代碼：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>跑馬燈</title>
<script src="https://unpkg.com/vue/dist/vue.js"></script>
</head>
<body>
<div id="app">
<input type="button" value="浪起來" @click="lang">
<input type="button" value="低調" @click="stop">
<h4>{{msg}}</h4>
</div>
<script>
var vm = new Vue({
el: '#app',
data: {
msg: '猥瑣發育，別浪~！一直循環吧',
intervalId: null
},
methods: {
lang() {
if (this.intervalId != null) return;
this.intervalId = setInterval(() => {
var start = this.msg.substring(0, 1);
var end = this.msg.substring(1);
this.msg = end + start;
}, 400)
},
stop() {
clearInterval(this.intervalId);
this.intervalId = null;
}
}
})
</script>
</body>
</html>
解析：
