<!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>Document</title>
<script src="https://cdn.bootcss.com/vue/2.6.10/vue.js"></script>
</head>
<style>
</style>
<body>
<div id="app">
<P>{{msg}}</P>
<button @click='runing'>点击</button>
<button @click='stop'>停止</button>
</div>
<script>
var vm= new Vue({
el:'#app',
data:{
msg:'这是一句话',
timer:null
},
methods: {
runing(){
if(this.timer != null){return }
this.timer=setInterval(() => {
var start=this.msg.substring(0,1)
var end =this.msg.substring(1)
this.msg=end+start
}, 200);
},
stop(){
clearInterval(this.timer)
this.timer=null
}
}
})
</script>
</body>
</html>