[html][javascript] Cookie

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);