nodejs中循环中套异步+解决async模块

var async=require("async");
var mysql=require("mysql");
var datalist = [{number:10},{number:20},{number:30},{number:40},{number:50}];
var count = 0;
var conn=mysql.createConnection({
    host : "127.0.0.1",
    user : "root",
    password: "",
    port: "3306",
    database:"langjie"
});
var test = function () {
    return count

自己的代码

var mysql=require("mysql")
var async=require("async");
var list="";
var conn=mysql.createConnection({
    host : "127.0.0.1",
    user : "root",
    password: "",
    port: "3306",
    database:"langjie"
});
conn.connect(function(){
    console.log("连接数据库succ")
});
conn.query("select * from tablel",function(err,results){
    if(err){console.log(err)}else{
        list=results;
    }

    var count = 0;
    var test = function () {
        return count

连接地址：http://blog.csdn.net/zzwwjjdj1/article/details/51857959