点击浪起来，下面的文字会滚动，点击低调，则会停止滚动
<html>
<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></title>
<script src="Vue.min.js"></script>
<style>
</style>
</head>
<body>
<div id="app">
<input type="button" value="浪起来" @click="lang">
<input type="button" value="低调" @click="stop">
<h4>{{msg}}</h4>
</div>
<script>
var vm = new Vue({
el: '#app',
data: {
msg: '猥琐发育，别浪~~~！',
intervaId: null
},
methods: {
lang() {
if (this.intervaId != null) return;
this.intervaId = setInterval(() => { //箭头函数可以解决this变化的问题
var start = this.msg.substring(0, 1);
var end = this.msg.substring(1);
this.msg = end + start;
}, 400)
},
stop() {
clearInterval(this.intervaId);
this.intervaId = null;
}
},
})
</script>
</body>
</html>