vue 简单使用

<template>
    <div v-if="cartList.length <= 0"> 购物车中没有商品</div>
    <div v-else>
           <table class="table">
                <tr>
                    <th>选择</th>
                    <th>编号</th>
                    <th>名称</th>
                    <th>价格</th>
                    <th>购买数量</th>
                    <th>操作</th>
                </tr>
                   <tr v-for="(cart,index) in cartList" :key="index" >
                   <td>
                       <input type="checkbox" name="ids" :id="'id'+cart.id" :value="cart.id"  v-model="ids" >
                   </td>
                   <td>{{cart.id}}</td>
                   <td>{{cart.name}}</td>
                   <td>{{cart.price.toFixed(2)}}</td>
                   <td>
                       <button @click="jian(cart.id,cart.price)">-</button>
                        {{cart.count}}
                       <button  @click="jia(cart.id,cart.price)">+</button>
                   </td>
                   <td><a href="" @click.prevent="del(cart.id)" >删除</a> </td>
                  </tr>
               <tr>
                   <td colspan="3">合计</td>
                   <td colspan="3">￥:{{getTotalPrice}}元</td>
               </tr>
           </table>
    </div>
</template>
<script>
export default {
  name: 'App',
  data(){
      return {
          ids:[],
          amount:0,
          cartList:[
              {id:1,name:'aaa',price:1.10,count:1},
              {id:2,name:'bbb',price:2.20,count:1},
              {id:3,name:'ccc',price:3.30,count:1},
              {id:4,name:'ddd',price:4.40,count:1},
              {id:5,name:'eee',price:5.50,count:1}
          ]
      }
  },
    methods:{
      del(id){
          let _this = this;
          for(let i=0;i<_this.cartList.length;i++){
              if(id===_this.cartList[i].id){
                  _this.cartList.splice(i,1);
              }
          }
      },
        jia(id){
            let _this = this;
            let cartList = _this.cartList;
            for(let i=0;i<cartList.length;i++){
                if(id===cartList[i].id){
                    cartList[i].count++;
                }
            }
        },
        jian(id){
            let _this = this;
            let cartList = _this.cartList
            for(let i=0;i<cartList.length;i++){
                if(id===cartList[i].id){
                    cartList[i].count--
                    if(cartList[i].count <= 0){
                        cartList[i].count=0;
                    }
                }
            }
        }
    },
    computed:{
      getTotalPrice:{
          get(){
              let _this= this;
              let price= 0;
              if(_this.ids.length>0){
                  for (let i =0;i<_this.ids.length;i++){
                      for(let j=0;j<_this.cartList.length;j++){
                          if(_this.ids[i]===_this.cartList[j].id){
                              price += (_this.cartList[j].price * _this.cartList[j].count)
                          }
                      }
                  }
              }
              _this.amount=price;
              return _this.amount.toFixed(2);
          }
      }
    }
}
</script>
<style>
    .table,tr,td,th{
        border: 1px solid black;
        border-spacing: 0;
    }
</style>