js进度条实例

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jsp页面代码：test.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%
    String path = request.getContextPath();
    String basePath = request.getScheme() + "://"
            + request.getServerName() + ":" + request.getServerPort()
            + path + "/";
%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
<base href="<%=basePath%>">
<script type="text/javascript" src="<%=basePath%>js/loading.js"></script>
</head>
<body>
<input type="button" name="Button" value="Button" onclick="Loading('loading', '<%=basePath%>js/', 80, 80)">
<div id="loading_div" ></div>

</body>
</html>

js代码：loading.js

//频率
var frequency = 50;
//步长
var step = 3;
//背景颜色
var loadingBgcolor = "#FFFFEC";
//宽度
var loadingWidth = 354;

/*
*参数说明:
*content：显示内容，可以为空；
*imageURL：将引用JS文件的路径设置即可；
*left：进度条显示位置left
*top：进度条显示位置top
*/
function Loading(content, imageURL, left, top)
{
imageURL = imageURL + "Loading.jpg";

LoadTable(content, imageURL, left, top);
showimage.style.display="";
window.setInterval("RefAct();", frequency);
}

function RefAct()
{
imgAct.width += step;
if(imgAct.width > loadingWidth-4)
{
imgAct.width = 0;
}
}

function LoadTable(content, imageURL, left, top)
{
var strLoading;
strLoading = "";
strLoading += "<div id=\"showimage\" style=\"DISPLAY:none;Z-INDEX:100;LEFT:" + left+ "px;POSITION:absolute;TOP:" + top+ "px;\" align=\"center\">";
strLoading += "<TABLE id=\"Table1\" cellSpacing=\"0\" cellPadding=\"0\" width=\"" + loadingWidth + "\" border=\"0\" bgcolor=\"" + loadingBgcolor+ "\">";
if(content != "")
{
   strLoading += "<tr>";
    strLoading += "<td align=\"center\">";
     strLoading += "<font size=\"4\" face=\"Courier New, Courier, mono\"><strong>" + content + "</strong></font>";
    strLoading += "</td>";
   strLoading += "</tr>";
   strLoading += "<TR>";
}
    strLoading += "<TD class=\"Loading\" height=\"8\">";
     strLoading += "<IMG id=\"imgAct\" height=\"8\" alt=\"\" src=\"" + imageURL + "\" width=\"0\">";
    strLoading += "</TD>";
   strLoading += "</TR>";
strLoading += "</TABLE>";
strLoading += "</div>";

document.getElementById("loading_div").innerHTML = strLoading;
}