自己手敲的VUE组件化购物车案例 纪念一下

<div id="app">
        <div class="container">
            <my-cart></my-cart>
        </div>
    </div>
    <script type="text/javascript" src="js/vue.js"></script>
    <script type="text/javascript">
        var cartTitle = {
            props: ['uname'],
            template: `<div class="title">{{uname}}的商品</div>`
        }
        var cartList = {
            props: ['sss'],
            template: ` <div>
                    <div class="item" :key='item.id' v-for='item in sss'>
                        <img :src="item.img" />
                        <div class="name"></div>
                        <div class="change">
                            <a href="" @click.prevent='sub(item.id)'>－</a>
                            <input type="text" class="num" :value='item.num' @blur=changeNumm(item.id,$event) />
                            <a href="" @click.prevent='add(item.id)'>＋</a>
                        </div>
                        <div class="del" @click='del(item.id)'>×</div>
                    </div>
                </div>`,
            methods: {
                changeNumm(id, event) {
                    if (event.target.value < 1) {
                        event.target.value = 1
                    }
                    this.$emit('changeNum', {
                        id: id,
                        type: 'change',
                        num: event.target.value
                    })
                },
                sub: function(id) {
                    this.$emit('changeNum', {
                        id: id,
                        type: 'sub'
                    });
                },
                add: function(id) {
                    this.$emit('changeNum', {
                        id: id,
                        type: 'add'
                    });
                },
                del(id) {
                    this.$emit('delete', id)
                }
            }
        }
        var cartTotal = {
            props: ['ttt'],
            template: `<div class="total">
                    <span>总价：{{total}}</span>
                    <button>结算</button>
                </div>`,
            computed: {
                total: function() {
                    var t = 0
                    this.ttt.forEach(item => {
                        t += item.price * item.num
                    })
                    return t
                }
            },

        }
        Vue.component('my-cart', {
            data: function() {
                return {
                    uname: '张三',
                    list: [{
                        id: 1,
                        name: 'TCL彩电',
                        price: 1000,
                        num: 1,
                        img: 'img/a.jpg'
                    }, {
                        id: 2,
                        name: '机顶盒',
                        price: 1000,
                        num: 1,
                        img: 'img/b.jpg'
                    }, {
                        id: 3,
                        name: '海尔冰箱',
                        price: 1000,
                        num: 1,
                        img: 'img/c.jpg'
                    }, {
                        id: 4,
                        name: '小米手机',
                        price: 1000,
                        num: 1,
                        img: 'img/d.jpg'
                    }, {
                        id: 5,
                        name: 'PPTV电视',
                        price: 1000,
                        num: 2,
                        img: 'img/e.jpg'
                    }]
                }
            },
            template: ` <div class="cart">
                            <cart-title :uname='uname'></cart-title>
                            <cart-list :sss='list' @delete='deleteCart' @changeNum='changeNNN($event)'></cart-list>
                            <cart-total :ttt='list'></cart-total>
                            </div>`,
            components: {
                'cart-title': cartTitle,
                'cart-list': cartList,
                'cart-total': cartTotal
            },
            methods: {
                deleteCart(id) {
                    var index = this.list.findIndex(item => {
                        return item.id == id;
                    });
                    // 2、根据索引删除对应数据
                    this.list.splice(index, 1);
                },
                changeNNN(val) {
                    // 分为三种情况：输入域变更、加号变更、减号变更
                    if (val.type == 'change') {
                        // 根据子组件传递过来的数据，跟新list中对应的数据
                        this.list.some(item => {
                            if (item.id == val.id) {
                                item.num = val.num;
                                // 终止遍历
                                return true;
                            }
                        });
                    } else if (val.type == 'sub') {
                        // 减一操作
                        this.list.some(item => {
                            if (item.id == val.id) {
                                if (item.num > 1) {
                                    item.num -= 1;
                                }
                                // 终止遍历
                                return true;
                            }
                        });
                    } else if (val.type == 'add') {
                        // 加一操作
                        this.list.some(item => {
                            if (item.id == val.id) {
                                item.num += 1;
                                // 终止遍历
                                return true;
                            }
                        });
                    }
                }

            }
        })
        var vm = new Vue({
            el: '#app',
            data: {

            }
        });
    </script>