前端面试题之一JAVASCRIPT（算法类）

一、JS操作获取和设置cookie

//创建cookiefunction 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cookiefunction 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cookiefunction unsetcookie(name) {    document.cookie = name + "= ; expires=" + new date(0);}