W3School TIY Editor
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<!DOCTYPE html> <html> <body> <form id="myForm" action="/demo/htmldom/action_page.php"> 名字：<input type="text" name="fname" value="Bill"><br> 姓氏：<input type="text" name="lname" value="Gates"><br> <input type="submit" value="提交"> </form> <p>请单击“试一试”按钮，显示表单中每个元素的值。</p> <button onclick="myFunction()">试一试</button> <p id="demo"></p> <script> function myFunction() { var x = document.getElementById("myForm"); var txt = ""; var i; for (i = 0; i < x.length; i++) { txt = txt + x.elements[i].value + "<br>"; } document.getElementById("demo").innerHTML = txt; } </script> </body> </html>