页面载入时的进度条效果的实现_页面背景特效

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页面载入时的进度条效果的实现,您可以先修改部分代码再运行.

把如下代码加入到<head>区域中.注意:图片自选
<style type="text/css">
#divLoadCont{position:absolute; z-index:500; left:0; top:0; width:100%; height:98%; clip:rect(0,100%,100%,0); background-color:white; layer-background-color:white; }
#divLoad1{position:absolute; layer-background-color:silver; background-color:silver}
#divLoad2{position:absolute; left:0; top:0; layer-background-color:navy; background-color:navy}
#divLoadText{position:absolute; background-color:transparent; font-family:arial,helvetica; color:Navy; font-size:14px; } 
</style>
<script language="JavaScript" type="text/javascript">
function lib_bwcheck(){ //Browsercheck (needed)
    this.ver=navigator.appVersion
    this.agent=navigator.userAgent
    this.dom=document.getElementById?1:0
    this.opera5=this.agent.indexOf("Opera 5")>-1
    this.ie5=(this.ver.indexOf("MSIE 5")>-1 && this.dom && !this.opera5)?1:0; 
    this.ie6=(this.ver.indexOf("MSIE 6")>-1 && this.dom && !this.opera5)?1:0;
    this.ie4=(document.all && !this.dom && !this.opera5)?1:0;
    this.ie=this.ie4||this.ie5||this.ie6
    this.mac=this.agent.indexOf("Mac")>-1
    this.ns6=(this.dom && parseInt(this.ver) >= 5) ?1:0; 
    this.ns4=(document.layers && !this.dom)?1:0;
    this.bw=(this.ie6 || this.ie5 || this.ie4 || this.ns4 || this.ns6 || this.opera5)
    return this
}
var bw=new lib_bwcheck()
numImages=10 //How many images you have in your page
loaderWidth=300 //The width of the loadbar

currentImg=0
function lib_doc_size(){ 
  this.x=0;this.x2=bw.ie && document.body.offsetWidth-20||innerWidth||0;
  this.y=0;this.y2=bw.ie && document.body.offsetHeight-5||innerHeight||0;
  if(!this.x2||!this.y2) return message('Document has no width or height') 
  this.x50=this.x2/2;this.y50=this.y2/2;
  return this;
}
function lib_obj(obj,nest){ 
  nest=(!nest) ? "":'document.'+nest+'.'
  this.evnt=bw.dom? document.getElementById(obj):bw.ie4?document.all[obj]:bw.ns4?eval(nest+"document.layers." +obj):0;    
  this.css=bw.dom||bw.ie4?this.evnt.style:this.evnt; 
  this.ref=this.css
  this.w=this.evnt.offsetWidth||this.css.clip.width||
    this.ref.width||this.css.pixelWidth||0; 
  return this
}
lib_obj.prototype.moveIt = function(x,y){
  this.x=x;this.y=y; this.css.left=x;this.css.top=y
}
lib_obj.prototype.clipTo = function(t,r,b,l,setwidth){ 
  this.ct=t; this.cr=r; this.cb=b; this.cl=l
  if(bw.ns4){
    this.css.clip.top=t;this.css.clip.right=r
    this.css.clip.bottom=b;this.css.clip.left=l
  }else{
    if(t<0)t=0;if(r<0)r=0;if(b<0)b=0;if(b<0)b=0
    this.css.clip="rect("+t+","+r+","+b+","+l+")";
    if(setwidth){this.css.pixelWidth=this.css.width=r; 
    this.css.pixelHeight=this.css.height=b}
  }
}
var oLoad2
function startLoading(){
  page=new lib_doc_size()
  oLoadCont=new lib_obj('divLoadCont')
  oLoad=new lib_obj('divLoad1','divLoadCont')
  oLoad2=new lib_obj('divLoad2','divLoadCont.document.divLoad1')
  oLoadText=new lib_obj('divLoadText','divLoadCont.document.divLoad1')
  oLoad.moveIt(page.x50-loaderWidth/2,page.y50-20)
  oLoadText.moveIt(loaderWidth/2 - oLoadText.w/2,10)
  oLoad.clipTo(0,loaderWidth,40,0,1)
  oLoad2.per = loaderWidth/numImages
}
function loadIt(ok){
  currentImg++
  if(oLoad2) oLoad2.clipTo(0,oLoad2.per*currentImg,40,0,1)
  if(!ok){
    oLoadCont.css.visibility='hidden'
    oLoadCont=null; oLoad1=null; oLoad2=null;
  }
}
function loadIt_display(ok){
  currentImg++
  if(oLoad2) oLoad2.clipTo(0,oLoad2.per*currentImg,40,0,1)
  if(currentImg<=numImages) setTimeout("loadIt_display(1)",200)
  else{
    oLoadCont.css.visibility='hidden'
  }
}
</script>
<div id="divLoadCont">
  <div id="divLoad1">
    <div id="divLoad2"></div><br>
    <div id="divLoadText">Loading...</div>
  </div>
</div>
<script>
startLoading()
//onload=loadIt; //- LEAVE THIS LINE WHILE TESTING. UNCOMMENT WHEN READY
loadIt_display(1) //LEAVE THIS LINE WHILE TESTING. DELETE WHEN READY
</script>

所属频道：页面背景特效/更新时间：2010-05-23

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