用javascript父窗口控制只弹出一个子窗口


答案：近来网上经常流传一些关于如何在父窗口控制只弹出一个子窗口 问题，我查看了一些，大部分都是只能解决部分或者很麻烦，还不算完美。比如有人是实现的这样，使用的是Cookie，以下是例子。 

主页上做了一个弹出窗口，如何使其只弹出一次，返回主页时不再弹出了。 

--------------------------------------------------------------- 


<script> 

window.open("http://www.yeboss.com.cn","yeboss","width=300,height=400") 

</script> 

--------------------------------------------------------------- 


cookie 

--------------------------------------------------------------- 




<HEAD> 


<SCRIPT LANGUAGE="JavaScript"> 


<!-- Begin 

var expDays = 1; // number of days the cookie should last 


var page = "only-popup-once.html"; 

var windowprops = "width=300,height=200,location=no,易做图=no,menubar=no,scrollbars=no,resizable=yes"; 


function GetCookie (name) { 

var arg = name + "="; 

var alen = arg.length; 

var clen = document.cookie.length; 

var i = 0; 

while (i < clen) { 

var j = i + alen; 

if (document.cookie.substring(i, j) == arg) 

return getCookieVal (j); 

i = document.cookie.indexOf(" ", i) + 1; 

if (i == 0) break; 

} 

return null; 

} 

function SetCookie (name, value) { 

var argv = SetCookie.arguments; 

var argc = SetCookie.arguments.length; 

var expires = (argc > 2) ? argv[2] : null; 

var path = (argc > 3) ? argv[3] : null; 

var domain = (argc > 4) ? argv[4] : null; 

var secure = (argc > 5) ? argv[5] : false; 

document.cookie = name + "=" + escape (value) + 

((expires == null) ? "" : ("; expires=" + expires.toGMTString())) + 

((path == null) ? "" : ("; path=" + path)) + 

((domain == null) ? "" : ("; domain=" + domain)) + 

((secure == true) ? "; secure" : ""); 

} 

function DeleteCookie (name) { 

var exp = new Date(); 

exp.setTime (exp.getTime() - 1); 

var cval = GetCookie (name); 

document.cookie = name + "=" + cval + "; expires=" + exp.toGMTString(); 

} 

var exp = new Date(); 

exp.setTime(exp.getTime() + (expDays*24*60*60*1000)); 

function amt(){ 

var count = GetCookie(’count’) 

if(count == null) { 

SetCookie(’count’,’1’) 

return 1 

} 

else { 

var newcount = parseInt(count) + 1; 

DeleteCookie(’count’) 

SetCookie(’count’,newcount,exp) 

return count 

   } 

} 

function getCookieVal(offset) { 

var endstr = document.cookie.indexOf (";", offset); 

if (endstr == -1) 

endstr = document.cookie.length; 

return unescape(document.cookie.substring(offset, endstr)); 

} 


function checkCount() { 

var count = GetCookie(’count’); 

if (count == null) { 

count=1; 

SetCookie(’count’, count, exp); 


window.open(page, "", windowprops); 


} 

else { 

count++; 

SetCookie(’count’, count, exp); 

   } 

} 

//  End --> 

</script> 




<BODY OnLoad="checkCount()"> 

这个是网上随便摘的一个例子，是不是感觉很多也很难看懂呢，下面我给大家说一种新方法，保证好看好使。


<script language="JavaScript" type="text/JavaScript">

<!--  Copyright fenggang at 2007/3/23

var w=null;

function MM_openBrWindow(theURL,winName,features) { //v2.0

  if(w!=undefined&&isOpen()){

   w.close();

  }

   w=window.open("",winName,features);

   w.location.replace(theURL);

}

function isOpen()

{

  try

  {

  w.document;

  return true;

  }

  catch(ex)

  {}


  return false;

}

//-->

</script>

这个MM_openBrWindow（）函数名是在Dreamweaver中常用的弹出窗口函数名，将这段代码放进页面里

然后再做弹出窗口就只能探出一个窗口了，以上是精髓部分，下面是完整的一个测试页的代码，试试看吧。

<%@LANGUAGE="VBSCRIPT" CODEPAGE="936"%>

<!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">

<head>

<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />

<title>无标题文档</title>

<script language="JavaScript" type="text/JavaScript">

<!--  Copyright fenggang at 2007/3/23

var w=null;

function MM_openBrWindow(theURL,winName,features) { //v2.0

  if(w!=undefined&&isOpen()){

   w.close();

  }

   w=window.open("",winName,features);

   w.location.replace(theURL);

}

function isOpen()

{

  try

  {

  w.document;

  return true;

  }

  catch(ex)

  {}


  return false;

}

//-->

</script>

</head>

<body>

<a href=></body>

</html>
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