<!DOCTYPE html>
<html>
<head>
<title>购物车</title>
<style type="text/css">
span{cursor: pointer;}
</style>
</head>
<body>
<div id="app">
<div>
课程：<input type="text" name="" v-model='course'>
价钱：<input type="text" name="" v-model='price'>
<button @click='addcourse'>添加商品</button>
</div>
<ul>
<li v-for='(list,index) in classlist'>
课程名称：{{list.text}}---价格:{{list.price}}
<button @click='addtochat(index)'>添加到购物车</button>
</li>
</ul>
<chat :chatarr='chatarr'></chat>
</div>
<script type="text/javascript" src="vue.js"></script>
<script type="text/javascript">
var Chat={
props:['chatarr'],
template:`
<div>
购物车
<table border="1">
<tr>
<th>选中</th>
<th>课程</th>
<th>数量</th>
<th>价格</th>
</tr>
<tr v-for="(chat,index) in chatarr">
<td><input type="checkbox" name="" v-model='chat.active'></td>
<td>{{chat.text}}</td>
<td>
<span @click='reducecount(index)'>-</span>
{{chat.count}}
<span @click='addcount(index)'>+</span>
</td>
<td>{{chat.count * chat.price}}</td>
</tr>
<tr>
<td colspan='2'>选中的课程：{{activeCount}}/{{count}}</td>
<td colspan='2'>需付金额：{{totalpirce}}</td>
</tr>
</table>
</div>
`,
//计算属性
computed:{
//已选中课程
activeCount(){
return this.chatarr.filter(v=>v.active).length
},
//购物车存在多少项课程
count(){
return this.chatarr.length
},
//总价
totalpirce(){
let total=0
this.chatarr.forEach(v=>{
if(v.active){
total+=v.price*v.count
}
})
return total
}
},
// watch:{
// //监听购物车数组，每当监听到改变就存进本地存储做数据持久化
// chatarr:{
// handler(){
// window.localStorage.setItem('chat',JSON.stringify(this.chatarr))
// },
// deep:true
// }
// },
methods:{
//增加购物车商品数量
addcount(index){
this.chatarr[index].count++
},
//减少购物车商品数量
reducecount(index){
if(this.chatarr[index].count>1){
this.chatarr[index].count--
}else{
if(window.confirm(`是否删除${this.chatarr[index].text}?`)){
this.chatarr.splice(index,1)
}
}
}
}
}
new Vue({
el:'#app',
components:{
Chat
},
data(){
return {
classlist:[
{text:'springcloud',price:20},
{text:'vue',price:30},
{text:'js',price:40},
{text:'php',price:50},
],
course:'',
price:'',
chatarr:[],//购物车数组
}
},
watch:{
//监听购物车数组，每当监听到改变就存进本地存储做数据持久化
chatarr:{
handler(){
window.localStorage.setItem('chat',JSON.stringify(this.chatarr))
},
deep:true
},
classlist:{
handler(){
window.localStorage.setItem('classlist',JSON.stringify(this.classlist))
},
deep:true
},
},
methods:{
//添加课程
addcourse(){
//插入数据到我们的商品库
this.classlist.push({text:this.course,price:this.price})
//清空我们刚输入的商品信息
this.course=''
this.price=''
},
//添加到购物车
addtochat(index){
const goods=this.classlist[index]
const result=this.chatarr.find(v=>v.text==goods.text)
if(result){
result.count+=1
}else{
this.chatarr.push({...goods,count:1,active:true})
}
},
},
created(){
//利用本地存储做数据持久化 获取本地存储数据
this.chatarr=JSON.parse(window.localStorage.getItem('chat'))
this.classlist=JSON.parse(window.localStorage.getItem('classlist'))
console.log(this.chatarr)
if(this.chatarr==null){
this.chatarr=[]
}
if(this.classlist==null){
this.classlist=[]
}
}
})
</script>
</body>
</html>