用CSS+JS制作进度条(二)

2012-11-09 来源：网络

【实例名称】

用CSS+JS制作进度条(二)

【实例描述】

本例学习如何使用CSS+JavaScript的方式实现常见的进度条。

【实例代码】

<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
<title>标题页-学无忧（www.xue51.com）</title>
</head>
<body>
<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 pro_bwcheck(){                     
//检测浏览器的代码-通用
    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.ie7 || this.ie6 || this.ie5 || 
this.ie4 || this.ns4 || this.ns6 || this.opera5)
    return this
}
var bw=new pro_bwcheck()
numImages=12                       
//默认10个图片
loaderWidth=350                    
//设置进度条的宽度
currentImg=0
function pro_doc_size(){           
//判断显示区域
  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('窗体的宽度和高度不够！') 
  this.x50=this.x2/2;this.y50=this.y2/2;
  return this;
}
function pro_obj(obj,nest){            
//定义页面中承载进度条的控件属性
  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
}
pro_obj.prototype.moveIt = function(x,y){              
//定义移动方法
  this.x=x;this.y=y; this.css.left=x;this.css.top=y
}
pro_obj.prototype.clipTo = function(t,r,b,l,setwidth){ 
//重新定义裁剪方法
  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 pro_doc_size()
  //以下设置加载控件的一些基本属性
  oLoadCont=new pro_obj('divLoadCont')
  oLoad=new pro_obj('divLoad1','divLoadCont')
  oLoad2=new pro_obj('divLoad2','
divLoadCont.document.divLoad1')
  oLoadText=new pro_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)   //裁剪区域
  oLoad2.per = loaderWidth/numImages   //百分比
}
function loadIt_display(ok){
  currentImg++
  if(oLoad2) oLoad2.clipTo(0,oLoad2.per*currentImg,40,0,1)       
//裁剪显示的区域
  if(currentImg<=numImages) setTimeout("loadIt_display(1)",200)  
//使用定时器不断加载图片
  else{
    oLoadCont.css.visibility='hidden'                            
//进度条加载完成后隐藏
  }
}
</script>
<div id="divLoadCont">
  <div id="divLoad1">
    <div id="divLoad2"></div><br>
    <div id="divLoadText">页面加载中，请稍候...</div>
  </div>
</div>
<script>
    startLoading()
    loadIt_display(1)
</script> 
</body>
</html>

【运行效果】

用CSS+JS制作进度条(二)运行效果