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JS-库函数传入-undefined-参数的意图和作用.html
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<section id="main" style="float:none;"><article id="post-JS-库函数传入-undefined-参数的意图和作用" style="width: 75%; float:left;" class="article article-type-post article-home-false" itemscope itemprop="blogPost" >
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JS 库函数传入 undefined 参数的意图和作用
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<a href="/JS-库函数传入-undefined-参数的意图和作用.html" class="article-date">
<time datetime="2017-04-13T05:29:30.000Z" itemprop="datePublished">2017-04-13</time>
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<a class="article-category-link" href="/categories/烂笔头/">烂笔头</a>
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<span class="post-count">本文共 890 字</span>
<span class="post-count">预计花费 4 分钟</span>
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<div class="article-entry" itemprop="articleBody">
<blockquote>
<p>  最近了解 ES6 的箭头函数时无意间扯出了一连串的问题。首先碰到了 bind() 函数，先前只了解call() 和 apply() 不曾注意到 bind(),于是视线暂时转移到 bind()。<br>  当搜索 MDN 时发现 bind() 根据参数个数的不同分为不同的功能，其中手册中的例子在演示传入两个参数时第一个参数传入 undefined 这让我想起来了在 jQuery 框架中也曾经见到这样的做法但一直懒惰不去仔细了解，于是这个问题链的终点就停在此，我将以“递归”的方式从前往后发现问题，从后往前解决问题。</p>
</blockquote>
<a id="more"></a>
<h3 id="jQuery-为什么将-undefined-当作参数传入？"><a href="#jQuery-为什么将-undefined-当作参数传入？" class="headerlink" title="jQuery 为什么将 undefined 当作参数传入？"></a>jQuery 为什么将 undefined 当作参数传入？</h3><blockquote>
<p>  防止 window.undefined 被重写，由于 undefined 不是 JS 的保留字，所以存在开发者在全局作用域声明一个名为 undefined 的变量并赋值的情况。当开发者自己编写的函数内部用到了 window.undefined 在寻找时追溯到顶层作用域而此时发现已被重写，就会导致意外发生。值得注意的是这个问题只存在于一些老的浏览器，当时的规则 undefined 是可以被重写的。而当 ES 5 出台后规定全局作用域中的 window.undefined 是不能被写的，而函数作用域的依旧可以。</p>
</blockquote>
<p>jQuery 为了兼容旧浏览器的做法</p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">(<span class="function"><span class="keyword">function</span>(<span class="params">window,undefined</span>)</span>{</span><br><span class="line"> <span class="comment">// xxx</span></span><br><span class="line">})(<span class="built_in">window</span>)</span><br></pre></td></tr></table></figure>
<p>这种解决方案的关键点在于<code>设定 undefined 形参，但不传入对应的实参。这样可以保证将 window.undefined 传入函数内部。</code>。<br>这里有个知识点：<strong>JS 中缺省的参数，默认传递 undefined</strong>。<br>当函数内部需要用到 undefined 时会先在内部作用域查找，而此时 undefined 已被传递进来并且是被赋为 window.undefined ，所以就停止了向上查找，排除了 window.undefined 被重写造成的影响。<br><code>这种情况只存在于老旧浏览器, window.undefined 可被重写的 bug 。随着时间的发展，这种写法已不再使用，因为没有必要再兼容老旧浏览器</code></p>
<h3 id="bind-函数：两套参数，两种功能"><a href="#bind-函数：两套参数，两种功能" class="headerlink" title="bind() 函数：两套参数，两种功能"></a>bind() 函数：两套参数，两种功能</h3><blockquote>
<p>  bind()方法会<strong>创建一个新函数</strong>。当这个新函数被调用时，bind()的*第一个参数将作为它运行时的 <strong>this</strong>, 之后的一序列参数将会在传递的实参前传入作为它的参数。 引自 <a href="https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Global_Objects/Function/bind" target="_blank" rel="noopener">MDN</a></p>
</blockquote>
<h4 id="一个参数：创建一个函数，使这个函数不论怎么调用都有同样的-this-值。"><a href="#一个参数：创建一个函数，使这个函数不论怎么调用都有同样的-this-值。" class="headerlink" title="一个参数：创建一个函数，使这个函数不论怎么调用都有同样的 this 值。"></a>一个参数：创建一个函数，使这个函数不论怎么调用都有同样的 this 值。</h4><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">this</span>.x = <span class="number">9</span>;</span><br><span class="line"><span class="keyword">var</span> <span class="built_in">module</span> = {</span><br><span class="line"> x: <span class="number">81</span>,</span><br><span class="line"> getX: <span class="function"><span class="keyword">function</span>(<span class="params"></span>) </span>{</span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">this</span>.x</span><br><span class="line"> }</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"><span class="built_in">module</span>.getX()</span><br><span class="line"><span class="keyword">var</span> retrieveX = <span class="built_in">module</span>.getX <span class="comment">// retrieveX 拿到 getX 指针</span></span><br><span class="line">retrieveX() <span class="comment">// 等价于 window.retrieveX 结果为 9</span></span><br><span class="line"></span><br><span class="line"><span class="comment">// bind() 登场</span></span><br><span class="line"></span><br><span class="line"><span class="keyword">var</span> boundGetX = retrieveX.bind(<span class="built_in">module</span>) <span class="comment">// 此处的 module 就是永久绑定到的 this, 注意他会返回一个新的函数</span></span><br><span class="line">boundGetX() <span class="comment">//81</span></span><br></pre></td></tr></table></figure>
<h4 id="两个参数：使一个函数拥有预设的初始参数"><a href="#两个参数：使一个函数拥有预设的初始参数" class="headerlink" title="两个参数：使一个函数拥有预设的初始参数"></a>两个参数：使一个函数拥有预设的初始参数</h4><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">function</span> <span class="title">list</span>(<span class="params"></span>) </span>{</span><br><span class="line"> <span class="keyword">return</span> <span class="built_in">Array</span>.prototype.slice.call(<span class="built_in">arguments</span>);</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"><span class="keyword">var</span> list1 = list(<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>); <span class="comment">// [1, 2, 3]</span></span><br><span class="line"></span><br><span class="line"><span class="comment">// Create a function with a preset leading argument</span></span><br><span class="line"><span class="keyword">var</span> leadingThirtysevenList = list.bind(<span class="literal">undefined</span>, <span class="number">37</span>);</span><br><span class="line"></span><br><span class="line"><span class="keyword">var</span> list2 = leadingThirtysevenList(); <span class="comment">// [37]</span></span><br><span class="line"><span class="keyword">var</span> list3 = leadingThirtysevenList(<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>); <span class="comment">// [37, 1, 2, 3]</span></span><br></pre></td></tr></table></figure>
<p><a href="https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Global_Objects/Function/bind" target="_blank" rel="noopener">bind() 的详细讲解</a></p>
<h4 id="手写-bind"><a href="#手写-bind" class="headerlink" title="手写 bind()"></a>手写 <code>bind()</code></h4><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">function</span> <span class="title">bind</span>(<span class="params">fn, context</span>)</span>{</span><br><span class="line"> <span class="keyword">return</span> <span class="function"><span class="keyword">function</span> (<span class="params"></span>)</span>{</span><br><span class="line"> <span class="keyword">return</span> fn.apply(context, <span class="built_in">arguments</span>);</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<p>上述代码包含两个知识点：</p>
<ol>
<li>Array.prototype.slice.call(arguments) 可以将一个具有 length 属性的对象转化为数组</li>
<li>当需要传的实参数量少于形参的数量时，可以用 undefined 占位。</li>
</ol>
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