<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<script src="https://cdn.bootcdn.net/ajax/libs/jquery/3.6.1/jquery.js"></script>
<link rel="stylesheet" href="bootstrap-3.4.1-dist/css/bootstrap.min.css">
<script src="bootstrap-3.4.1-dist/js/bootstrap.min.js"></script>
<script src="js/vue.js"></script>
</head>
<body>
<div id="app">
<div class="container-fluid">
<div class="col-md-6 col-md-offset-3">
<table class="table table-hover">
<thead>
<tr>
<th>id</th>
<th>商品名</th>
<th>价格</th>
<th>数量</th>
<!--绑定一个change事件，对应一个双向数据 checkall为false,事件内判断如果不为false 那么就全选-->
<th>全选 <input type="checkbox" v-model="checkall" @change="change"></th>
<th>操作</th>
</tr>
</thead>
<tbody>
<tr v-for="(item,index) in goodlist">
<th scope="row">{{item.id}}</th>
<td>{{item.name}}</td>
<td>{{item.price}}</td>
<td><button @click="handleDown(item)">-</button>
<input type="text" :value="item.number" >
<button @click="handleup(item)">+</button></td>
<!--把itme循环出来的对象放到value值中会把itme放到checkGroup数组内,绑定个change事件如果有一个被点了，那么全选取消-->
<td><input type="checkbox" v-model="checkGroup" :value="item" @change="handlecheckone"></td>
<td><button @click="clickdelete(item,index)">删除</button></td>
</tr>
</tbody>
</table>
<hr>
<p>{{checkGroup}}--{{checkall}}</p>
<p>总价格{{getprice()}}</p>
</div>
</div>
</div>
</body>
<script>
var vm = new Vue({
el:'#app',
data:{
goodlist:[
{id:1,name:'可乐',price:'3',number:2,kc:10},
{id:2,name:'雪碧',price:'3',number:1,kc:5},
{id:3,name:'红牛',price:'6',number:4,kc:4},
],
//定义一个用户选择的商品购物车用于计算价格
checkGroup:[],
checkall:false,
},
methods:{
getprice(){
var total = 0
for (item of this.checkGroup){
total += item.price * item.number
}
return total
},
change(){
// checkall如果为true说明勾选上了
if(this.checkall){
// 选择的表 = 商品表 =全选
this.checkGroup = this.goodlist
}else{
this.checkGroup = []
}
},
handlecheckone(){
// 判断长度是否不一致，如不一致说明并没有全选
if (this.checkGroup.length==this.goodlist.length){
this.checkall = true
}else {
this.checkall = false
}
},
handleDown(item){
if(item.number>1){
item.number--
}else{
alert('不能低于1')
}
},
handleup(item){
if(item.number >= item.kc){
alert('超出库存了')
}else{
item.number++
}
},
clickdelete(item,index){
this.goodlist.splice(index,1)
var text = this.checkGroup.indexOf(item)
if (text>=0){
this.checkGroup.splice(text,1)
}
}
}
})
</script>
</html>
