window.open启动URL后返回null

我想限制用户打开我的应用程序的多个IFrame窗口。我的代码如下，window.open启动URL后返回null

<html> 
<head> 
<title>Test for Window Already Open</title> 
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"> 
<script> 

var gmyWin=null; 

function myOpenWindow(winURL,winName,winFeatures,winObj) 
{ 
    var theWin; 
    theWin = window.open(winURL,winName,winFeatures); 
    // here theWin variable is null 
    return theWin; 
} 
</script> 
</head> 

<body> 
<h1>Click this link to open the new window:</h1> 
<p><a href='javascript:;' onClick='javascript:gmyWin=myOpenWindow("http://example:7001/tester/helloworld.jsp","myWin","height=630,width=1100",gmyWin);return false'>open new window</a> </p> 
</body>

我尝试访问theWin变量，但它总是返回null。我想检查窗口是否打开，但我无法检查，打开URL后window.open返回null。请帮我解决问题。

来源

2014-06-17 user3749196

你为什么不使用window.location的？ –

只需设置一个标志。

function myOpenWindow(winURL,winName,winFeatures,winObj) 
{ 
    var windowIsOpen = false; 
    window.open(winURL,winName,winFeatures); 
    windowIsOpen = true; 

    return windowIsOpen; 
}

来源

2014-06-17 15:59:23 Sawny

以及采取的变量的值，你可以返回一个布尔变量

<html> 
<head> 
<title>Test for Window Already Open</title> 
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"> 
<script> 
function myOpenWindow(winURL,winName,winFeatures,winObj) 
{ 
    var windowOpen = false; 
    window.open(winURL,winName,winFeatures); 
    windowOpen = true; 

    return windowOpen; 
} 
</script> 
</head> 

<body> 
<h1>Click this link to open the new window:</h1> 
<p><a href='javascript:;' onClick='javascript:gmyWin= return myOpenWindow("http://example:7001/tester/helloworld.jsp","myWin","height=630,width=1100",gmyWin);return false'>open new window</a> </p> 
</body>

必须添加一个return语句：l，布尔值

来源

2014-06-17 16:05:31 MickyScion

window.open启动URL后返回null

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