解析Cookie

var parseCookie = function(cookie){
    var cookies = {};
    if(!cookie){
        return cookies;
    }
    var list = cookie.split(';');
    for (var i=0;i<list.length;i++){
        var pair = list[i].split('=');
        cookies[pair[0].trim()] = pair[1];
    }
    return cookies;
};