js 蒙版进度条（结合图片）

/******************** 
** js 蒙版进度条（图片） 
** [e-mail] 
** 2009-12-03 
*********************/ //禁止网页后退 
window.history.forward(1); 
document.attachEvent("onkeydown",docKeyDown); 
function docKeyDown() { 
//屏蔽退格删除键 
if (window.event.keyCode == 8) { 
if(window.event.srcElement.type != "text" 
&& window.event.srcElement.type != "textarea" 
&& window.event.srcElement.type != "password") { 
window.event.keyCode = 0x0; 
return false; 
} else if(window.event.srcElement.readOnly) { 
window.event.keyCode = 0x0; 
return false; 
} 
} 
} 

//加载进度条 
var process_submit_doing = false; 
try { 
window.attachEvent("onload",doBodyLoad); 
//document.attachEvent("onclick",doProcess); 
window.attachEvent("onbeforeunload",doWinLoad); 
} catch(e) { 
document.addEventListener("onclick",doProcess,false); 
window.addEventListener("onbeforeunload",doWinLoad,false); 
} 
// 
function doBodyLoad() { 
var obj; 
var vInput=document.getElementsByTagName("INPUT"); 
for(var i in vInput) { 
obj=vInput[i]; 
if(obj.type=="button" || obj.type=="submit") { 
obj.attachEvent("onclick",doProcess); 
} 
} 
vInput=document.getElementsByTagName("IMG"); 
for(var i in vInput) { 
obj=vInput[i]; 
if(undefined != obj.alt) { 
obj.attachEvent("onclick",doProcess); 
} 
} 
} 
// 
function doWinLoad() { 
process_submit_doing = true; 
} 
// 
function doProcess() { 
//是否正在提交 
if(!process_submit_doing) { 
return; 
} 
// 
var showProcess = false; 
//捕获事件源 
var eventObj = event.srcElement; 
var btnvalue = ""; 
if(eventObj.tagName=='INPUT') { 
btnvalue = eventObj.value; 
} else if(eventObj.tagName=='IMG') { 
if(null != eventObj.alt && "" != eventObj.alt) { 
btnvalue = eventObj.alt; 
} else { 
btnvalue = eventObj.title; 
} 
} 
btnvalue = btnvalue.replace(/ */g,"").replace(/　*/g,""); 
// 
var my_array = new Array(); 
my_array.unshift("提交", "确定", "保存", "暂存", "结账", "审核", "审批", "作废", "回退", "退回", "驳回", 
"退单", "撤消", "导入", "受理", "办理", "处理", "查询", "入库", "入账", "出库", "出账"); 
for (i = 0; i < my_array.length; i++) { 
if(new RegExp(my_array[i],"ig").test(btnvalue)) { 
showProcess = true; 
break; 
} 
} 
//alert(showProcess); 
//不显示进度条 
if(!showProcess) { 
return; 
} 
// 
createProcessBgDiv(); 
} 

function nocontextmenu() 
{ 
event.cancelBubble = true 
event.returnValue = false; 
return false; 
} 
function norightclick() 
{ 
if (event.button == 2 || event.button == 3) 
{ 
event.cancelBubble = true 
event.returnValue = false; 
return false; 
} 
} 
//页面蒙版 
function createProcessBgDiv() 
{ 
var h=document.body.scrollHeight; 
var w=document.body.scrollWidth; 
var div=document.createElement("<div id='divProcessBg' style='position:absolute;visibility:visible;background:gray;filter:alpha(opacity=30);z-index:1000;left:0;top:0;width:"+w+"px;height:"+h+"px;'></div>"); 
//div.appendChild(document.createTextNode("xxxxxxxxxxxxxxxxxxxx")); 
div.appendChild(document.createElement("<iframe src='javascript:false' style='position:absolute; visibility:inherit; top:0px; left:0px; width:"+w+"px;height:"+h+"px; z-index:-1; filter=\"progid:DXImageTransform.Microsoft.Alpha(style=0,opacity=0)\";'></iframe>")); 
document.body.appendChild(div); 
document.body.appendChild(document.createElement("<div style='position:absolute;z-index:1002;left:0;top:0;width:"+w+"px;height:"+h+"px;background:url(/upload/2010-3/20100310161010599.gif) no-repeat center center;'></div>")); 
//屏蔽鼠标右键 
document.oncontextmenu = nocontextmenu; // for IE5+ 
document.onmousedown = norightclick; // for all others 
} 
/*function delProcessBgDiv() 
{ 
document.body.removeChild(document.getElementById("divProcessBg")); 
document.onmousedown = null; 
} */