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<!DOCTYPE html> <html> <body> 该文件在IE中显示<span id="demo"></span> mode <p><b>注意：</b> documentMode 属性仅在 IE8+ 的 Internet Explorer 中受支持</p> <p><b>注意：</b> 如果没有指定 !DOCTYPE，IE8 将以 IE5 模式呈现页面！</p> <script> var x = document.documentMode; document.getElementById("demo").innerHTML = x; </script> </body> </html>