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js实现同一页面多个运动效果的方法_javascript技巧

WBOY
WBOYOriginal
2016-05-16 16:04:521086browse

本文实例讲述了js实现同一页面多个运动效果的方法。分享给大家供大家参考。具体分析如下:

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&#63;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 id="runs">
 <li style="top:0">1</li>
 <li style="top:90px;">2</li>
 <li style="top:180px;">3</li>
 <li style="top:270px;">4</li>
 <li style="top:360px;">5</li>
</ul>
</body>
</html>

希望本文所述对大家的javascript程序设计有所帮助。

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