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<!DOCTYPE html> <html> <body> <input value="OK"> <p>单击下面的按钮将输入字段更改为输入按钮。</p> <button onclick="myFunction()">试一试</button> <p>Internet Explorer 8 及更早版本不支持 setAttribute 方法。</p> <script> function myFunction() { document.getElementsByTagName("INPUT")[0].setAttribute("type", "button"); } </script> </body> </html>