JS实现登录页密码的显示和隐藏功能

<ul class="form-area">
 <li>
  <div class="item-content">
   <div class="item-input">
    <input type="text" name="accountName" autofocus required="required" placeholder="请输入用户名">
   </div>
  </div>
 </li>
 <li>
  <div class="item-content">
   <div class="item-input">
     <input type="password" name="password" id="password" required="required" placeholder="请输入密码">
   </div>
  </div>
 </li>
 <li>
  <span >
   <img id="showText" onclick="hideShowPsw()">
  </span>
 </li>
</ul>

<script type="text/javascript">
//获取input框内的切换图片id和input文本框的id
 var demoImg = document.getElementById("showText");
 var demoInput = document.getElementById("password");
 function hideShowPsw() {
  if (demoInput.type == "password") {
   demoInput.type = "text";
   demoImg.src ="../Images/showPasswd.png";
  } else {
   demoInput.type = "password";
   demoImg.src = "../Images/hidePasswd.png";
  }
 }
</script>