cookie示例：登陆页面中的记住密码功能
CONTENTlogin.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 unescape(value); //对它解码 } else return ""; //搜索失败，返回空字符串}//删除cookiefunction 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，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！"); }}
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