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js實現同一頁面多個運動效果的方法，js實現頁面多個
本文執行個體講述了js實現同一頁面多個運動效果的方法。分享給大家供大家參考。具體分析如下：
實現原理，就是在調用的時候，給這五個元素，迴圈加上事件。需要注意的是，每個元素的定時器需要分開。
要點一：
var speed = (target - obj.offsetWidth)/8;
緩衝運動效果，一開始速度很快，然後越來越慢，直到停止
speed = speed>0?Math.ceil(speed):Math.floor(speed);
如果速度大於0，則向上取整，如果速度小於0，則向下取整。
要點二：
if(obj.offsetWidth == target){clearInterval(obj.timer);}else{obj.style.width = obj.offsetWidth+speed+"px";}
元素寬度和目標值比較，如果相等，關閉定時器，否則，寬度繼續增加。
要點三：
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);}}
給每個元素加上各自的定時器屬性，各自的滑鼠事件，在滑鼠事件中調用運動函數。
最後，上代碼：
<!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>無標題文檔</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 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>
希望本文所述對大家的javascript程式設計有所協助。
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