我对里面的this指向还不是特别明白，老师指点一下下

来源：3-13 编程练习

卷毛奋斗中

2022-05-25 10:22:15

<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <title>Document</title>
    <style>
        div {
            width: 300px;
            margin: 20px 0;
            line-height: 30px;
            background: yellowgreen;
        }
    </style>
</head>
<body>
    <button id="start">开始</button>
    <button id="stop">停止</button>
    <div id="box"></div>
    <script>
         // 在此补充代码
         //获取元素
        let startBtn = document.querySelector('#start');
        let stopBtn = document.querySelector('#stop');
        let box = document.querySelector('#box');
        const show = {
            content:'Hello World',
            time: 0,
            start:function(){
                startBtn.addEventListener('click',() => {
                    this.timer = setInterval(() => {
                        box.innerHTML += `${this.content}`
                    },1000);
                },false);
            },
            stop:function(){
                stopBtn.addEventListener('click',() => {
                    clearInterval(this.timer);
                },false);
            }
        }
        show.start();
        show.stop();
    </script>
</body>
</html>

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