重写alert函数
以下代码来自网上
步骤一：在"Common/js/"下创建js文件SysMsgBox.js
// JScript 文件var alternateFrame=null;//生成的iframevar alternateWin=null;window.alert=showAlert;window.confirm=showConfirm;
/**
* 人机交互窗口，覆盖自带的
*/function alternateWindow(){
this.win=null;//生成对话框的窗口对象this.pBody=null;//生成的body容器对象this.pBg=null;this.type="alert";//默认的种类是alertthis.FocusWhere="OK";//焦点在哪个按钮上}/** * 模仿的alert窗口 */function showAlert(info){alternateWin=new alternateWindow();var pBody = alternateWin.init();alternateWin.initAlertBody(pBody,info);alternateWin.type="alert";} /** * 模仿的alert窗口 */function showConfirm(info,ok_func,notok_func,ok_str,not_okstr){alternateWin=new alternateWindow();var pBody = alternateWin.init();alternateWin.initConfirmBody(pBody,info,ok_func,notok_func,ok_str,not_okstr);alternateWin.type="confirm";}/** * 作用：初始基本信息 */alternateWindow.prototype.init=function() {
if(alternateFrame==null){
alternateFrame=document.createElement("<iframe allowTransparency='true' id='popframe' frameborder=0 marginheight=0 src='about:blank' marginwidth=0 hspace=0 vspace=0 scrolling=no></iframe>")alternateFrame.style.position="absolute";document.body.appendChild(alternateFrame);}else{alternateFrame.style.visibility="visible";
}alternateFrame.style.width=screen.availWidth;alternateFrame.style.height=screen.availHeight;alternateFrame.style.left=document.body.scrollLeft;alternateFrame.style.top=document.body.scrollTop;alternateFrame.name=alternateFrame.uniqueID;this.win=window.frames[alternateFrame.name];this.win.document.write("<body leftmargin=0 topmargin=0 oncontextmenu='self.event.returnValue=false'><div id=popbg></div><div id=popbody></div><div></div></body>");this.win.document.body.style.backgroundColor="transparent";document.body.style.overflow="hidden";this.pBody=this.win.document.body.children[1];this.pBg=this.win.document.body.children[0];this.hideAllSelect();this.initBg();return this.pBody;} /*** 作用：初始化背景层 */alternateWindow.prototype.initBg=function(){with(this.pBg.style){position="absolute";left="0";top="0";width="100%";height="100%";visibility="hidden";backgroundColor="#333333";filter="blendTrans(duration=1) alpha(opacity=30)";}this.pBg.filters.blendTrans.apply();this.pBg.style.visibility="visible";this.pBg.filters.blendTrans.play();}/** * 作用：初始化显示层 */alternateWindow.prototype.initAlertBody=function(obj,info){with(obj.style){position="absolute";width="400";height="150";backgroundColor="#ffffff";}obj.style.left=window.document.body.clientWidth/2-200;obj.style.top=window.document.body.clientHeight/3;var str;str ="<table border=0 cellpadding=0 cellspacing=1 bgcolor=#000000 width=100% height=100%><tr height=30>";str+="<td align=left style='color:#000000;font-size:14px;font-weight:bold' bgcolor=#9999ff>[提示]</td></tr>";str+="<tr><td align=center bgcolor=#efefff style='font-size:12px;color:#000000;vertical-align: middle;'>";str+=info+"</td></tr><tr height=30 bgcolor=#efefef><td align=center>" + "<input type='button' value='确定' id='OK'" + " onkeydown='parent.alternateWin.onKeyDown(event,this)'"+ " onclick='parent.alternateWin.closeWin()' style='border:solid 1px #666666;background:#cccccc'>" + "</td></tr></table>";obj.innerHTML=str;this.win.document.body.all.OK.focus();this.FocusWhere="OK";}alternateWindow.prototype.onKeyDown=function(event,obj){ switch(event.keyCode){ case 9: event.keyCode=-1; if(this.type=="confirm"){ if(this.FocusWhere=="OK"){ this.win.document.body.all.NO.focus(); this.FocusWhere="NO"; }else{ this.win.document.body.all.OK.focus(); this.FocusWhere="OK"; } } break; case 13:obj.click();;break; case 27:this.closeWin();break; } }/** * 作用：初始化显示层 conFirm提示层 */alternateWindow.prototype.initConfirmBody=function(obj,info,ok_func,notok_func,ok_str,notok_str){with(obj.style){position="absolute";width="400";height="150";backgroundColor="#ffffff";}if(ok_str==null){ok_str="确定";}if(notok_str==null){notok_str="取消"}obj.style.left=window.document.body.clientWidth/2-200;obj.style.top=window.document.body.clientHeight/3;var str;str="<table border=0 cellpadding=0 cellspacing=1 bgcolor=#000000 width=100% height=100%><tr height=30>";str+="<td align=left style='color:#000000;font-size:14px;font-weight:bold' bgcolor=#9999ff>[询问]</td></tr>";str+="<tr><td align=center bgcolor=#efefff style='font-size:12px;color:#000000;vertical-align: middle;'>";str+=info+"</td></tr><tr height=30 bgcolor=#efefef><td align=center>" +"<input type='button' id='OK'" +" onkeydown='parent.alternateWin.onKeyDown(event,this)'"+" onclick='parent.alternateWin.closeWin();parent."+ok_func+"();' " +" value='"+ok_str+"' style='border:solid 1px #666666;background:#cccccc'>"+" <input type='button' value='"+notok_str+"' id='NO'"+" onkeydown='parent.alternateWin.onKeyDown(event,this)'"+" onclick='parent.alternateWin.closeWin();" +" parent."+notok_func+"();' style='border:solid 1px #666666;background:#cccccc'></td></tr></table>";obj.innerHTML=str;this.win.document.body.all.OK.focus();}/** * 作用：关闭一切 */alternateWindow.prototype.closeWin=function(){alternateFrame.style.visibility="hidden";this.showAllSelect();document.body.style.overflow="auto";}/** * 作用:隐藏所有的select */alternateWindow.prototype.hideAllSelect=function(){ var obj; obj=document.getElementsByTagName("SELECT"); var i; for(i=0;i<obj.length;i++)obj[i].style.visibility="hidden"; }/** * 显示所有的select */ alternateWindow.prototype.showAllSelect=function(){ var obj; obj=document.getElementsByTagName("SELECT"); var i; for(i=0;i<obj.length;i++)obj[i].style.visibility="visible";}<html xmlns="http://www.w3.org/1999/xhtml"><head runat="server"> <title>无标题页</title> <script language="javascript" src="http://www.cnblogs.com/Common/JS/SysMsgBox.js"></script> <script language="javascript" type="text/javascript"> function f_yes() { alert('提交成功'); } function f_no() { return ; } </script></head><body> <form id="form1" runat="server"> <div> <button onclick="confirm('确认提交？','f_yes','f_no','是','否')"> 提示</button> <button onclick="alert('hello!')"> hello!</button> </div> </form></body></html>
