JS实现点击按钮可实现编辑功能

<script type="text/javascript">
//修改密码
//抓取到的数据
function edit() {
document.getElementById("ps").style.display = "none";
document.getElementById("pw").style.display = "";
document.getElementById("of").style.display = "";
var butt = document.getElementById("btt");
butt.value = "修 改";
butt.onclick = function () {
save();//第二次单击的时候执行这个函数
};
}
//取消健
function off() {
var pass = document.getElementById('ps');
var pws = document.getElementById("pw");
var butt = document.getElementById("btt");
document.getElementById("of").style.display = "none",
butt.value = "编 辑";
pws.style.display = "none";
pass.innerHTML = pws.value;
pass.style.display = "";
butt.onclick = function () {
edit();//还原第一次单击的时候执行的函数
};
}
//编辑之后的状态
function save() {
var pass = document.getElementById('ps');
var pws = document.getElementById("pw");
var butt = document.getElementById("btt");
butt.setAttribute("type","submit");
butt.value = "编 辑";
pws.style.display = "none";
pass.innerHTML = pws.value;
pass.style.display = "";
butt.onclick = function () {
edit();//还原第一次单击的时候执行的函数
};
}
</script>
</p>
<form action="oneself.php" method="post">
<p >姓名: <input type="text" name="name" value="张三" /></p>
<p >账号: <input type="text" name="handset" value="13888888888" /></p>
<p >密码: <span id="pass" >888888</span> <textarea id="ei"  name="newpass">888888</textarea> <input id="btt" onclick="edit();" type="button" name="btt" value="编 辑" /> <input id="of"  onclick="off();" type="button" name="of" value="取 消" /></p>
</form>