实例代码“Ctrl+/”提示“F11/ESC”全屏 返回 格式化 恢复 运行
AخA
 
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<!DOCTYPE html>
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<html>
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<head>
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<script>
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function check()
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{
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if (window.top!=window.self)
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  {
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  document.write("<p>This window is not the topmost window! Am I in a frame?</p>")
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  }
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else
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  {
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  document.write("<p>This window is the topmost window!</p>")
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  }
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}
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</script>
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</head>
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<body>
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<input type="button" onclick="check()" value="Check window">
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</body>
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</html>