javascript实现简单的进度条

示例一：

<!doctype html>
<html>
<head>
<meta charset="utf8">
<title>Process Bar</title>
<script>
var t;
 
function s(c)
{
  if(c<=100)
  {
    val.style.width=c+"%";
    percent.innerHTML=c+"%";
    btn.disabled=true;
    btnp.disabled=false;
    c=c+10;
    t=setTimeout("s("+c+")",500);
  }
  else
  {
    clearTimeout(t);
    btnc.disabled=false;
    btnp.disabled=true;
    return;
  }
}
 
function c()
{
  clearTimeout(t);
  val.style.width="0px";
  percent.innerHTML="0%";
  btn.disabled=false;
  btnc.disabled=true;
  btnp.disabled=true;
  btnp.value='Pause';
}
 
function p()
{
  var temp;
  if('Pause' == btnp.value)
  {
    clearTimeout(t);
    btnp.value='Go on';
    btnc.disabled=false;
  }
  else
  {
    temp=val.style.width;
    btnp.value='Pause';
    var k=parseInt(delEnd(temp));
    s(k);
    btnc.disabled=true;
  }  
}
 
function delEnd(str)
{
  var temp="";
  for(var i=0; i < str.length-1; i++)
 
  {
    temp=temp+str[i];
  }
 
  return temp;
 
}
</script>
</head>
 
<body>
<div id="bar" style="width:300px; height:30px; border:solid 1px; float:left;">
 <div id="val" style="height:100%; background-color:#03F; width:0px;"></div>
</div>
<div id="percent" style="float:left; line-height:30px;">0%</div>
<div style="clear:both"></div>
<br />
<input id="btn" type="button" value="Start" onClick="s(0)" />
<br />
<input id="btnc" type="button" value="Clear" onClick="c()" disabled />
<br />
<input id="btnp" type="button" value="Pause" onClick="p()" disabled />
</body>
</html>

再来分享一个结合.net的

建立一个WEB工程，添加新项->HTML页面，命名为ProgressBar.htm，内容如下：

<!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" id="mainWindow">
<head>
  <title>无标题页</title>
  <script language="javascript">
    function SetPorgressBar(pos)
    {
      //设置进度条居中
      var screenHeight = window["mainWindow"].offsetHeight;
      var screenWidth = window["mainWindow"].offsetWidth;
      ProgressBarSide.style.width = Math.round(screenWidth / 2);
      ProgressBarSide.style.left = Math.round(screenWidth / 4);
      ProgressBarSide.style.top = Math.round(screenHeight / 2);
      ProgressBarSide.style.height = "21px";
      ProgressBarSide.style.display = "";
        
      //设置进度条百分比            
      ProgressBar.style.width = pos + "%";
      ProgressText.innerHTML = pos + "%";
    }
 
    //完成后隐藏进度条
    function SetCompleted()
    {    
      ProgressBarSide.style.display = "none";
    }
   </script> 
</head>
  <body>
  <div id="ProgressBarSide" style="position:absolute;height:21x;width:100px;color:Silver;border-width:1px;border-style:Solid;display:none">
    <div id="ProgressBar" style="position:absolute;height:21px;width:0%;background-color:#3366FF"></div>
    <div id="ProgressText" style="position:absolute;height:21px;width:100%;text-align:center"></div>
  </div>
  </body>
</html>

后台代码，Default.aspx.cs：

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Threading;
using System.IO;
 
public partial class _Default : System.Web.UI.Page 
{
  private void beginProgress()
  {
    //根据ProgressBar.htm显示进度条界面
    string templateFileName = Path.Combine(Server.MapPath("."), "ProgressBar.htm");
    StreamReader reader = new StreamReader(@templateFileName,System.Text.Encoding.GetEncoding("GB2312"));
    string html = reader.ReadToEnd();
    reader.Close();
    Response.Write(html);
    Response.Flush();
  }
 
  private void setProgress(int percent)
  {
    string jsBlock = "<script>SetPorgressBar('" + percent.ToString() + "'); </script>";
    Response.Write(jsBlock);
    Response.Flush();
  }
 
  private void finishProgress()
  {
    string jsBlock = "<script>SetCompleted();</script>";
    Response.Write(jsBlock);
    Response.Flush();
  }
 
  private void Page_Load(object sender, System.EventArgs e) 
  {
    beginProgress();
 
    for (int i = 1; i <= 100; i++)
    {
      setProgress(i);
 
      //此处用线程休眠代替实际的操作，如加载数据等
      System.Threading.Thread.Sleep(50);
    }
 
    finishProgress(); 
  } 
}