请老师检查作业
来源：3-13 编程练习
鱼档卖鱼
2022-05-17 17:39:19
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<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')
// 方法一：更改this指向
// var show = {
// content: "Hello World ",
// timer: null,
// start: function () {
// let that = this;
// startBtn.onclick = function () {
// clearInterval(that.timer);
// that.timer = setInterval(function () {
// box.innerHTML += that.content;
// }, 1000);
// }
// },
// stop: function () {
// let that = this;
// stopBtn.onclick = function () {
// clearInterval(that.timer)
// }
// },
// }
// show.start();
// show.stop();
// 方法二：箭头函数
var show = {
content: "Hello World ",
timer: null,
start: function () {
startBtn.onclick = () => {
clearInterval(this.timer);
this.timer = setInterval(() => {
box.innerHTML += this.content;
}, 1000);
}
},
stop: function () {
stopBtn.onclick = () => {
clearInterval(this.timer)
}
},
}
show.start();
show.stop();
</script>
</body>
</html>
1回答
-
好帮手慕星星
2022-05-17
同学你好，这两种方法都是正确的，很棒！祝学习愉快~
0
