​x
 
<!DOCTYPE html>
<html>
<body>
​
<form id="frm1" action="/demo/demo_form.asp">
  名：<input type="text" name="fname" value="Bill"><br>
  姓：<input type="text" name="lname" value="Gates"><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>
​