<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>运动框架-匀速运动</title>
<style type="text/css">
.div {
width: 100px;
height: 100px;
background-color: chartreuse;
margin-top: 20px;
position: relative;
left: 0;
top: 0;
}
</style>
<script type="text/javascript">
var timer = null;
function start() {
var oBtn = document.getElementById('btn');
var oDiv = document.getElementById('div');
//1
clearInterval(timer);
timer = setInterval(function() {
var speed = 1;
//2
if(oDiv.offsetLeft >= 1100) {
clearInterval(timer);
}
else{
oDiv.style.left = oDiv.offsetLeft + speed + 'px';
}
}, 30)
}
</script>
</head>
<body>
<input type="button" id="btn" value="运动" onclick="start()" />
<div class="div" id="div"></div>
<p>关键点:1:清除定时器,2:if/else判断</p>
</body>
</html>
学习路径:智能社的开发教程:https://ke.qq.com/webcourse/index.html#course_id=152997&term_id=100174752&taid=766913655494053&vid=v14127nxshc