036-缓冲效果.html

<!DOCTYPE HTML>
<html>
<head>
<meta charset="utf-8" />
<title></title>
<style>
#div1{width:100px; height:100px; background:red; position:absolute; left:0; top:50px;}
</style>
<script>
var timer = null;
function startMove(iTarget)
{
	var oDiv1 = document.getElementById("div1");
	clearInterval(timer);
	timer = setInterval(function(){
		var ispeed = (iTarget - oDiv1.offsetLeft) / 24;
		ispeed = ispeed > 0 ? Math.ceil(ispeed):Math.floor(ispeed);
		if(oDiv1.offsetLeft >= iTarget)
		{
			clearInterval(timer);
		}
		else
		{
			oDiv1.style.left = oDiv1.offsetLeft + ispeed + "px";
		}
	},30)
}
</script>
</head>
<body>
<input type="button" onclick="startMove(300)" value="开始移动" />
<div id="div1"></div>
</body>
</html>