前端面试题之一JAVASCRIPT（算法类）

一、JS操作获取和设置cookie

//创建cookie
function setcookie(name, value, expires, path, domain, secure) {
    var cookietext = encodeuricomponent(name) + '=' + encodeuricomponent(value);
    if (expires instanceof date) {
        cookietext += '; expires=' + expires;
    }
    if (path) {
        cookietext += '; expires=' + expires;
    }
    if (domain) {
        cookietext += '; domain=' + domain;
    }
    if (secure) {
        cookietext += '; secure';
    }
    document.cookie = cookietext;
}
//获取cookie
function getcookie(name) {
    var cookiename = encodeuricomponent(name) + '=';
    var cookiestart = document.cookie.indexof(cookiename);
    var cookievalue = null;
    if (cookiestart > -1) {
        var cookieend = document.cookie.indexof(';', cookiestart);
        if (cookieend == -1) {
            cookieend = document.cookie.length;
        }
        cookievalue = decodeuricomponent(document.cookie.substring(cookiestart + cookiename.length, cookieend));
    }
    return cookievalue;
}
//删除cookie
function unsetcookie(name) {
    document.cookie = name + "= ; expires=" + new date(0);
}