<!--
//按照组件化方式实现业务需求
// 根据业务功能进行组件化划分
// 1.标题组件(展示文本)
// 2.列表组件(列表展示 商品数量变更 商品删除)
// 3.结算组件(计算商品总额)
// 功能实现步骤:
// 实现整体布局和样式效果
// 划分独立的功能组件
// 结合所有的子组件形成整体结构
// 逐个实现各个组件功能
// 标题组件
// 列表组件
// 结算组件 -->
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<style type="text/css">
.container .cart {
width: 300px;
margin: auto;
}
.container .title {
background-color: lightblue;
height: 40px;
line-height: 40px;
text-align: center;
/*color: #fff;*/
}
.container .total {
background-color: #FFCE46;
height: 50px;
line-height: 50px;
text-align: right;
}
.container .total button {
margin: 0 10px;
background-color: #DC4C40;
height: 35px;
width: 80px;
border: 0;
}
.container .total span {
color: red;
font-weight: bold;
}
.container .item {
height: 55px;
line-height: 55px;
position: relative;
border-top: 1px solid #ADD8E6;
}
.container .item img {
width: 45px;
height: 45px;
margin: 5px;
}
.container .item .name {
position: absolute;
width: 90px;
top: 0;left: 55px;
font-size: 16px;
}
.container .item .change {
width: 100px;
position: absolute;
top: 0;
right: 50px;
}
.container .item .change a {
font-size: 20px;
width: 30px;
text-decoration:none;
background-color: lightgray;
vertical-align: middle;
}
.container .item .change .num {
width: 40px;
height: 25px;
}
.container .item .del {
position: absolute;
top: 0;
right: 0px;
width: 40px;
text-align: center;
font-size: 40px;
cursor: pointer;
color: red;
}
.container .item .del:hover {
background-color: orange;
}
</style>
</head>
<body>
<div id="app">
<div class="container">
<my-cart></my-cart>
</div>
</div>
<script type="text/javascript" src="js/vue.js"></script>
<script type="text/javascript">
var cartTitle = {
props:['uname'],
template: `
<div class="title">{{uname}}商品</div>
`
}
var cartList = {
props:['list'],//props传递的数据是不做修改的
// $even得到当前值
template: `
<div>
<div class="item" :key = 'item.id' v-for='item in list'>
<img :src="item.img"/>
<div class="name">{{item.name}}</div>
<div class="change">
<a href="" @click.prevent='sub(item.id)'>－</a>
<input type="text" class="num" :value = 'item.num' @blur='changeNum(item.id,$event)'/>
<a href="" @click.prevent='add(item.id)'>＋</a>
</div>
<div class="del" @click='del(item.id)'>×</div>
</div>
</div>
`,
methods:{
del:function(id){
// console.log(id);
//把id传递给父组件
this.$emit('cart-del',id);//$emit传递值
},
changeNum:function(id,event){
//不推荐直接操作list数据,还是把id和值传递给父组件
// console.log(id,event.target.value);
this.$emit('cart-change',{
id:id,
num:event.target.value
})
},
sub:function(id){
this.$emit('sub-num',id);
},
add:function(id){
this.$emit('add-num',id);
}
}
}
var cartTotal = {
props:['list'],
template: `
<div class="total">
<span>总价：{{total}}</span>
<button>结算</button>
</div>
`,
computed:{
total:function(){
//计算商品的总价
var t = 0;
this.list.forEach(item=>{
t += item.price * item.num;
})
return t;
}
}
}
Vue.component('my-cart',{
data:function(){
return{
uname:'张三',
list: [{
id: 1,
name: 'TCL彩电',
price: 1000,
num: 1,
img: 'img/a.jpg'
},{
id: 2,
name: '机顶盒',
price: 1000,
num: 1,
img: 'img/b.jpg'
},{
id: 3,
name: '海尔冰箱',
price: 1000,
num: 1,
img: 'img/c.jpg'
},{
id: 4,
name: '小米手机',
price: 1000,
num: 1,
img: 'img/d.jpg'
},{
id: 5,
name: 'PPTV电视',
price: 1000,
num: 2,
img: 'img/e.jpg'
}]
}
},
template:`
<div class="cart">
<cart-title :uname='uname'></cart-title>
<cart-list :list='list' @cart-del='delCart($event)' @cart-change='changeCart($event)' @sub-num='subNum($event)' @add-num='addNum($event)'></cart-list>
<cart-total :list='list'></cart-total>
</div>
`,
//定义局部控件,防止和父组件冲突
components:{
'cart-title':cartTitle,
'cart-list':cartList,
'cart-total':cartTotal,
},
//删除项目
methods:{
//最好在夫组件中删除
delCart:function(id){
//根据id删除list对应的数据
//1.找到id对应数据的索引
var index = this.list.findIndex(item=>{
return item.id === id;
});
//2.根据索引删除数据
this.list.splice(index,1);
},
changeCart:function(val){
// 根据子组件的数据,改变list中的数据
this.list.some(item=>{
if(item.id == val.id){
item.num = val.num;
//终止遍历
return true;
}
})
},
addNum:function(id){
// console.log(this.list);
this.list.some(item=>{
if(item.id == id){
item.num ++;
//终止遍历
return true;
}
})
},
subNum:function(id){
// console.log(this.list);
this.list.some(item=>{
if(item.num > 0) {
if(item.id == id){
item.num --;
//终止遍历
return true;
}
}else{
return
}
})
},
}
})
var vm = new Vue({
el: '#app',
data: {
}
});
</script>
</body>
</html>
