组件化开发案例

代码在最下面

购物车案例:

总览:my-cart里有三个子组件以及数据。

中间组件的逻辑:
1页面上的内容是通过父组件传递值来显示,而不是通过双向数据绑定。

 

2对数据进行修改也全都是通过子传父的方式改变父组件中的数据(数据一直在父组件中)
当多个按钮要对data中的同一个数据进行修改时可定义同一个事件,给同一个事件添加不同类型

 

 3父组件接收(type别忘记加引号)

形式就是:

子组件模板:    @click='add(item.id)'
子组件方法:    add: function(id) {   this.$emit('事件名'), {id: id , type: '....'}}
父组件接收:    <cart-list @事件名='函数名($event)'></cart-list>
父组件方法:     函数名: function(val) {  val.id  ,   val.type  }
 
<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Document</title>
  <style type="text/css">
    .container {
    }
    .container .cart {
      width: 300px;
      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 src="vue.js" type="text/javascript" charset="utf-8"></script>
  <script type="text/javascript">
    
    var CartTitle = {
        props: ['name'],
      template: `
        <div class="title">{{name}}的商品</div>
      `
    }
    var CartList = {
        props: ['list'],
      template: `
        <div>
          <div class="item" v-for='(item,index) in list' :key='item.id'>
            <div class="name">{{item.name}}</div>
            <div class="change">
              <a href="" @click.prevent='jian(item.id)'></a>
              <input type="text" class="num" :value='item.num' @blur='changeNum(item.id,$event)'/>
              <a href="" @click.prevent='add(item.id)'></a>
            </div>
            <div class="del" @click='del(item.id)'>×</div>
          </div>
        </div>
      `,
      methods: {
          del: function(id){
              // 吧id传给父组件
              this.$emit('cart-del',id)
          },
          changeNum(id,event){
              this.$emit('change-num',{
                  id: id,
                  num: event.target.value,
                  type: 'change'
              })
          },
          jian: function(id) {
              this.$emit('change-num',{
                  id: id,
                  type: 'jian'
              })
          },
          add: function(id) {
            this.$emit('change-num',{
                id: id,
                type: 'add'
            })
          }
      }
    }
    var CartTotal = {
        props: ['list'],
      template: `
        <div class="total">
          <span>总价:{{total}}</span>
          <button>结算</button>
        </div>
      `,
      computed: {
          total: function() {
              var t = 0;
              this.list.forEach(item => t += item.price*item.num);
              return t
          }
      }
    }
    // 购物车整个属于全局组件,但是里面三个组件要定义为购物车的局部组件
    Vue.component('my-cart',{
        data: function() {
            return {
                uname: '战斗',
                list: [{
                  id: 1,
                  name: 'TCL彩电',
                  price: 1000,
                  num: 1,
                  img: 'img/a.jpg'
                },{
                  id: 2,
                  name: '机顶盒',
                  price: 2000,
                  num: 1,
                  img: 'img/b.jpg'
                },{
                  id: 3,
                  name: '海尔冰箱',
                  price: 2000,
                  num: 1,
                  img: 'img/c.jpg'
                },{
                  id: 4,
                  name: '小米手机',
                  price: 5000,
                  num: 1,
                  img: 'img/d.jpg'
                },{
                  id: 5,
                  name: 'PPTV电视',
                  price: 1000,
                  num: 2,
                  img: 'img/e.jpg'
                }]
            }
        },
      template: `
        <div class='cart'>
          <cart-title :name='uname'></cart-title>
          <cart-list :list='list' @cart-del='delCart($event)' @change-num='changeNum($event)'></cart-list>
          <cart-total :list='list'></cart-total>
        </div>
      `,
      // 局部组件
      components: {
        'cart-title': CartTitle,
        'cart-list': CartList,
        'cart-total': CartTotal
      },
      methods: {
          delCart: function(id) {
              var index = this.list.findIndex(item => item.id === id)
              this.list.splice(index,1)
          },
          changeNum(val) {
            if(val.type === 'change'){
                this.list.some(item => {
                    if(item.id === val.id){
                        item.num = val.num
                    }
                })
            } else if(val.type === 'jian'){
                this.list.some(item => {
                    if(item.id === val.id){
                        item.num -=1
                    }
                })
            } else if(val.type === 'add'){
                this.list.some(item => {
                    if(item.id === val.id){
                        item.num += 1
                    }
                })
            }
              
          }
      }
    });
    var vm = new Vue({
      el: '#app',
      data: {

      }
    });

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

 

 
 
 
 
 
 
 
 
 
 
 

 

posted @ 2020-09-04 21:46  登峰至极  阅读(595)  评论(0编辑  收藏  举报