VueDemo.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Vue demo 跑马灯效果</title>
    <style>
        [v-cloak] {
            display: none;
        }
    </style>
</head>
<body>

<div id="app">
    <input type="button" value="跑起来" id="btn1" @click="lang">
    <input type="button" value="stop" id="btn2" @click="stop">
    <br>
    <h4>{{msg}}</h4>
</div>

<div id="div1">
    <input type="button" value="跑起来" id="btn3" @click="lang">
    <input type="button" value="stop" id="btn4" @click="stop">
    <br>
    <h4>{{msg}}</h4>
</div>

<!-- 先引入 Vue 【https://unpkg.com/vue@2.6.10/dist/vue.js】 -->
<script src="https://unpkg.com/vue/dist/vue.js"></script>

<script>
    var wm = new Vue({
            //el: "#div1",
            data: {
                msg: "昨天爱你，今天爱你，明天依然爱你！我的vue ! ~LC ",
                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;
                }
            }
        }
    )//.$mount("#div1");

    //或者使用
    wm.$mount("#app");  //也可以
</script>
</body>
</html>