How to realize the function of multiple selection of goods by vue

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Vue implementation to achieve full selection, settlement * {margin: 0; padding: 0; list-style: none;} # app {width: 80%; margin: auto;} .wrap {width: 100%; margin: auto;} .shangjia {font-size: 20; font-weight: bold; color: # 000; height: 36px; line-height: 36px Inpu {margin-right: 10px; margin-left: 10px;} .all _ list {padding-top: 10px; width: 100%; margin: auto; background: # bbb;} .list _ item {width: 80%; display: flex; justify-content: flex-start; position: relative; margin: 3px 0; padding: 6px 0;} img {display: inline-block;} .list _ box {display: inline-block }. List_img_tit_price {display:inline-flex; align-content:space-between;}. List_img {width: 100px; height: 100px;} .list_tit_price {display: flex; flex-flow: column; margin-left:10px; font-size: 16px; justify-content: space-between;} .total {display:inline-flex; flex-wrap: row; float: right; margin-top: 60px; margin-left: 20px }. Num_cancle,.num_add {font-size: 20px; font-weight: bolder; margin:0 2px; padding: 1PX; line-height: 36px;} .num_cancle:hover,.num_add:hover {cursor: pointer;}. Num_total {width:30px; text-align: center; font-weight: bold;} .result {float: right; display: inline-flex;} .heji {margin:0 12px; padding:3px;} .jisuan_btn {color: # fff Background: # f30; font-size: 18px; font-weight: bold; padding: 3px; border-style: none;} Select all merchandise

{{item.title}} ¥{{item.price}}-+ Total of all: {{amountPrice}} To settle ({{sumTotal}}) const vm = new Vue ({el: "# app") Data: {allList: [{title: "[first] the water of the Yellow River comes from the sky Src:'./img/1.jpg', price:880, order:1, id:0}, {title: [second] the water of the Yellow River comes from the sky. Src:'./img/2.jpg', price:881, order:1, id:1}, {title: [third] the water of the Yellow River comes from the sky. Src:'./img/3.jpg', price:882, order:1, id:2}, {title: [fourth] the water of the Yellow River comes from the sky. Src:'./img/4.jpg', price:883, order:1, id:3}, {title: [fifth] the water of the Yellow River comes from the sky. Src:'./img/5.jpg', price:884, order:1, id:4}, {title: [sixth] the water of the Yellow River comes from the sky. Src:'./img/6.jpg', price:885, order:1, id:5},]}, methods: {controlNum (temp,index) {if (temp=== "add") {this.allList.order + + } else {if (this.allList.order el.checked)}, amountPrice () {let price = 0; this.selectTotal.forEach (el = > {price + = el.price * el.order}) return price;}, sumTotal () {let total=0; for (let I = 0; I)

< this.selectTotal.length; i ++){ total += this.selectTotal[i].order; } return total; }, checkedClick(e){ return e; }, checkedAll:{ get(){ return this.allList.every(el=>

El.checked)}, set (val) {this.allList.forEach (el= > el.checked=val)}) vm.allList.forEach (el= > vm.$set (el, "checked", false))

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