js实用方法记录-简单cookie操作

/**
 * 设置cookie
 * @param {string} name cookie名称
 * @param {string} value cookie值
 * @param {number}[expiredays=null] 过期时间 默认session级别 <=0移除cookie
 * @param {bool}[saveRoot=true] 保存的域 默认根域
 */
function setCookie(name, value, expiredays=null,saveRoot=false) {
    var exdate = new Date();
    exdate.setDate(exdate.getDate() + expiredays)
    var cookie = name + "=" + value + ';path=/' + ((expiredays == null) ? "" : ";expires=" + exdate.toGMTString());
    if(saveRoot){
    //适用于一级，二级，本地域名
      var domain =((location.host.match(/\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}/g) || location.hostname=='localhost')? location.hostname:('.' + (location.host.split('.')[2]!=undefined?(location.host.split('.')[1]+'.'+location.host.split('.')[2]):location.host)));
      cookie+=(';domain='+domain);
    }
    document.cookie = cookie;
}

/**
 * 获取cookie
 * @param {string} name cookie名称
 */
function getCookie(name) {
    var arr, reg = new RegExp("(^| )" + name + "=([^;]*)(;|$)");
    if (arr = document.cookie.match(reg))
      return unescape(arr[2]);
    else
      return null;
}