垂直置中層 js操作css

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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">//這個一定要加 因為ie8  xhtml4.0不支援fixed  如果第一個層高度超過瀏覽器高度 也就是有捲軸  imgdiv是不隨捲軸滾動而滾動,它一直都在那裡<body id="gn" ></body><script language="javascript"> function $$(titleName) {    return document.createElement(titleName); }function $(e){    return document.getElementById(e);}var lodingBox = $$("div");lodingBox.style.position="fixed";lodingBox.style.width=screen.width+"px";        lodingBox.style.height=screen.height+"px";        lodingBox.style.backgroundColor="#cccccc";        lodingBox.id="lodingBox";var imgdiv=$$("div");var imgdiv_width="300";var imgdiv_height="100";var imfdiv_left=screen.width-screen.width/2-imgdiv_width/2;//為什麼要減去100px//我也不知道為什麼 因為這樣算出來上邊高底下低所以我就再減去100pxvar imfdiv_height=screen.height-screen.height/2-imgdiv_height/2-100;imgdiv.style.position="fixed";imgdiv.style.left=imfdiv_left+"px";imgdiv.style.top=imfdiv_height+"px";imgdiv.style.width=imgdiv_width+"px";imgdiv.style.height=imgdiv_height+"px";        imgdiv.style.backgroundColor="red";        imgdiv.id="imgdiv";        var lodingImg=$$("img");        lodingImg.src="loadingmin.gif";        var lodingText=$$("span");        lodingText.innerHTML="正在存入資料,請稍候....";                imgdiv.appendChild(lodingImg);        imgdiv.appendChild(lodingText);        $("gn").appendChild(lodingBox);       $("gn").appendChild(imgdiv); var temp=1;         zheli(10);       // $("lodingBox").style.display="none"; //$("imgdiv").style.display="none";function zheli(n){if(n==1){return temp;}temp=temp*n;//document.write(temp+"<br />");//遞迴zheli(n-1);}</script>

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