Vue.js实现的购物车功能详解

<div id="app">
    <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>
            <th><input type="checkbox" name="list" @click="checkBox()" id="checkBox"></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" class="btn"> - </button>
                {{ item.count }}
                <button @click="handleAdd(index)" class="btn"> + </button>
            </td>
            <td>
                <button @click="handleRemove(index)" class="btns">移除</button>
            </td>
            <td style="text-align: center;">
                <input type="checkbox" name="list" @click="totalPrices()">
            </td>
          </tr>
        </tbody>
      </table>
      <div id="price">总价：￥{{totalPrice}}</div>
    </template>
    <div v-else>购物车为空</div>
</div>

*{
  margin: 0px;
  padding: 0px;
}
[v-cloak] {
  display: none;
}
#app{
  width: 200px;
  height: 200px;
  margin: 10px auto;
  text-align: center;
}
#price{
  width: 457px;
  height: 40px;
  border: 1px solid #e9e9e9;
  border-top: 0;
  line-height: 40px;
}
table{
  border: 1px solid #e9e9e9;
  border-collapse: collapse;
  border-spacing: 0;
  empty-cells: show;
}
th,td{
  padding: 8px 16px;
  border:1px solid #e9e9e9e9;
  text-align: left;
}
th{
  background: #f7f7f7;
  color: #5c6c77;
  font-weight: 600;
  white-space: nowrap;
}
.btn{
  width: 20px;
  height: 20px;
  border-radius: 50%;
  border:1px solid #cccccc;
  background: #ffffff;
  color: #778899;
}
.btns{
  width: 40px;
  height: 20px;
  border-radius: 5px;
  border:1px solid #cccccc;
  background: #ffffff;
  color: #778899;
  line-height: 20px;
}

var app=new Vue({
      el:'#app',
      data:{
        list: [
          {
            id:1,
            name:'iPhone 7',
            price:6188,
            count:1
          },
          {
            id:2,
            name:'iPad Pro',
            price:5888,
            count:1
          },
          {
            id:3,
            name:'MaxBook Pro',
            price:21488,
            count:1
          }
        ],
        totalPrice: 0
      },
      methods:{
        handleReduce: function (index) {//减少按钮
          if(this.list[index].count === 1){
            return;
          }
          this.list[index].count--;
          this.$options.methods.totalPrices();
        },
        handleAdd: function (index) {//增加按钮
          this.list[index].count++;
          this.$options.methods.totalPrices();
        },
        handleRemove: function (index) {//移除按钮
          this.list.splice(index, 1);
          $("tr").eq(index+1).remove("input[type='checkbox']");
          this.$options.methods.totalPrices();
        },
        checkBox: function (){//选中状态
          if($("#checkBox").is(':checked')==true){
            $("input[type='checkbox']").each(function(){
              $("input[type='checkbox']").attr("checked",true);
            });
          }else{
            $("input[type='checkbox']").each(function(){
              $("input[type='checkbox']").attr("checked",false);
            });
          }
          this.$options.methods.totalPrices();
        },
        totalPrices: function (){//计算总价格
          var total = 0;
          for(var i = 0;i < app.list.length;i++){
            var item = app.list[i];
            if($("input[type='checkbox']").eq(i+1).is(':checked')){
              total += item.price * item.count;
            }
          }
          app.totalPrice = total.toString().replace(/\B(?=(\d{3})+$)/g,',');
        }
      }
});