​x
 
<!DOCTYPE html>
<html>
<body>
​
<p>请在文本字段中写一些东西，然后按重置按钮。</p>
​
<form onreset="myFunction()">
  <input type="text" id="myInput">
  <input type="reset">
</form>
​
<script>
function myFunction() {
  var x = document.getElementById("myInput");
  alert("Before reset, the text was: " + x.value);
}
</script>
​
</body>
</html>
​