javascript记住用户名和登录密码（两种方式）

2024-05-06 16:24:21

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这篇文章主要通过两种方式介绍javascript记住用户名和登录密码，有需要的小朋友可以来参考下

下面主要通过代码给大家展示下javascript记住用户名和登录密码，具体代码内容请看下文。

第一种方式：

CONTENT login.html welcome.html cookie.js common.js

login.html

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">

<head>

<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />

<title>login</title>

<script type="text/javascript" src="cookie.js"></script>

<script type="text/javascript" src="common.js"></script>

</head>

<body>

<form action="">

<p>

<span>UserName:</span>

<input id="userName" type="text" value=""/></p>

<p>

<span>Password:</span>

<input id="password" type="password" value=""/></p>

<p>

<span style="font-size:12px; color:blue;">记住密码</span>

<input id="saveCookie" type="checkbox" value="" /></p>

<p>

<input id="submit" type="button" value="GO" />

</p>

</form>

</body>

</html>

welcome.html

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">

<head>

<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />

<title>welcome</title>

</head>

<body>

<h1>Welcome!</h1>

<a href="login.html">点击返回登陆框</a>

</body>

</html>

cookie.js

//新建cookie。

//hours为空字符串时,cookie的生存期至浏览器会话结束。hours为数字0时,建立的是一个失效的cookie,这个cookie会覆盖已经建立过的同名、同path的cookie（如果这个cookie存在）。

function setCookie(name,value,hours,path){

var name = escape(name);

var value = escape(value);

var expires = new Date();

expires.setTime(expires.getTime() + hours*3600000);

path = path == "" ? "" : ";path=" + path;

_expires = (typeof hours) == "string" ? "" : ";expires=" + expires.toUTCString();

document.cookie = name + "=" + value + _expires + path;

}

//获取cookie值

function getCookieValue(name){

var name = escape(name);

//读cookie属性，这将返回文档的所有cookie

var allcookies = document.cookie;

//查找名为name的cookie的开始位置

name += "=";

var pos = allcookies.indexOf(name);

//如果找到了具有该名字的cookie，那么提取并使用它的值

if (pos != -1){ //如果pos值为-1则说明搜索"version="失败

var start = pos + name.length; //cookie值开始的位置

var end = allcookies.indexOf(";",start); //从cookie值开始的位置起搜索第一个";"的位置,即cookie值结尾的位置

if (end == -1) end = allcookies.length; //如果end值为-1说明cookie列表里只有一个cookie

var value = allcookies.substring(start,end); //提取cookie的值

return (value); //对它解码

}

else return ""; //搜索失败，返回空字符串

}

//删除cookie

function deleteCookie(name,path){

var name = escape(name);

var expires = new Date(0);

path = path == "" ? "" : ";path=" + path;

document.cookie = name + "="+ ";expires=" + expires.toUTCString() + path;

}

common.js

function $(objStr){return document.getElementByIdx_x_x(objStr);}

window.onload = function(){

//分析cookie值，显示上次的登陆信息

var userNameValue = getCookieValue("userName");

$("userName").value = userNameValue;

var passwordValue = getCookieValue("password");

$("password").value = passwordValue;

//写入点击事件

$("submit").onclick = function()

{

var userNameValue = $("userName").value;

var passwordValue = $("password").value;

//服务器验证（模拟）

var isAdmin = userNameValue == "admin" && passwordValue =="123456";

var isUserA = userNameValue == "userA" && passwordValue =="userA";

var isMatched = isAdmin || isUserA;

if(isMatched){

if( $("saveCookie").checked){

setCookie("userName",$("userName").value,24,"/");

setCookie("password",$("password").value,24,"/");

}

alert("登陆成功,欢迎你," + userNameValue + "!");

self.location.replace("welcome.html");

}

else alert("用户名或密码错误，请重新输入！");

}

}

第二种方式：

<script type="text/javascript">

window.onload=function onLoginLoaded() {

if(isPostBack == "False") {

GetLastUser();

}

}

function GetLastUser() {

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

var usr = GetCookie(id);

if (usr != null) {

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

}

else {

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

}

GetPwdAndChk();

}

//点击登录时触发客户端事件

function SetPwdAndChk() {

//取用户名

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

alert(usr);

//将最后一个用户信息写入到Cookie

SetLastUser(usr);

//如果记住密码选项被选中

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

//取密码值

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

alert(pwd);

var expdate = new Date();

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

//将用户名和密码写入到Cookie

SetCookie(usr, pwd, expdate);

}

else {

//如果没有选中记住密码,则立即过期

ResetCookie();

}

}

function SetLastUser(usr) {

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

var expdate = new Date();

//当前时间加上两周的时间

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

SetCookie(id, usr, expdate);

}

//用户名失去焦点时调用该方法

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));

}

//写入到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>

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

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

密码：

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

记住密码

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

</div>

</form>

</body>