nodejs 模块变量 应用

exports.allcodeandname=(function(){
    var fs = require('fs');
    var data = fs.readFileSync(__dirname+'/areacode',{encoding:'utf-8'});
    var lines = (data + '').split('\n');
    var allcodeandname={};
    lines.forEach(function(line){
        var infos=line.split(' ');
        allcodeandname[infos[0]]=infos[1];
    });
    return allcodeandname;
})()

var  analysicstatus= (function(){
    var _value = 0;//
    function set(num){
        _value=num;
    }
    function get(){
        return _value;
    }

    return {
        set:set,
        get:get
    }

})();