重點看標紅的
<input type="text" style="display:none" disabled autocomplete = "off" value=" ">
<input name="用戶名" type="text" id="username" autocomplete="off"/><i>用戶名</i>
<input type="password" style="display:none" disabled autocomplete = "off" value=" ">
<input name="密碼" type="text" οnfοcus="this.type='password'" id="userpwd" autocomplete="off" /><i>密碼</i>
或者 <input name="密碼" type="password" readonly οnfοcus="this.removeAttribute('readonly');" id="userpwd" autocomplete="off" /><i>密碼</i>
在文檔加載完成後將用戶名、密碼輸入內框設置爲容空
window.load=function(){document.getElementById('密碼域ID').value='';};
或者
document.getElementById('username').value='';
document.getElementById('userpwd').value='';