代码为设置Cookie和获取Cookie方法的例子 
复制代码代码如下:

function SetUserCookie() { 
//取用户名 
var usr = document.getElementById('user').value; 
var expdate = new Date(); 
//当前时间加上两周的时间 
expdate.setTime(expdate.getTime() + 14 * (24 * 60 * 60 * 1000)); 
//将最后一个用户信息写入到Cookie 
SetCookie("49BA-C005-7D-OADOC-5B-USER",usr,expdate); 

function GetUserCookie() { 
var id = "49BA-C005-7D-OADOC-5B-USER";//GUID标识符 
var usr = GetCookie(id); 
if (usr != null) { 
document.getElementById('userid').value = usr; 


//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" : ""); 

//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; 

function getCookieVal(offset) { 
var endstr = document.cookie.indexOf(";", offset); 
if (endstr == -1) endstr = document.cookie.length; 
return unescape(document.cookie.substring(offset, endstr));