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<!DOCTYPE html> <html> <body> <form id="frm1" action="/action_page.php" method="post"> First name: <input type="text" name="fname" value="Donald"><br> Last name: <input type="text" name="lname" value="Duck"><br><br> <input type="submit" value="提交"> </form> <p>点击“试一试”，显示窗体的enctype属性的值：</p> <button onclick="myFunction()">试一试</button> <p id="demo"></p> <script> function myFunction() { var x = document.getElementById("frm1").enctype; document.getElementById("demo").innerHTML = x; } </script> </body> </html>