<html>
<body>
E-mail: <input type="email" id="myEmail" name="usremail">
<p>点击按钮显示或者修改 email 字段 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("email 名称为: " + x);
}
function change() {
var x = document.getElementById("myEmail").name = "newEmailName";
alert ("名称修改为: " + x);
}
</script>
</body>
</html>