​x
 
<!DOCTYPE html>
<html>
<body>
​
<form>
密码：<input type="password" id="myPsw" name="pw">
</form>
​
<p>单击按钮以显示和/或更改密码字段的 name 属性的值。</p>
​
<button onclick="display()">显示名称</button>
<button onclick="change()">修改名称</button>
​
<script>
function display() {
  var x = document.getElementById("myPsw").name;
  alert("密码字段的名称是：" + x);
}
​
function change() {
  var x = document.getElementById("myPsw").name = "newPasswordName";
  alert ("名称已更改为：" + x);
}
</script>
​
</body>
</html>
​