1、实现元素匀速运动
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<style type="text/css">
#cicle {
width: 20px;
height: 20px;
border-radius: 50%;
background-color: #8c0000;
position: absolute;
top: 50px;
}
</style>
</head>
<body>
<button id="btn" οnclick="move()">匀速运动</button>
<div id="cicle"></div>
</body>
<script>
function move() {
var cicle = document.getElementById("cicle");
var num=0;
var target=400;
var timer= setInterval(function(){
if(num<=400){
num+=5;//元素匀速运动 <pre name="code" class="html"> num=num+(target-num)/100;//元素缓速运动（先快后慢） cicle.style.left=num+"px"; }else { clearInterval(timer); } },10); }</script></html>
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