共計以下4個文件 點擊“下載”
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;">記住密碼</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">點擊返回登陸框</a>
</body>
</html>
cookie.js
//新建cookie。
//hours為空字符串時,cookie的生存期至瀏覽器會話結束。hours為數字0時,建立的是一個失效的cookie,這個cookie會覆蓋已經建立過的同名、同path的cookie（如果這個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;
}
//獲取cookie值
function getCookieValue(name){
var name = escape(name);
//讀cookie屬性，這將返回文檔的所有cookie
var allcookies = document.cookie;
//查找名為name的cookie的開始位置
name += "=";
var pos = allcookies.indexOf(name);
//如果找到了具有該名字的cookie，那么提取并使用它的值
if (pos != -1){ //如果pos值為-1則說明搜索"version="失敗
var start = pos + name.length; //cookie值開始的位置
var end = allcookies.indexOf(";",start); //從cookie值開始的位置起搜索第一個";"的位置,即cookie值結尾的位置
if (end == -1) end = allcookies.length; //如果end值為-1說明cookie列表里只有一個cookie
var value = allcookies.substring(start,end); //提取cookie的值
return (value); //對它解碼
}
else return ""; //搜索失敗，返回空字符串
}
//刪除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.getElementById(objStr);}
window.onload = function(){
//分析cookie值，顯示上次的登陸信息
var userNameValue = getCookieValue("userName");
$("userName").value = userNameValue;
var passwordValue = getCookieValue("password");
$("password").value = passwordValue;
//寫入點擊事件
$("submit").onclick = function()
{
var userNameValue = $("userName").value;
var passwordValue = $("password").value;
//服務器驗證（模擬）
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("登陸成功,歡迎你," + userNameValue + "!");
self.location.replace("welcome.html");
}
else alert("用戶名或密碼錯誤，請重新輸入！");
}
}