本文實例講述了js實現交換運動效果的方法。分享給大家供大家參考。具體分析如下：
實現后的效果，點擊互相交換位置和距離左邊和上角的信息。
要點一：
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;}}循環給每一塊加點擊事件，獲取交換雙方的信息，然后執行運動函數，相關信息做為參數。
最后，上代碼：
<!DOCTYPE html><html><head><meta charset="gb2312" /><title>無標題文檔</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>希望本文所述對大家的javascript程序設計有所幫助。
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