JavaScript使用cookie實現記住賬號密碼功能

2024-05-06 16:18:51

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這篇文章主要介紹了JavaScript使用cookie實現記住賬號密碼功能,本文直接給出完整測試代碼,需要的朋友可以參考下

很多登錄功能上都有個“記住密碼”的功能，其實無非就是對cookie的讀取。

下面展示這個功能的代碼，原作者已無法考究。。。。

測試方法：直接輸入賬號密碼，提交后，刷新頁面，再輸入同樣的賬號，就可以顯示

<!DOCTYPE HTML>

<head>

<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />

<title>js COOKIE 記住帳號或密碼</title>

<script type="text/javascript">

window.onload=function onLoginLoaded() {

if (isPostBack == "False") {

GetLastUser();

}

}

function GetLastUser() {

var id = "49BAC005-7D5B-4231-8CEA-16939BEACD67";//GUID標識符

var usr = GetCookie(id);

if (usr != null) {

document.getElementById('txtUserName').value = usr;

} else {

document.getElementById('txtUserName').value = "001";

}

GetPwdAndChk();

}

//點擊登錄時觸發客戶端事件

function SetPwdAndChk() {

//取用戶名

var usr = document.getElementById('txtUserName').value;

alert(usr);

//將最后一個用戶信息寫入到Cookie

SetLastUser(usr);

//如果記住密碼選項被選中

if (document.getElementById('chkRememberPwd').checked == true) {

//取密碼值

var pwd = document.getElementById('txtPassword').value;

alert(pwd);

var expdate = new Date();

expdate.setTime(expdate.getTime() + 14 * (24 * 60 * 60 * 1000));

//將用戶名和密碼寫入到Cookie

SetCookie(usr, pwd, expdate);

} else {

//如果沒有選中記住密碼,則立即過期

ResetCookie();

}

}

function SetLastUser(usr) {

var id = "49BAC005-7D5B-4231-8CEA-16939BEACD67";

var expdate = new Date();

//當前時間加上兩周的時間

expdate.setTime(expdate.getTime() + 14 * (24 * 60 * 60 * 1000));

SetCookie(id, usr, expdate);

}

//用戶名失去焦點時調用該方法

function GetPwdAndChk() {

var usr = document.getElementById('txtUserName').value;

var pwd = GetCookie(usr);

if (pwd != null) {

document.getElementById('chkRememberPwd').checked = true;

document.getElementById('txtPassword').value = pwd;

} else {

document.getElementById('chkRememberPwd').checked = false;

document.getElementById('txtPassword').value = "";

}

}

//取Cookie的值

function GetCookie(name) {

var arg = name + "=";

var alen = arg.length;

var clen = document.cookie.length;

var i = 0;

while (i < clen) {

var j = i + alen;

//alert(j);

if (document.cookie.substring(i, j) == arg) return getCookieVal(j);

i = document.cookie.indexOf(" ", i) + 1;

if (i == 0) break;

}

return null;

}

var isPostBack = "<%= IsPostBack %>";

function getCookieVal(offset) {

var endstr = document.cookie.indexOf(";", offset);

if (endstr == -1) endstr = document.cookie.length;

return unescape(document.cookie.substring(offset, endstr));

}

//寫入到Cookie

function SetCookie(name, value, expires) {

var argv = SetCookie.arguments;

//本例中length = 3

var argc = SetCookie.arguments.length;

var expires = (argc > 2) ? argv[2] : null;

var path = (argc > 3) ? argv[3] : null;

var domain = (argc > 4) ? argv[4] : null;

var secure = (argc > 5) ? argv[5] : false;

document.cookie = name + "=" + escape(value) + ((expires == null) ? "" : ("; expires=" + expires.toGMTString())) + ((path == null) ? "" : ("; path=" + path)) + ((domain == null) ? "" : ("; domain=" + domain)) + ((secure == true) ? "; secure" : "");

}

function ResetCookie() {

var usr = document.getElementById('txtUserName').value;

var expdate = new Date();

SetCookie(usr, null, expdate);

}

</script>

</head>

<body>

<form id="form1">

<div> 用戶名:

<input type="text" ID="txtUserName" onblur="GetPwdAndChk()">

<input type="password" ID="txtPassword">

密碼：

<input type="checkbox" ID="chkRememberPwd" />

記住密碼

<input type="button" OnClick="SetPwdAndChk()" value="進入"/>

</div>

</form>

</body>

</html>