Vue实现商城里面多个商品计算，全选，删除

<!--包含  全选/不全选   批量删除   全部金额计算   数量加减-->

简陋的CSS代码

.main{
    width: 100%;
}
.title{
    width: 100%;
    height: 40px;
    line-height: 40px;
    background: #4c4c4c;
    color: #ffffff;
}
.title input{
    width: 20px;
    height:20px;
    background: #ffffff;
    margin-left: 20px;
    appearance: checkbox;
    -webkit-appearance: checkbox;
}
.list_item input{

    width: 20px;
    height:20px;
    appearance: checkbox;
    -webkit-appearance: checkbox;
}
ul{
    width: 100%;
}
li.list_item{
    width: 100%;
    height: 100px;
    border-bottom: 4px solid blue;
    padding: 4px;
}
li.list_item .L{
    width: 20%;
    height: 100%;
}
li.list_item .L img{
    width: 100%;
    height: 100%;
}
li.list_item .R{
    width: 80%;
    height: 100%;
}
.jian,.jia{
    display: inline-block;
    width: 40px;
    height: 40px;
    line-height: 40px;
    text-align: center;
    background: black;
    color: #ffffff;
}

HTML代码

<div class="main">
    <div class="title">
        <input type="checkbox" name="vehicle1" value="Bike" @click="quan" v-model="quanTodo">全选/不全选
        <span class="fr" @click="deleteTodo">批量删除</span>
    </div>
    <ul class="list">
        <li class="list_item" v-for="(item,index) in list">
            <div class="L fl">
                <img src="../img/timg1.jpg">
            </div>
            <div class="R fl">
                <h1>{{item.title}}</h1>
                <div class="compute">
                    <span class="price"></span>
                    <div class="compute_R">
                        <span class="jian" @click="jian(item)">-</span>
                        <span class="num">{{item.num}}</span>
                        <span class="jia" @click="add(item)">+</span>
                    </div>
                    <input type="checkbox" name="vehicle" :checked="item.checkbox" v-model="item.checkbox">
                </div>
            </div>
        </li>
    </ul>
    共计{{reversedMessage}}元
</div>

JS代码

let arr=[
    {title:'商品1',num:1,price:10,checkbox:true},
    {title:'商品2',num:1,price:20,checkbox:true},
    {title:'商品3',num:1,price:30,checkbox:true},
    {title:'商品4',num:1,price:40,checkbox:true}
];
var vm=new Vue({
    el:".main",
    data:{
        list:arr,
        quanTodo:true
    },
    computed: {
        reversedMessage: function () {
            var price=0;
            for(var i=0;i<this.list.length;i++){
                if(this.list[i].checkbox){
                    price+=this.list[i].num*this.list[i].price;
                }
            }
            return price;
        }
    },
    methods:{
        a(item){
            console.log(item);
        },
        jian(item){
            if(item.num>0){
                item.num--;
            }

        },
        add(item){
            item.num++;
        },
        quan(){
            console.log(this.quanTodo);
            if(this.quanTodo==true){
                for(var i=0;i<this.list.length;i++){
                    this.list[i].checkbox=false;
                }
                console.log('不选中'+this.quanTodo);
            }
            else{
                console.log('选中'+this.quanTodo);
                console.log(this.list);
                for(var j=0;j<this.list.length;j++){
                    this.list[j].checkbox=true;
                    console.log(this.list[j].checkbox);
                }
            }
        },
        deleteTodo(){
            for(var i=this.list.length-1;i>=0;i--){
                if(this.list[i].checkbox){
                    var index=this.list.indexOf(this.list[i]);
                    this.list.splice(index,1);
                }
            }
        }
    }
});