js realizes editing by clicking the button

<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(&#39;ps&#39;);
       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(&#39;ps&#39;);
       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 style="font: 16px &#39;宋体&#39;;">姓名: <input type="text" name="name" value="张三" /></p>
<p style="font: 16px &#39;宋体&#39;;">账号: <input type="text" name="handset" value="13888888888" /></p>
<p style="font: 16px &#39;宋体&#39;;">密码: <span id="pass" style="border: 1px solid gray; width: 200px;">888888</span> <textarea id="ei" style="display: none;" name="newpass">888888</textarea> <input id="btt" onclick="edit();" type="button" name="btt" value="编 辑" /> <input id="of" style="display: none;" onclick="off();" type="button" name="of" value="取 消" /></p>
</form>