js写进度条

<script language="javascript">
// Timer Bar - Version 1.0
// Author: Brian Gosselin of http://scriptasylum.com
// Script featured on http://www.dynamicdrive.com

var loadedcolor='darkgray' ;       // PROGRESS BAR COLOR
var unloadedcolor='lightgrey';     // COLOR OF UNLOADED AREA
var bordercolor='navy';            // COLOR OF THE BORDER
var barheight=15;                  // HEIGHT OF PROGRESS BAR IN PIXELS
var barwidth=300;                  // WIDTH OF THE BAR IN PIXELS
var waitTime=5;                   // NUMBER OF SECONDS FOR PROGRESSBAR

// THE FUNCTION BELOW CONTAINS THE ACTION(S) TAKEN ONCE BAR REACHES 100%.
// IF NO ACTION IS DESIRED, TAKE EVERYTHING OUT FROM BETWEEN THE CURLY BRACES ({})
// BUT LEAVE THE FUNCTION NAME AND CURLY BRACES IN PLACE.
// PRESENTLY, IT IS SET TO DO NOTHING, BUT CAN BE CHANGED EASILY.
// TO CAUSE A REDIRECT TO ANOTHER PAGE, INSERT THE FOLLOWING LINE:
// window.location="http://redirect_page.html";
// JUST CHANGE THE ACTUAL URL OF COURSE :)

var action=function()
{
alert("52515.net欢迎你！");
//window.location="http://www.dynamicdrive.com
}

//*****************************************************//
//**********  DO NOT EDIT BEYOND THIS POINT  **********//
//*****************************************************//

var ns4=(document.layers)?true:false;
var ie4=(document.all)?true:false;
var blocksize=(barwidth-2)/waitTime/10;
var loaded=0;
var Pbouter;
var Pbdone;
var PBbckgnd;
var Pid=0;
var txt='';
if(ns4){
txt+='<table border=0 cellpadding=0 cellspacing=0><tr><td>';
txt+='<ilayer name="Pbouter" visibility="hide" height="'+barheight+'" width="'+barwidth+'" onmouseup="hidebar()">';
txt+='<layer width="'+barwidth+'" height="'+barheight+'" bgcolor="'+bordercolor+'" top="0" left="0"></layer>';
txt+='<layer width="'+(barwidth-2)+'" height="'+(barheight-2)+'" bgcolor="'+unloadedcolor+'" top="1" left="1"></layer>';
txt+='<layer name="Pbdone" width="'+(barwidth-2)+'" height="'+(barheight-2)+'" bgcolor="'+loadedcolor+'" top="1" left="1"></layer>';
txt+='</ilayer>';
txt+='</td></tr></table>';
}else{
txt+='<div id="Pbouter" onmouseup="hidebar()" style="position:relative; visibility:hidden; background-color:'+bordercolor+'; width:'+barwidth+'px; height:'+barheight+'px;">';
txt+='<div style="position:absolute; top:1px; left:1px; width:'+(barwidth-2)+'px; height:'+(barheight-2)+'px; background-color:'+unloadedcolor+'; font-size:1px;"></div>';
txt+='<div id="Pbdone" style="position:absolute; top:1px; left:1px; width:0px; height:'+(barheight-2)+'px; background-color:'+loadedcolor+'; font-size:1px;"></div>';
txt+='</div>';
}

document.write(txt);

function incrCount(){
window.status="Loading…";
loaded++;
if(loaded<0)loaded=0;
if(loaded>=waitTime*10){
clearInterval(Pid);
loaded=waitTime*10;
setTimeout('hidebar()',100);
}
resizeEl(Pbdone, 0, blocksize*loaded, barheight-2, 0);
}

function hidebar(){
clearInterval(Pid);
window.status='';
//if(ns4)Pbouter.visibility="hide";
//else Pbouter.style.visibility="hidden";
action();
}

//THIS FUNCTION BY MIKE HALL OF BRAINJAR.COM
function findlayer(name,doc){
var I,layer;
for(I=0;I<doc.layers.length;I++){
layer=doc.layers[I];
if(layer.name==name)return layer;
if(layer.document.layers.length>0)
if((layer=findlayer(name,layer.document))!=null)
return layer;
}
return null;
}

function progressBarInit(){
Pbouter=(ns4)?findlayer('Pbouter',document):(ie4)?document.all['Pbouter']:document.getElementById('Pbouter');
Pbdone=(ns4)?Pbouter.document.layers['Pbdone']:(ie4)?document.all['Pbdone']:document.getElementById('Pbdone');
resizeEl(Pbdone,0,0,barheight-2,0);
if(ns4)Pbouter.visibility="show";
else Pbouter.style.visibility="visible";
Pid=setInterval('incrCount()',95);
}

function resizeEl(id,t,r,b,l){
if(ns4){
id.clip.left=l;
id.clip.top=t;
id.clip.right=r;
id.clip.bottom=b;
}else id.style.width=r+'px';
}

window.onload=progressBarInit;

</script>
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