vue.js实战——升级版购物车

HTML:

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>购物车示例</title>
    <link rel="stylesheet" href="index.css">
</head>
<body>
    <div id="app" v-cloak>
        <template v-if="allListNum">
            <table>
                <thead>
                    <tr>
                        <th>
                            <input type="checkbox" v-model="checkAll">全选
                        </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>
                    <template v-for="(item,index) in list">
                            <tr v-if="item.content.length">
                                <td colspan="5">{{item.name}}</td>
                            </tr>
                            <tr v-for="(small,smallIndex) in item.content">
                                    <!-- <td>{{index+1}}</td> -->
                                    <td><input type="checkbox" :checked="small.check" @click="isAll(index,smallIndex)"> {{small.check}}</td>
                                    <td>{{small.name}}</td>
                                    <td>{{small.price}}</td>
                                    <td>
                                        <button @click="handleReduce(index,smallIndex)" :display="small.count===1">-</button>
                                            {{small.count}}
                                        <button @click="handleAdd(index,smallIndex)">+</button>
                                    </td>
                                    <td>
                                        <button @click="handleRemove(index,smallIndex)">移除</button>
                                    </td>
                                </tr>
                    </template>
                  
                </tbody>
            </table>
            <div>总价:¥{{totalPrice}}</div>
        </template>    
        <div v-else>
            购物车为空
        </div>
    </div>
    <script src="../../vue.js"></script>
    <script src="./index.js"></script>
</body>
</html>

JS:

var app=new Vue({
    el:'#app',
    data:{
        list:[
            {
                name:'电子产品',
                content:[
                    {
                        id:1,
                        name:'iPhone 7',
                        price:6288,
                        count:1,
                        check:false
                    },{
                        id:2,
                        name:'iPad Pro',
                        price:5888,
                        count:1,
                        check:false
                    },{
                        id:3,
                        name:'MacBook Pro',
                        price:21488,
                        count:1,
                        check:false
                    }
                ]
            },{
                name:'图书',
                content:[
                    {
                        id:1,
                        name:'《小王子》',
                        price:10000000000,
                        count:1,
                        check:false
                    },{
                        id:2,
                        name:'《失控》',
                        price:100,
                        count:1,
                        check:false
                    },{
                        id:3,
                        name:"《目送》",
                        price:40,
                        count:1,
                        check:false
                    },{
                        id:4,
                        name:'《爱与孤独》',
                        price:10,
                        count:1,
                        check:false
                    }
                ]
            }
           
        ],
        checkAll:false,
        smallHand:false
    },
    computed:{
        totalPrice:function(){
            var arr=[];
            for(var i=0;i<this.list.length;i++){
                arr=arr.concat(this.list[i]['content']);
            }
           this.newList=arr.filter(function(item){
                    if(item.check){
                        return item;
                    }
            });
            var total=0;
            for(var i=0;i<this.newList.length;i++){
                var item=this.newList[i];
                total+=item.price*item.count;
            }
            return total.toString().replace(/\B(?=(\d{3})+$)/g,',');//匹配后面已3个数字结尾的非单词边界,换成“,”
            /* replace:
                用于在字符串中用一些字符替换另一些字符,或替换一个与正则表达式匹配的子串
                \B  :匹配非单词边界
                (red|blue|green):查找任何指定的选项
                ?=n :匹配任何其后紧接指定字符串n的字符串(n量词)    提供后面的n找?
                \d  :查找数字
                n{X}:匹配包含X个n的序列字符串
                \d{3}:匹配含有3个数字的字符串
                n$  :匹配任何结尾为n的字符串
                n+  :匹配任何包含至少一个n的字符串
                (\d{3})+$   :匹配至少一个已含有3个数字字符串结尾的字符
             */    
        },
        allListNum:function(){
            var allNum=0;
            for(var i=0;i<this.list.length;i++){
                var item=this.list[i]['content'];
                for(var j=0;j<item.length;j++){
                    allNum++;
                }              
            }
            return allNum;
        }
    },
    methods:{
        handleReduce:function(index,smallIndex){
            console.log(index);
            console.log(smallIndex);
            if(this.list[index]['content'][smallIndex].count===1) return;
            this.list[index]['content'][smallIndex].count--;
        },
        handleAdd:function(index,smallIndex){
            this.list[index]['content'][smallIndex].count++;
        },
        handleRemove:function(index,smallIndex){
            this.list[index]['content'].splice(smallIndex,1);
            var num=0;
            for(var i=0;i<this.list.length;i++){
                var item=this.list[i]['content'];
                for(var j=0;j<item.length;j++){
                    if(item[j].check){
                        num++;
                    }else{
                        num--;
                    }
                }              
            }
            if(num==this.allListNum){
                this.checkAll=true;
            }else{
                this.checkAll=false;
            }
        },
        isAll:function(index,smallIndex){
            console.log(this.list[index]['content'][smallIndex].check);
            var indexItem=this.list[index]['content'][smallIndex];
            
            indexItem.check=!indexItem.check;
            var num=0;
            for(var i=0;i<this.list.length;i++){
                var item=this.list[i]['content'];
                for(var j=0;j<item.length;j++){
                    if(item[j].check){
                        num++;
                    }else{
                        num--;
                    }
                }              
            }
            console.log(num);////(选中了最后一个)3-全部勾选-勾选全选     (之前全部勾选,取消了任意一个勾选) 1-取消全选的勾选   
           // if(num==7||(num==5&&indexItem.check==false)){    这里的值不能写死,太笨了

           if(num==this.allListNum||(num==(this.allListNum-2)&&indexItem.check==false)){ 
                this.checkAll=indexItem.check;
                this.smallHand=true;
            }
        }
    },
    watch:{
        checkAll:function(){
            if(this.smallHand){

            }else{
                for(var i=0;i<this.list.length;i++){
                    var list=this.list;
                    for(var j=0;j<list[i]['content'].length;j++){
                        this.list[i]['content'][j]['check']=this.checkAll;
                    }
                }
            }
            this.smallHand=false;           
        }
    }
})

CSS:

[v-cloak] {
  display: none;
}
table {
  border: 1px solid #e9e9e9;
  border-collapse: collapse;
  border-spacing: 0;
  empty-cells: show;
}
table th,
table td {
  padding: 8px 16px;
  border: 1px solid #e9e9e9;
  text-align: left;
}
table th {
  background: #f7f7f7;
  color: #5c6b77;
  font-weight: 600;
  white-space: nowrap;
}

总结:相比前一个购物车,这个购物车可实现物品分类,数据又多了一层嵌套。

 

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转载自www.cnblogs.com/em2464/p/10414209.html