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<!DOCTYPE html> <html> <body> <p>单击该按钮可显示文档的基本 URI。</p> <button onclick="myFunction()">试一试</button> <p><strong>注意：</strong> Internet Explorer 不支持 baseURI 属性。</p> <p id="demo"></p> <script> function myFunction() { var x = document.baseURI; document.getElementById("demo").innerHTML = x; } </script> </body> </html>