<!DOCTYPE html>
<html>
<body>
<form id="frm1" action="/action_page.php">
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>单击“试一试”以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("frm1"); var text = "";
var i;
for (i = 0; i < x.length ;i++) { text += x.elements[i].value + "<br>";
}
document.getElementById("demo").innerHTML = text;}
</script>
</body>
</html>