跑马灯案例：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<div id="app">
<input type="button" value="浪起来" @click="strat" :disabled="this.clearInt!=null">
<input type="button" value="低调" @click="end" :disabled="this.clearInt==null">
<div>{{data}}</div>
</div>
</body>
<script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
<script>
var vm = new Vue({
el: "#app",
data: {
data: "好好学习，天天向上，，，oooooo",
clearInt: null,
// dis: this.clearInt!=null
},
methods: {
strat() {
clearInterval(this.clearInt)
this.clearInt = setInterval(() => {
// this.data = this.data.substr(1) + this.data.substr(0, 1)
// this.data = this.data.substring(1) + this.data.substring(0, 1)
this.data = this.data.slice(1) + this.data.slice(0, 1)
}, 300);
},
end() {
clearInterval(this.clearInt);
this.clearInt = null;
}
}
})
</script>
</html>