第一次用node.js写 第一次玩mangoDB 第一次使用文件 优化空间很大。。谢谢观赏 ：http://callme.cnodejs.net/

js代码：

var http = require('http'),
    db = require('./config').db;
fs = require('fs');
var path = "html/index.html";
http.createServer(function(req, res){
    fs.readFile(path, "binary", function(err, file) {
        if(err) {
            res.writeHead(200, {"Content-Type": "text/plain"});
            res.write(path+" Not Found\n");
            res.end();
            return;
        }
        res.writeHead(200, {"content-type":"text/html;charset=utf8"});
        res.write(file, "binary");
        showCount(res,1);
    });
}).listen(80);
console.log("server started at port 80");
function showCount(res,layer){
    if (layer>3){
        console.log("DB Init failed");
        res.end("
悲剧...计数器初始化失败...</body></html>");
    }
    if (!dbconn){
        var dbconn = db.collection("RequestCount");
        console.log("Connect to 'RequestCount'");
    }
    dbconn.findOne({name:"counter"}, function (err, data) {
        if (err) {
            console.log("findOne {name:\"counter\"} failed-> DB try Init..");
            dbconn.save({name:"counter", count:0}, function (err) {
                if (err) {
                    console.log("save {name:\"counter\", count:1} failed -> DB try Init..");
                }
                console.log("DB try Init Successed!");
                showCount(res, layer + 1);
            })
        } else {
            if (!data){
                console.log("data is null -> DB try Init..");
                dbconn.save({name:"counter", count:0}, function (err) {
                    if (err) {
                        console.log("save {name:\"counter\", count:1} failed -> DB try Init..");
                    }
                    console.log("DB try Init Successed!");
                    showCount(res, layer + 1);
                })
            }
            var newcount = data.count + 1;
            console.log("Count update to" + newcount);
            dbconn.update(
                {name:"counter"},
                {$set:{count:newcount}},
                function (err) {
                    if (err) {
                        console.log("DB update failed");
                        showCount(res, layer + 1);
                    }
                }
            )
            res.end("
您是获得了第" + newcount + "次请求的围观群众.</body></html>");
        }
    });
}

That‘s all 欢迎拍砖。。。。