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cal.html
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cal.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script src="https://cdn.bootcss.com/vue/2.2.2/vue.min.js"></script>
</head>
<style>
*{
margin:0;
padding:0;
}
div {
width:400px;
background: pink;
margin:50px auto; /* make it in the center*/
padding:40px 80px;/* 40 means top and bottom ,while 80 means left and right*/
}
body{
font-family:Microsoft YaHei;
}
span {
float:right;
}
ul {
font-size:40px;
}
li {
list-style-type: none;
}
ul li {
margin-top:5px;
margin-right:35px;
background:palegreen;
}
ul li.active{
background-color:yellow;
}
p {
font-size:40px;
margin:10px 35px;
background: pink;
}
</style>
<div id="main" v-cloak>
<ul>
<li v-for="item in items" v-on:click="toggleActive(item)" v-bind:class="{'active':item.active}">
<!--v-bind的意思是说如果item.active是true，那么li就有<class="active">这个属性，否则就没有。这个是根据data中的
值来决定的。
v-on 依据点击，点击了就调用toggleActive(item)函数，这个函数改变active的属性，如果active是false，
就改成true，如果是true，就改成false。
-->
{{item.name}}<span>{{item.price}}</span></li>
</ul>
<p>Total:<span>{{total()}}</span></p>
</div>
<script>
var demo=new Vue({
el:'#main',
data:{
items:[{
name:'baicai',
price:200,
active:true,
},
{
name:'doujiao',
price:300,
active:false,
},
{name:'tudou',
price:220,
active:false,}]
},//, is necessary
methods:{
toggleActive: function(i){
i.active = !i.active;
},
// change active value， i是形参。
total:function(){
var total=0;
this.items.forEach(function(s){
if (s.active){
total+=s.price;
}
})//forEach over at here
return total;
}//total over at here
}//methods over at here
})//vue over at here
</script>