<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<style>
* {
margin: 0;
padding: 0;
}
.box {
width: 100px;
height: 100px;
background-color: pink;
position: absolute;
left: 0;
top: 100px;
}
</style>
</head>
<body>
<button id="btn">move</button>
<div class="box"></div>
<script>
var btn = document.getElementById('btn');
var odiv = document.getElementsByTagName('div')[0];
var timer = null;//初始化一个定时器
var num = 0;
// 点击按钮让odiv向右做匀速运动
btn.onclick = function(){
clearInterval(timer);//防止重复点击造成定时器的紊乱
timer = setInterval(move,20);
}
function move(){
num+=5;
if(num>600){//此处如果是>=600那么实际运动的距离其实是595px
clearInterval(timer);
}else{
odiv.style.left = num+'px';
}
}
</script>
</body>
</html>
如图
image.png
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