(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>
知识兔