原生购物车Vue改写

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>购物车_vue</title>
    <script src="https://unpkg.com/vue@next"></script>
    <style>
      *{
        margin: 0;
        padding: 0;
        box-sizing: border-box;
      }
      .box {
        width: 35em;
        height: 2em;
        margin: auto;
      }
      .list > li {
        height: 1.6em;
        background-color: #efefef;
        display: grid;
        grid-template-columns: repeat(5, 6em);
        gap: 1em;
        place-items: center left;
        border-bottom: 1px solid #ccc;
      }
      .list > li:first-of-type {
        background-color: rgb(33, 91, 138);
        color: white;
      }
      .list > li:hover:not(:first-of-type) {
        cursor: pointer;
        background-color: rgb(85, 125, 212);
      }
      .list > li input[type="number"] {
        width: 3em;
        border: none;
        outline: none;
        text-align: center;
        font-size: 1em;
        background-color: transparent;
      }
      .list > li:nth-last-of-type(2) span.total-num,
      .list > li:nth-last-of-type(2) span.total-amount {
        grid-column: span 2;
        place-self: center left;
        color: rgb(85, 125, 212);
      }
      .list > li:last-of-type span{
        grid-column: span 2;
        place-self: center right;
        color: red;
      }
    </style>
  </head>
  <body>
    <!-- vue挂载点 -->
    <div class="app">
      <div class="box" @change="updata($event)">
        <div class="select-all" @click="selectAll=!selectAll">
          <input type="checkbox" class="check-all" :checked="selectAll"/>
          <label for="check-all">全选</label>
        </div>
        <ul class="list" ref="list">
          <!-- 表单头 -->
          <li>
            <span v-for="(item, index) of shopCartList" :key="index"
              >{{item}}</span
            >
          </li>
          <!-- 商品list -->
          <Item-list name="手机" price="100"></Item-list>
          <Item-list name="电脑" price="200"></Item-list>
          <Item-list name="相机" price="300"></Item-list>
          <Item-list name="冰箱" price="400"></Item-list>
          <li>
            <span>总计</span>
            <span class="total-num">数量: {{numbers}}</span>
            <span class="total-amount">总金额: {{totalPay}}</span>
          </li>
          <li>
            <span>折扣金额: {{disCount}}</span>
            <span>应付金额: {{disPay}}</span>
          </li>
        </ul>
      </div>
    </div>
    <!-- 商品list模板 -->
    <template id="itemLists">
      <li>
        <input type="checkbox"/> 
        <span class="content">{{name}}</span>
        <input type="number" v-model="num" min="1"/>
        <span class="price">{{price}}</span>
        <span class="amount">{{payAmount}}</span>
      </li>
    </template>
  </body>
  <script>
    // vue实例
    const app = Vue.createApp({
      data() {
        return {
          shopCartList: ["选择", "品名", "数量", "单价", "金额"],
          numbers:0,
          totalPay:0,
          disCount:0,
          disPay:0,
          selectAll:true
        };
      },
      methods:{
        updata(el){
          if(this.selectAll && ( el===0 || (el.target.className==="check-all") )){
            [...document.querySelectorAll(".list>li input[type='checkbox']")].map(item=>item.checked=true);
          }else if(el===0 ||el.target.className==="check-all"){
            [...document.querySelectorAll(".list>li input[type='checkbox']")].map(item=>item.checked=false);
          }
          const item_ck = [...document.querySelectorAll(".list>li input[type='checkbox']")];
          if(item_ck.every(item=>item.checked)){
            this.selectAll=true;
          }else{
            this.selectAll=false;
          }
          const item_price = [...document.querySelectorAll(".price")];
          const item_num = [...document.querySelectorAll(".list>li input[type='number']")];
          // item_ck.forEach(item=>console.log(item.checked));
          let temp_num_list = item_num.map((item,index)=>{
            if(item_ck[index].checked){
              return parseInt(item.value);
            }else{
              return 0;
            }
          });
          this.numbers = temp_num_list.reduce((res,index)=>res+index);
          this.totalPay = temp_num_list.map((item,index)=>item*item_price[index].textContent).reduce((acc,index)=>acc+index);
        }
      },
      watch:{
        totalPay(current,origin){
          switch(true){
            case current>=600:
              this.disCount=100;
              break;
            default:
              this.disCount = 0;
          }
          this.disPay = current-this.disCount;
        }
      },   
      mounted(){
        this.$nextTick(function(){
          this.updata(0);
        })
      },
    });
    // 注册组件
    app.component("ItemList", {
      template: "#itemLists",
      props: ["name", "price"],
      data(){
        return {
            num:1,
        };
      },
      computed:{
        payAmount(){
            return this.num*this.price;
        }
      }
    });
    // 挂载实例
    app.mount(".app");
  </script>
</html>
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