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来源：3-13 编程练习

Lanny_Chung

2022-04-21 11:57:27

<!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>
        const startBtn = document.getElementById('start')
        const stopBtn = document.getElementById('stop')
        const box = document.getElementById('box')
        var show = {
            content: "Hello World",
            timer: null,
            start: function () {
                // 在此补充代码
                startBtn.onclick = () => {
                    this.timer = setInterval(() => {
                        this.content += " Hello World";
                        box.innerHTML = this.content;
                    }, 1000);

                }
            },
            // 在此补充代码
            stop:function(){
                stopBtn.onclick = ()=>{
                    clearInterval(this.timer);
                }
            }
        }
        // 在此补充代码
        show.start();
        show.stop();
    </script>
</body>

</html>

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