本文实例讲述了js实现交换运动效果的方法。分享给大家供大家参考。具体分析如下：
实现后的效果，点击互相交换位置和距离左边和上角的信息。
要点一：
var now = s_pic_li[0];
for(var i=0; i<s_pic_li.length; i++){
s_pic_li[i].onclick = function(){
if(this == now) return false;
var w = now.offsetWidth;
var h = now.offsetHeight;
var l = now.offsetLeft;
var t = now.offsetTop;
var w1= this.offsetWidth;
var h1 = this.offsetHeight;
var l1 = this.offsetLeft;
var t1 = this.offsetTop;
startrun(now,{width:w1,height:h1,left:l1,top:t1});
startrun(this,{width:w,height:h,left:l,top:t});
now=this;
}
}
循环给每一块加点击事件，获取交换双方的信息，然后执行运动函数，相关信息做为参数。
最后，上代码：
<!DOCTYPE html>
<html>
<head>
<meta charset="gb2312" />
<title>无标题文档</title>
<style>
<!--
body,ul,li{margin:0; padding:0;
font:18px/1.5 arial; color:#333;}
#big_pic{width:500px; height:400px;
background:#ccc; text-align:center;
position:absolute;}
#s_pic li{float:left; width:100px;
height:80px; display:inline;
background:#06c; text-align:center;
position:absolute; top:310px;}
-->
</style>
<script>
<!--
window.onload = function(){
var s_pic = document.getElementById("s_pic");
var s_pic_li = s_pic.getElementsByTagName("li");
var now = s_pic_li[0];
for(var i=0; i<s_pic_li.length; i++){
s_pic_li[i].onclick = function(){
if(this == now) return false;
var w = now.offsetWidth;
var h = now.offsetHeight;
var l = now.offsetLeft;
var t = now.offsetTop;
var w1= this.offsetWidth;
var h1 = this.offsetHeight;
var l1 = this.offsetLeft;
var t1 = this.offsetTop;
startrun(now,{width:w1,height:h1,left:l1,top:t1});
startrun(this,{width:w,height:h,left:l,top:t});
now=this;
}
}
}
function getstyle(obj,name){
if(obj.currentStyle){
return obj.currentStyle[name];
}else{
return getComputedStyle(obj,false)[name];
}
}
function startrun(obj,json,fn){
clearInterval(obj.timer);
obj.timer = setInterval(function(){
var isall = true;
for(var attr in json){
var cur=0;
if(attr == "opacity"){
cur = Math.round(parseFloat(getstyle(obj,attr))*100);
}else{
cur = parseInt(getstyle(obj,attr));
}
var speed = (json[attr] - cur)/8
speed = speed>0?Math.ceil(speed):Math.floor(speed);
if(cur != json[attr]){
isall = false;
}
if(attr == "opacity"){
obj.style.filter = "alpha(opacity="+(cur+speed)+")";
obj.style.opacity = (cur+speed)/100;
}else{
obj.style[attr] = cur+speed+"px";
}
}
if(isall){
clearInterval(obj.timer);
if(fn){
fn();
}
}
},30);
}
//-->
</script>
</head>
<body>
<ul id="s_pic">
<li style="left:0; top:0; width:400px; height:300px">0</div>
<li style="left:0;">1</li>
<li style="left:110px;">2</li>
<li style="left:220px;">3</li>
<li style="left:330px;">4</li>
</ul>
</body>
</html>
希望本文所述对大家的javascript程序设计有所帮助。
