需求：
1. 在作业1.html代码的基础上，引入vue.js文件，并实例化vm对象，绑定#goods元素
2. 在作业1.html代码的基础上，默认中间弹出窗口隐藏起来，当用户点击"添加商品"，显示弹出窗口
3. 在作业1.html代码的基础上，当用户点击弹出窗口的"保存"或者"取消"按钮时，隐藏弹出窗
4. 在作业2.html代码的基础上，把以下数据全部通过vue显示到页面中。
goods_list:[
{"name":"python入门","num":27,"price":150},
{"name":"python进阶","num":27,"price":100},
{"name":"python高级","num":27,"price":75},
{"name":"python研究","num":27,"price":60},
{"name":"python放弃","num":27,"price":110},
]
5. 在作业2.html代码的基础上，实现数据隔行换色效果，奇数行背景为#aaaaff，偶数行背景为#ffaaaa
作业1：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<script src="vue.js"></script>
<style>
#goods table{
600px;
border:1px solid #000;
border-collapse: collapse;
}
#goods td,#goods th{
border: 1px solid #000;
}
#goods .box{
position: fixed;
top: 0;
left: 0;
right: 0;
bottom: 0;
margin: auto;
background-color: #eee;
280px;
height: 160px;
padding: 40px 80px;
}
.display{
display: none;
}
</style>
</head>
<body>
<div id="goods">
<button @click="type=false">添加商品</button>
<table>
<tr>
<th>商品id</th>
<th>商品标题</th>
<th>商品数量</th>
<th>商品价格</th>
<th>操作</th>
</tr>
<tr>
<td>12</td>
<td>python入门</td>
<td>
<button>-</button>
<input type="text" size="2">
<button>+</button>
</td>
<td>15.5</td>
<td>
<button>编辑</button>
<button>删除</button>
</td>
</tr>
<tr>
<td colspan="5">总计： 1000元</td>
</tr>
</table>
<div :class="{box:true,display:type}">
商品标题: <input type="text"><br><br>
商品数量: <input type="text"><br><br>
商品价格: <input type="text"><br><br>
<button>保存</button>
<button @click="type=true">取消</button>
</div>
</div>
<script>
let vm = new Vue({
el:'#goods',
data:{
type:true
},
})
</script>
</body>
</html>
作业2：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<script src="vue.js"></script>
<style>
#goods table{
600px;
border:1px solid #000;
border-collapse: collapse;
}
#goods td,#goods th{
border: 1px solid #000;
}
</style>
</head>
<body>
<div id="goods">
<table>
<tr>
<th>商品序号</th>
<th>商品标题</th>
<th>商品数量</th>
<th>商品价格</th>
</tr>
<tr v-for="(good,index) in goods_list"
bgcolor="index%2==0?'#aaaaff':'#ffffaa'">
<td>{{index+1}}</td>
<td>{{good.name}}</td>
<td>{{good.num}}</td>
<td>{{good.price}}</td>
</tr>
</table>
</div>
<script>
let vm = new Vue({
el:'#goods',
data:{
goods_list:[
{'name':'python入门','num':27,'price':150},
{'name':'python进阶','num':27,'price':100},
{'name':'python高级','num':27,'price':75},
{'name':'python研究','num':27,'price':60},
{'name':'python放弃','num':27,'price':110},
]
}
})
</script>
</body>
</html>