18-watch-購(gòu)物車(chē)

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="./js/vue.js"></script>
    <style>
        li {
            display: flex;
            justify-content: space-around;
            text-align: center;
            line-height: 100px;
            height: 100px;
            padding: 10px;
        }

        img {
            width: 100px;
            height: 100px;
        }
    </style>
</head>

<body>
    <div id="box">
        <div v-if='list.length === 0'>空空如也</div>
        <template v-else>
            <input type="checkbox" v-model="isAllChecked">全選/全不選
            <ul>
                <li v-for='(item,index) in list' :key='item.id'>
                    <div>
                        <input type="checkbox" v-model='checkgroup' :value="item" @change="checked()">
                    </div>
                    <img :src="item.pic" alt="">
                    <div>{{item.name}}</div>
                    <div>￥{{item.price}}</div>
                    <div>{{item.id}}</div>
                    <div>
                        <button @click="item.number--" :disabled="item.number===1">-</button>
                        {{item.number}}
                        <button @click="item.number++" :disabled="item.number === item.limit">+</button>
                    </div>
                    <div>
                        <button @click="handleDel(index,item.id)">刪除</button>
                    </div>
                </li>
            </ul>
            <div style="text-align: right;padding: 0 50px;">
                總價(jià){{sum()}}
            </div>
        </template>
    </div>
    <script>
        var vm = new Vue({
            el: '#box',
            data: {
                checkgroup: [],
                isAllChecked: false,
                list: [
                    {
                        "id": 1,
                        "name": "商品1",
                        "number": 1,
                        "pic": "https://c-ssl.duitang.com/uploads/blog/202011/16/20201116210409_fdb12.jpg",
                        "msg": "頭像",
                        "price": 10,
                        "limit": 1,//限購(gòu)
                    },
                    {
                        "id": 2,
                        "name": "商品2",
                        "number": 2,
                        "pic": "https://c-ssl.duitang.com/uploads/blog/202010/31/20201031204228_sewqy.jpg",
                        "msg": "頭像",
                        "price": 20,
                        "limit": 5,//限購(gòu)
                    },
                    {
                        "id": 3,
                        "name": "商品3",
                        "number": 3,
                        "pic": "https://c-ssl.duitang.com/uploads/item/202005/23/20200523141101_ungtj.jpg",
                        "msg": "頭像",
                        "price": 30,
                        "limit": 10,//限購(gòu)
                    },
                ]
            },
            methods: {
                sum() {
                    var total = 0
                    this.checkgroup.forEach(item => {
                        total += item.price * item.number
                    })
                    return total
                },
                // 刪除方法
                handleDel(index, deleteid) {
                    // 刪除checkgroup里面對(duì)應(yīng)的元素，通過(guò)id
                    this.checkgroup = this.checkgroup.filter(item => item.id !== deleteid)
                    // 刪除原數(shù)組，通過(guò)index
                    this.list.splice(index, 1)

                    //判定是否全勾選上
                    this.checked()
                },
                //全選/全不選
                // handleChange(ev) {
                //     // console.log("change",ev.target.checked)
                //     console.log(this.isAllChecked)
                //     if (this.isAllChecked) {
                //         this.checkgroup = this.list
                //     } else {
                //         this.checkgroup = []
                //     }
                //     //判斷是否全選
                // },
                checked() {
                    if (this.checkgroup.length === this.list.length) {
                        this.isAllChecked = true
                    } else {
                        if(this.checkgroup.length === this.list.length){
                            this.isAllChecked = false
                        }
                    }
                }
            },
            //監(jiān)聽(tīng)狀態(tài)的改變
            watch:{
                isAllChecked(data){
                    console.log("isAllChecked狀態(tài)改變了",data)
                    if (this.isAllChecked) {
                        this.checkgroup = this.list
                    } else {
                        this.checkgroup = []
                    }
                }
            }
        })
    </script>
</body>

</html>
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