<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>匀速运动结束条件</title>
<style type="text/css">
#div{
100px;
height: 100px;
background: red;
position: absolute;
top:50px;
left: 0px;
}
</style>
<script type="text/javascript">
window.onload=function(){
var oBtn=document.getElementById("btn");
var oDiv=document.getElementById("div");
var oBtn2=document.getElementById("btn2");
oBtn.onclick=function(){//前进
move(oDiv,509);
};
oBtn2.onclick=function(){//后退
move(oDiv,20);
};
var oTimer=null;//定时器
function move(obj,iTarget){//运动函数：obj:运动对象，iTarget运动的距离
clearInterval(oTimer);
oTimer=setInterval(function(){
var iSpeed=0;//速度
if (iTarget>obj.offsetLeft) {
iSpeed=12;
}else{
iSpeed=-12;
};
if (Math.abs(obj.offsetLeft-iTarget)<10) {
clearInterval(oTimer);
obj.style.left=iTarget+"px";//处理匀速运动前后差距
} else{
obj.style.left=obj.offsetLeft+iSpeed+"px";//运动
};
},30);
}
};
</script>
</head>
<body>
<input type="button" id="btn" value="forward move" />
<input type="button" id="btn2" value="back move" />
<div id="div">
</div>
</body>
</html>