​x
 
<!DOCTYPE html>
<html>
<body>
​
电子邮件：<input type="email" id="myEmail" name="usremail">
​
<p>单击按钮可显示和/或更改电子邮件字段的 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("myEmail").name;
  alert("电子邮件字段的名称是：" + x);
}
​
function change() {
  var x = document.getElementById("myEmail").name = "newEmailName";
  alert ("名称已更改为：" + x);
}
</script>
​
</body>
</html>
​