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JS 参考手册
Form enctype 属性
tryjsref_form_enctype
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<!DOCTYPE html> <html> <body> <form id="myForm" action="/action_page2.php" method="post"> First name: <input type="text" name="fname" value="Donald"><br> Last name: <input type="text" name="lname" value="Duck"><br> <input type="submit" value="Submit"> </form> <p>Click the "Try it" button to return the value of the enctype attribute in the form element.</p> <button onclick="myFunction()">Try it</button> <p id="demo"></p> <script> function myFunction() { var x = document.getElementById("myForm").enctype; document.getElementById("demo").innerHTML = x; } </script> </body> </html>