<!DOCTYPE HTML>
<html lang="en-US">
<head>
  <meta charset="UTF-8">
  <title>cookie的應用——記住用戶名</title>
</head>
<body>
  <form action="#" id="myform">
    <label for="username">用戶名：</label><input type="text" name="username" id="username" />
    <label for="userpass">密碼：</label><input type="password" name="userpass" id="userpass" />
    <input type="submit" value="登錄" />
    <a href="javascript:;">清除記錄</a>
  </form>
</body>
</html>
<script type="text/javascript" src="cookie.js"></script>
<script type="text/javascript">
window.onload = function(){
  var oForm = document.getElementById('myform');
  var oTxt1 = document.getElementById('username');
  var oTxt2 = document.getElementById('userpass');
  var oClear = document.getElementsByTagName('a')[0];
  oTxt1.value = getCookie('username');
  oTxt2.value = getCookie('userpass');
  oForm.onsubmit = function(){
    setCookie('username',oTxt1.value,30);
    setCookie('userpass',oTxt2.value,30);
  }
  oClear.onclick = function(){
    removeCookie('username');
    removeCookie('userpass');
    oTxt1.value = '';
    oTxt2.value = '';
  }
}
</script>

PS：這里再把前文中的那段cookie.js貼出來方便大家查看：

function setCookie(name,value,hours){
 var d = new Date();
 d.setTime(d.getTime() + hours * 3600 * 1000);
 document.cookie = name + '=' + value + '; expires=' + d.toGMTString();
}
function getCookie(name){
 var arr = document.cookie.split('; ');
 for(var i = 0; i < arr.length; i++){
  var temp = arr[i].split('=');
  if(temp[0] == name){
   return temp[1];
  }
 }
 return '';
}
function removeCookie(name){
 var d = new Date();
 d.setTime(d.getTime() - 10000);
 document.cookie = name + '=1; expires=' + d.toGMTString();
}

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