更多可参考:http://www.cnblogs.com/newsouls/archive/2012/11/12/2766567.html
// 读 cookie 方法
function getCookie(name){
var arr = document.cookie.match(new RegExp("(^| )"+name+"=([^;]*)(;|$)"));
if(arr != null)
return decodeURI(arr[2]);
return null;
}// 写 cookie 方法
function setCookie(name,value,expiredays){
if(!isNaN(expiredays)){
var date = new Date();
date.setDate(date.getDate() + expiredays);
//date.setTime(date.getTime() + expiredays * 24 * 3600 * 1000);
document.cookie = name + '=' + encodeURI(value) + ';expires=' + date.toGMTString();
} else {
document.cookie = name + '=' + encodeURI(value);
}
}alert(getCookie("name"));
setCookie('name','游客');
setCookie('name','普通用户',7);