Vue

效果显示：

功能代码：

　　index.js:

var app = new Vue({
   el:'#app',
   data:{
      list:[
         {
            id:1,
            name:'redmi k20',
            price:2000,
            count:1
         },
         {
            id:2,
            name:'meizu 16xs',
            price:1499,
            count:1
         },
         {
            id:3,
            name:'realme X',
            price:1499,
            count:1
         }
      ]

   },
   computed:{
      totalPrice: function () {
         var total =0;
         for(var i = 0;i<this.list.length;i++){
            var item = this.list[i];
            total +=item.price*item.count;
         }
         return total.toString().replace(/\B(?=(\d{3})+$)/g,',');
      }
   },
   methods:{
      handleReduce:function (index) {
         if(this.list[index].count ===1)return;
         this.list[index].count--;
      },
      handleAdd:function (index) {
         this.list[index].count++;
      },
      handleRemove:function (index) {
         this.list.splice(index,1);
      }
   }
});

index.html:

<div id="app" v-cloak>
    <template v-if="list.length">
        <table>
            <thead>
                <tr>
                    <th></th>
                    <th>商品名称</th>
                    <th>商品单价</th>
                    <th>购买数量</th>
                    <th>操作</th>
                </tr>
            </thead>
            <tbody>
                <tr v-for = "(item,index) in list">
                    <td>{{ index + 1}}</td>
                    <td>{{ item.name}}</td>
                    <td>{{ item.price}}</td>
                    <td>
                        <button
                            @click="handleReduce(index)"
                            :disabled="item.count ===1"
                        >-</button>
                        {{item.count}}
                        <button @click="handleAdd(index)">+</button>
                    </td>
                    <td>
                        <button @click="handleRemove(index)">移除</button>
                    </td>

                </tr>
            </tbody>
        </table>
        <div>总价：￥{{totalPrice}}</div>
    </template>
    <div v-else>购物车为空</div>
</div>

!：
 1.computed：计算属性
 2.JavaScript splice方法