本人也是前端爱好者，最近在用Node.js和MongoDB搭建自己的网站，本地运行很好。
按照BAE上修改链接方式后，访问网站出错，提示：

可以访问 http://siblim.duapp.com/ 查看错误如下 Error: Error connecting to database: failed to connect to [127.0.0.1:27017] at null. (/home/bae/app/node_modules/connect-mongo/node_modules/mongodb/lib/mongodb/connection/server.js:553:74) at EventEmitter.emit (events.js:106:17) at null. (/home/bae/app/node_modules/connect-mongo/node_modules/mongodb/lib/mongodb/connection/connection_pool.js:140:15) at EventEmitter.emit (events.js:98:17) at Socket. (/home/bae/app/node_modules/connect-mongo/node_modules/mongodb/lib/mongodb/connection/connection.js:512:10) at Socket.EventEmitter.emit (events.js:95:17) at net.js:441:14 at process._tickCallback (node.js:415:13)

但是本地链接代码，个人已经修改了。怎么还会链接failed to connect to [127.0.0.1:27017]

//db.js 链接代码修改如下 var Db = require(‘mongodb’).Db; var Connection = require(‘mongodb’).Connection; var Server = require(‘mongodb’).Server; //数据库连接信息host,port,user,pwd var db_name = ‘MOOEovYoNmLKlMCIfRdt’; // 数据库名，从云平台获取 var db_host = ‘mongo.duapp.com’; // 数据库地址 var db_port = ‘8908’; // 数据库端口 var username = ‘。。。’; // 用户名（API KEY） var password = ‘。。。’; // 密码(Secret KEY)

module.exports = new Db(db_name, new Server(db_host, db_port, {}), {w: 1});

//post.js 调用代码如下 var mongodb = require(’./db’); var moment = require(‘moment’);//时间模块 var formidable = require(“formidable”);//处理POST数据模块

function Post(username, post, target_path, time){ this.user = username; this.post = post; this.img = target_path; if (time) { this.time = time; }else{ this.time = new moment().format(“YYYY-MM-DD HH:mm:ss”); //console.log(moment().format()); }

}; module.exports = Post;

Post.prototype.save = function save(callback) { // 存入 MongoDB的文档 var post = { user: this.user, post: this.post, img: this.img, time: this.time, }; mongodb.open(function(err,db){ if(err) return callback(err); //读取post集合 db.authenticate("。。。", “。。。”, function(err, result) { if (err) { db.close(); console.log(err); return;
} db.collection(‘posts’,function(err, collection){ if (err) { mongodb.close(); return callback(err); }; //为user属性添加索引 collection.ensureIndex(‘user’); //写入post文档 collection.insert(post, {safe: true}, function(err, post){ mongodb.close(); callback(err, post); }); }); });

});

};

Post.get = function get(username, callback){ mongodb.open(function(err, db){ if (err) {return callback(err)}; db.authenticate("。。。", “。。。”, function(err, result) { if (err) { db.close(); console.log(err); return;
} db.collection(‘posts’, function(err, collection){ if(err) { mongodb.close(); return callback(err); }; //查找user属性为username的文档，如果username是null则匹配全部 var query = {}; if (username) { query.user = username; }; collection.find(query).sort({time: -1}).limit(30).toArray(function(err, docs){ mongodb.close(); if(err) { callback(err,null); };

				//封装posts为post对象
				var posts = [];
				docs.forEach(function(doc, index){
					var post = new Post(doc.user, doc.post, doc.img,doc.time);
					posts.push(post);
				});
				callback(null,posts);
			});
		});
	});	
});

}