演示地址:https://jinxiaoliang.cn/Personal/Car/Car.html

实现步骤

1.按照组件化方式实现业务需求

  • 根据业务功能进行组件化划分

    • 标题组件(展示文本)
    • 列表组件(列表展示、商品数量变更、商品删除)
    • 结算组件(计算商品总额)

2.功能实现步骤

  • 实现整体布局和样式效果
  • 划分独立的功能组件
  • 组合所有的子组件形成整体结构
  • 逐个实现各个功能组件

    • 标题组件
    • 列表组件
    • 结算组件

3.代码

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Document</title>
  <style type="text/css">
    .container {
    }
    .container .cart {
      width: 300px;
      /*background-color: lightgreen;*/
      margin: auto;
    }
    .container .title {
      background-color: lightblue;
      height: 40px;
      line-height: 40px;
      text-align: center;
      /*color: #fff;*/  
    }
    .container .total {
      background-color: #FFCE46;
      height: 50px;
      line-height: 50px;
      text-align: right;
    }
    .container .total button {
      margin: 0 10px;
      background-color: #DC4C40;
      height: 35px;
      width: 80px;
      border: 0;
    }
    .container .total span {
      color: red;
      font-weight: bold;
    }
    .container .item {
      height: 55px;
      line-height: 55px;
      position: relative;
      border-top: 1px solid #ADD8E6;
    }
    .container .item img {
      width: 45px;
      height: 45px;
      margin: 5px;
    }
    .container .item .name {
      position: absolute;
      width: 90px;
      top: 0;left: 55px;
      font-size: 16px;
    }

    .container .item .change {
      width: 100px;
      position: absolute;
      top: 0;
      right: 50px;
    }
    .container .item .change a {
      font-size: 20px;
      width: 30px;
      text-decoration:none;
      background-color: lightgray;
      vertical-align: middle;
    }
    .container .item .change .num {
      width: 40px;
      height: 25px;
    }
    .container .item .del {
      position: absolute;
      top: 0;
      right: 0px;
      width: 40px;
      text-align: center;
      font-size: 40px;
      cursor: pointer;
      color: red;
    }
    .container .item .del:hover {
      background-color: orange;
    }
  </style>
</head>
<body>
  <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 CarTitle = {
        props:['uname'],
        template:`
        <div class="title">{{uname}}的商品</div>
        `
    };
    var CarList = {
        props: ['list'],
        template: `
        <div>
          <div class="item" :key='item.id' v-for='item in list'>
            <img :src="item.img"/>
            <div class="name">{{item.name}}</div>
            <div class="change">
              <a href="" @click.prevent='sub(item.id)'>-</a>
              <input type="text" class="num" :value='item.num' @blur='changNum(item.id,$event)'/>
              <a href="" @click.prevent='add(item.id)'>+</a>
            </div>
            <div class="del" @click='del(item.id)'>×</div>
          </div>
        </div>
        `,
        methods: {
            del: function(id) {
                this.$emit('cart-del',id)
            },
            changNum: function(id,event) {
                this.$emit('change-num',{
                    id: id,
                    type: 'change',
                    num:event.target.value
                });
            },
            sub: function(id) {
                this.$emit('change-num',{
                    id: id,
                    type: 'sub'
                })
            },
            add: function(id) {
                this.$emit('change-num',{
                    id: id,
                    type: 'add'
                })
            }
        }
    };
    var CarTotal = {
        props: ['list'],
        template: `
         <div class="total">
          <span>总价:{{total}}</span>
          <button>结算</button>
        </div>
        `,
        computed: {
            total: function() {
                //计算商品的总价
                var t = 0;
                this.list.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 :list='list' @cart-del='delCart($event)' @change-num='changeNum($event)'></cart-list>
            <cart-total :list='list'></cart-total>
        </div>
        `,
        components: {
            'cart-title':CarTitle,
            'cart-list':CarList,
            'cart-total':CarTotal
        },
        methods: {
            delCart: function(id) {
                //1.找到id对应数据的索引
                var index = this.list.findIndex(item => {
                    return item.id == id
                });
                //2.根据索引删除相应的数据
                this.list.splice(index,1)
            },
            changeNum: function(val) {
                //分为三种情况:输入域变更、加号变更、减号变更
                if(val.type == 'change') {
                    this.list.some(item => {
                        if(item.id == val.id) {
                            item.num = val.num;
                            return true;
                        }
                    })
                } else if(val.type == 'sub') {
                    this.list.some(item => {
                        if(item.id == val.id && item.num >= 1) {
                            item.num -= 1;
                            //终止遍历
                            return true;
                        }
                    })
                } else if(val.type == 'add') {
                    this.list.some(item => {
                        if(item.id == val.id && item.num >= 1) {
                            item.num += 1;
                            //终止遍历
                            return true
                        }
                    })
                }
            }
        }
    });
    var vm = new Vue({
      el: '#app',
      data: {
      }
    });

  </script>
</body>
</html>

演示地址:https://jinxiaoliang.cn/Personal/Car/Car.html

Last modification:May 6th, 2020 at 10:48 pm
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