js实现同一页面多个运动效果的方法

实现原理,就是在调用的时候,给这五个元素,循环加上事件。需要注意的是,每个元素的定时器需要分开。

要点一:

var speed = (target - obj.offsetWidth)/8;

缓冲运动效果,一开始速度很快,然后越来越慢,直到停止

speed = speed>0?Math.ceil(speed):Math.floor(speed);

如果速度大于0,则向上取整,如果速度小于0,则向下取整。

要点二:

if(obj.offsetWidth == target){ clearInterval(obj.timer); }else{ obj.style.width = obj.offsetWidth+speed+"px"; }

元素宽度和目标值比较,如果相等,关闭定时器,否则,宽度继续增加。

要点三:

for(i=0; i<runs_li.length; i++){ runs_li[i].timer = null; runs_li[i].onmouseover = function(){ startrun(this,300); } runs_li[i].onmouseout = function(){ startrun(this,80); } }

给每个元素加上各自的定时器属性,各自的鼠标事件,在鼠标事件中调用运动函数。

最后,上代码:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>无标题文档</title> <style> body,ul,li{margin:0; padding:0;} #runs li{width:80px; height:80px; background:#06c; list-style:none; position:absolute; left:0;} </style> <script> window.onload = function(){ var runs = document.getElementById("runs"); var runs_li = runs.getElementsByTagName("li"); var i=0; for(i=0; i<runs_li.length; i++){ runs_li[i].timer = null; runs_li[i].onmouseover = function(){ startrun(this,300); } runs_li[i].onmouseout = function(){ startrun(this,80); } } } function startrun(obj,target){ clearInterval(obj.timer); obj.timer = setInterval(function(){ var speed = (target - obj.offsetWidth)/8; speed = speed>0?Math.ceil(speed):Math.floor(speed); if(obj.offsetWidth == target){ clearInterval(obj.timer); }else{ obj.style.width = obj.offsetWidth+speed+"px"; } document.title = obj.offsetWidth + ',' + target; },30); } </script> </head> <body> <ul> <li>1</li> <li>2</li> <li>3</li> <li>4</li> <li>5</li> </ul> </body> </html>

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