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源代码：
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<!DOCTYPE html> <html> <head> <script> var myWindow; function openWin() { myWindow=window.open("","","width=400,height=200"); } function closeWin() { if (myWindow) { myWindow.close(); } } function checkWin() { if (!myWindow) { document.getElementById("msg").innerHTML="'myWindow' has never been opened!"; } else { if (myWindow.closed) { document.getElementById("msg").innerHTML="'myWindow' has been closed!"; } else { document.getElementById("msg").innerHTML="'myWindow' has not been closed!"; } } } </script> </head> <body> <input type="button" value="Open 'myWindow'" onclick="openWin()" /> <input type="button" value="Close 'myWindow'" onclick="closeWin()" /> <br><br> <input type="button" value="Has 'myWindow' been closed?" onclick="checkWin()" /> <br><br> <div id="msg"></div> </body> </html>
运行结果
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