组件通信 $ref

(1)放在dom上表示获取当前dom元素,

(2)放到组件上表示获取当前组件实例

(3)在v-for中获取的是集合

<!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>组件通信 ref</title>
    <script src="./node_modules/vue/dist/vue.js"></script>
</head>
<body>
    <div id="app">
        <parent ref="parent"></parent>
    </div>
</body>
<script>
    Vue.component('parent',{
     template:`<div><span v-if="isShow">hello world</span></div>`,
     data() {
       return {
          isShow:false
       }
     },
     methods: {
        Show() {
             this.isShow = true;
        }
     },
   })
   let  vm = new Vue({
         el:'#app',
         mounted() {
            //  console.log(this.$refs.parent.Show())
            setTimeout(()=>{
                this.$refs.parent.Show()
            },2000)
         },
   })
   //hello
</script>
</html>

 

 

posted @ 2019-09-18 10:06  1点  阅读(233)  评论(0编辑  收藏  举报