项目开发讲究通配，一个配置到处使用，而且还各有各的环境来确定各自的配置文件信息，看如下代码：

require('../lib/util');// 此配置文件适合多人合作设置各自不同环境的配置信息var env      = 'dev'; // dev or productvar devloper = 'antianlu'; // 开发者：defaults,your name，默认是系统默认的配置，开发者名字按照各自环境配置自己的配置文件信息,适合多人合作情况var http     = 'http://'; //http:// or https://var settings = {    base: {        appName: "Ablog",        version: "0.0.1",        env: env,        cookie: {            secret: "0o80ilpoablog",            id: 'ablog'        },        session: {            secret: "0o80ilpoablog",            id: 'ablog'        },        desc:'基本配置'    },    dev: {        defaults: {            hostname: {                host: "127.0.0.1",                port: 3000            },            mongodb: {                host: "localhost",                port: "27017",                dbname: "blog",                username: "",                password: ""            },            mysql: {                host: '127.0.0.1://mysql',                username: 'mysql',                password: 'test'            }        },        antianlu: {            hostname: {                host: "127.0.0.1",                port: 3000            },            mongodb: {                host: "localhost",                port: "27017",                dbname: "blog",                username: "",                password: ""            },            mysql: {                host: '127.0.0.1://mysql',                username: 'mysql',                password: 'test'            }        },        desc:'开发环境配置'    },    product: {        hostname: {            host: "https://www.ablog.com",            port: 80        },        mongodb: {            host: "",            port: "",            name: "ablog",            username: "uname",            password: "pwd"        },        mysql: {            host: '192.168.1.88://mysql',            username: 'ablog',            password: 'test'        },        desc: '网站发布地址配置'    }}var c = env === 'dev' ? settings[env][devloper] : settings[env],    mongo = c.mongodb,    hostname = c.hostname;c.mongodb.url = "mongodb://" + mongo.host + ":" + mongo.port + "/" + mongo.dbname;c.hostname.url = http + hostname.host + ":" + hostname.port;module.exports = settings.base.extend(c);

 ../lib/util文件内容，相当于jquery的extend,深度拷贝

/** * Created by Administrator on 14-5-15. */Object.prototype.extend = function () {    var target = arguments[0] || {}, i = 1, length = arguments.length, deep = false, options, name, src, copy;    if (typeof target === "boolean") {        deep = target;        target = arguments[1] || {};        i = 2;    }    if (typeof target !== "object" && typeof target !== "function") {        target = {};    }    if (length === i) {        target = this;        --i;    }    for (; i < length; i++) {        if ((options = arguments[i]) != null) {            for (name in options) {                src = target[name];                copy = options[name];                if (target === copy) {                    continue;                }                if (deep && copy && (typeof copy === 'object' || typeof copy === 'array') && !copy.nodeType) {                    var clone = src && (typeof src === 'object' || typeof src === 'array') ? src : typeof copy === 'array' ? [] : {};                    target[name] = this.extend(deep, clone, copy);                } else if (copy !== undefined) {                    target[name] = copy;                }            }        }    }    return target;}module.exports ={    merge: function (o1, o2, override) {        for (var p in o2) {            if (o2.hasOwnProperty(p) && (!o1.hasOwnProperty(p) || override)) {                o1[p] = o2[p];            }        }    }}