),</code></p>
<h3>webassembly</h3>
<p><a href="https://github.com/vercel/next.js/issues/25852">https://github.com/vercel/next.js/issues/25852</a></p>
<h3>Jest</h3>
<ul>
<li><a href="https://github.com/xiaotiandada/blog/issues/114">https://github.com/xiaotiandada/blog/issues/114</a></li>
</ul>
]]></description>
</item>
<item>
<title><![CDATA[Nest]]></title>
<link>https://github.com/xiaotiandada/blog/issues/99</link>
<guid>https://github.com/xiaotiandada/blog/issues/99</guid>
<pubDate>Tue, 21 Jun 2022 10:36:53 GMT</pubDate>
<description><![CDATA[<h2>class-validator</h2>
<ul>
<li><a href="https://juejin.cn/post/7083505497021612068">class-validator 校验器的使用</a></li>
</ul>
<h2>ValidationPipe</h2>
<blockquote>
<p><a href="https://docs.nestjs.com/techniques/validation#stripping-properties">https://docs.nestjs.com/techniques/validation#stripping-properties</a>
<a href="http://static.kancloud.cn/juukee/nestjs/2675355">http://static.kancloud.cn/juukee/nestjs/2675355</a>
<a href="https://juejin.cn/post/7064595876680826910">https://juejin.cn/post/7064595876680826910</a></p>
</blockquote>
<h3>transform</h3>
<pre><code class="language-ts">app.useGlobalPipes(
new ValidationPipe({
transform: true,
}),
);
</code></pre>
<pre><code class="language-ts">@Get(':id')
findOne(@Param('id') id: number) {
console.log(typeof id === 'number'); // true
return 'This action returns a user';
}
</code></pre>
<p>id 会自动从 string 转换成 number</p>
<h3>whitelist</h3>
<pre><code class="language-ts">app.useGlobalPipes(
new ValidationPipe({
whitelist: true,
}),
);
</code></pre>
<p>true 时，自动删除非白名单属性(在验证类中没有任何修饰符的属性)。</p>
<pre><code class="language-ts">// Bad
// 所有参数都将被过滤
export class CreateCatDto {
public name: string;
public age: number;
public breed: string;
}
// Good
import { IsNumber, IsString } from 'class-validator';
export class CreateCatDto {
@IsString()
public name: string;
@IsNumber()
public age: number;
@IsString()
public breed: string;
}
</code></pre>
<h3>typeorm</h3>
<pre><code class="language-bash"> "typeorm": "^0.3.6",
"typeorm": "0.2.45",
</code></pre>
<p>0.3.x 按照文档无法工作
0.2.x 按照文档正常工作</p>
<ul>
<li><a href="https://blog.csdn.net/qq_27868061/article/details/79315985">typeorm删除之remove与delete</a></li>
</ul>
]]></description>
</item>
<item>
<title><![CDATA[Keyboard API]]></title>
<link>https://github.com/xiaotiandada/blog/issues/98</link>
<guid>https://github.com/xiaotiandada/blog/issues/98</guid>
<pubDate>Mon, 11 Apr 2022 16:34:09 GMT</pubDate>
<description><![CDATA[<ul>
<li><a href="https://developer.mozilla.org/en-US/docs/Web/API/Keyboard/lock">https://developer.mozilla.org/en-US/docs/Web/API/Keyboard/lock</a></li>
</ul>
]]></description>
</item>
<item>
<title><![CDATA[Fullscreen API]]></title>
<link>https://github.com/xiaotiandada/blog/issues/97</link>
<guid>https://github.com/xiaotiandada/blog/issues/97</guid>
<pubDate>Fri, 22 Apr 2022 11:18:18 GMT</pubDate>
<description><![CDATA[<ul>
<li><a href="https://developer.mozilla.org/en-US/docs/Web/API/Fullscreen_API">https://developer.mozilla.org/en-US/docs/Web/API/Fullscreen_API</a></li>
<li><a href="https://github.com/rafgraph/fscreen/blob/main/src/fscreen.js">https://github.com/rafgraph/fscreen/blob/main/src/fscreen.js</a></li>
<li><a href="https://web.dev/native-hardware-fullscreen/#let-the-user-choose-when-to-go-fullscreen">https://web.dev/native-hardware-fullscreen/#let-the-user-choose-when-to-go-fullscreen</a></li>
</ul>
<p>全屏 IOS 不支持，可以通过 CSS Fixed + PWA 实现比较好的体验</p>
]]></description>
</item>
<item>
<title><![CDATA[React]]></title>
<link>https://github.com/xiaotiandada/blog/issues/96</link>
<guid>https://github.com/xiaotiandada/blog/issues/96</guid>
<pubDate>Wed, 29 Jun 2022 04:06:46 GMT</pubDate>
<description><![CDATA[<h2>useEffect 在组件挂载时运行两次（StrictMode，NODE_ENV=development）</h2>
<pre><code>...
在严格模式下使用 React 18，`useEffect() that should run only on the initial mount, runs twice!`
...
---
...
React 18 为严格模式引入了一个新的仅限开发的检查。每当第一次安装组件时，此新检查将自动卸载并重新安装每个组件，并在第二次安装时恢复先前的状态。
...
</code></pre>
<h3>Before this change</h3>
<pre><code>* React mounts the component.
* Layout effects are created.
* Effect effects are created.
</code></pre>
<h3>With Strict Mode in React 18</h3>
<pre><code>* React mounts the component.
* Layout effects are created.
* Effect effects are created.
* React simulates unmounting the component.
* Layout effects are destroyed.
* Effects are destroyed.
* React simulates mounting the component with the previous state.
* Layout effect setup code runs
* Effect setup code runs
</code></pre>
<p>-<a href="https://github.com/facebook/react/issues/24502">https://github.com/facebook/react/issues/24502</a>
-<a href="https://reactjs.org/blog/2022/03/08/react-18-upgrade-guide.html#updates-to-strict-mode">https://reactjs.org/blog/2022/03/08/react-18-upgrade-guide.html#updates-to-strict-mode</a>
-<a href="https://levelup.gitconnected.com/react-18-the-trickiness-of-useeffect-fadfa65fa4b4">https://levelup.gitconnected.com/react-18-the-trickiness-of-useeffect-fadfa65fa4b4</a>
-<a href="https://stackoverflow.com/questions/72238175/react-18-useeffect-is-getting-called-two-times-on-mount">https://stackoverflow.com/questions/72238175/react-18-useeffect-is-getting-called-two-times-on-mount</a></p>
<h2>源码</h2>
<p>介绍全新的 JSX 转换 v17.0 RC</p>
<p><a href="https://zh-hans.reactjs.org/blog/2020/08/10/react-v17-rc.html">https://zh-hans.reactjs.org/blog/2020/08/10/react-v17-rc.html</a>
<a href="https://reactjs.org/blog/2020/09/22/introducing-the-new-jsx-transform.html">https://reactjs.org/blog/2020/09/22/introducing-the-new-jsx-transform.html</a></p>
<p>旧的 JSX 转换将 JSX 转换为React.createElement(...)调用，
新的 JSX 转换不是将 JSX 转换为React.createElement，而是自动从 React 包中的这些新入口点导入特殊函数并调用它们。</p>
<pre><code class="language-tsx">// Inserted by a compiler (don't import it yourself!)
import {jsx as _jsx} from 'react/jsx-runtime';
function App() {
return _jsx('h1', { children: 'Hello world' });
}
</code></pre>
<pre><code class="language-tsx"><h1 id="title" key="title" style={{ width: 100 }} onClick={() => console.log('onClick')}>hello<span data="d">12313</span></h1>
</code></pre>
<pre><code class="language-js">"use strict";
/*#__PURE__*/
React.createElement("h1", {
id: "title",
key: "title",
style: {
width: 100
},
onClick: () => console.log('onClick')
}, "hello", /*#__PURE__*/React.createElement("span", {
data: "d"
}, "12313"));
</code></pre>
<ul>
<li><a href="https://astexplorer.net/">https://astexplorer.net/</a></li>
<li><a href="https://babeljs.io">https://babeljs.io</a></li>
</ul>
<pre><code class="language-js">export const REACT_ELEMENT_TYPE = Symbol.for("react.element");
import { REACT_ELEMENT_TYPE } from "./shared/ReactSymbols";
const RESERVED_PROPS = {
key: true,
ref: true,
__self: true,
__source: true,
};
/**
* Factory method to create a new React element. This no longer adheres to
* the class pattern, so do not use new to call it. Also, instanceof check
* will not work. Instead test $$typeof field against Symbol.for('react.element') to check
* if something is a React Element.
*
* @param {*} type
* @param {*} props
* @param {*} key
* @param {string|object} ref
* @param {*} owner
* @param {*} self A *temporary* helper to detect places where `this` is
* different from the `owner` when React.createElement is called, so that we
* can warn. We want to get rid of owner and replace string `ref`s with arrow
* functions, and as long as `this` and owner are the same, there will be no
* change in behavior.
* @param {*} source An annotation object (added by a transpiler or otherwise)
* indicating filename, line number, and/or other information.
* @internal
*/
const ReactElement = function (type, key, ref, self, source, owner, props) {
const element = {
// This tag allows us to uniquely identify this as a React Element
$$typeof: REACT_ELEMENT_TYPE,
// Built-in properties that belong on the element
type: type,
key: key,
ref: ref,
props: props,
// Record the component responsible for creating this element.
_owner: owner,
_store: {},
_self: self,
_source: source,
};
return element;
};
export function createElement(type, config, children) {
// Reserved names are extracted
const props = {};
let key = null;
let ref = null;
let self = null;
let source = null;
if (config != null) {
key = "" + config.key;
self = config.__self === undefined ? null : config.__self;
source = config.__source === undefined ? null : config.__source;
// Remaining properties are added to a new props object
for (const proName in config) {
if (
Object.hasOwnProperty.call(config, proName) &&
!RESERVED_PROPS.hasOwnProperty(proName)
) {
props[proName] = config[proName];
}
}
}
// Children can be more than one argument, and those are transferred onto
// the newly allocated props object.
const childrenLength = arguments.length - 2;
if (childrenLength === 1) {
props.children = children;
} else if (childrenLength > 1) {
const childArray = Array(childrenLength);
for (let i = 0; i < childArray.length; i++) {
childArray[i] = arguments[i + 2];
}
props.children = childArray;
}
const _owner = null;
return ReactElement(type, key, ref, self, source, _owner, props);
}
</code></pre>
<pre><code class="language-js">const emptyObject = {};
/**
* Base class helpers for the updating state of a component.
*/
export function Component(props) {
this.props = props;
this.refs = emptyObject;
}
Component.prototype.isReactComponent = {};
</code></pre>
<pre><code class="language-jsx">class PureComponents extends React.Component {
shouldComponentUpdate(nextProps, nextState) {
console.log("nextProps", nextProps, nextState);
return (
shallowEqual(nextProps, this.props) && shallowEqual(nextState, this.state)
);
}
}
function shallowEqual(object1, object2) {
if (object1 === object2) {
return true;
}
if (
typeof object1 !== "object" ||
object1 === null ||
object2 !== "object" ||
object2 === null
) {
return false;
}
const keys1 = Object.keys(object1);
const keys2 = Object.keys(object2);
if (keys1.length !== keys2.length) {
return false;
}
for (let i = 0; i < keys1.length; i++) {
if (
!hasOwnProperty.call(object2, keys1[i]) ||
object1[keys1[i]] !== object2[keys1[i]]
) {
return false;
}
}
return true;
}
</code></pre>
<h3>React16废弃了哪些生命周期？为什么？</h3>
<ul>
<li><a href="https://blog.csdn.net/weixin_43392489/article/details/121438376">https://blog.csdn.net/weixin_43392489/article/details/121438376</a></li>
</ul>
<p>React16废弃的生命周期有3个will：
componentWillMount
componentWillReceiveProps
componentWillUpdate</p>
<h2>v16.13.1</h2>
<h3>createElement</h3>
<pre><code class="language-tsx">import { REACT_ELEMENT_TYPE } from '../../shared/ReactSymbols';
const hasOwnProperty = Object.prototype.hasOwnProperty;
const RESERVED_PROPS = {
key: true,
ref: true,
__self: true,
__source: true,
};
/**
* Create and return a new ReactElement of the given type.
* See https://reactjs.org/docs/react-api.html#createelement
*/
export function createElement(type: any, config: any, children: any) {
/**
* propName -> 属性名称