JS Bin// source https://jsbin.com/voqihuw

logging.js

var Logger = function(enable, prefix) {
    this.log = {};
    if ((typeof globalEnableLogger !== 'undefined' && globalEnableLogger == false) || enable == false) {
        for(var m in console) {
            if(typeof console[m] == 'function') {
                this.log[m] = function(){};
            }
        }
    } else if (enable && typeof enable === 'string') {
        for (var m in console) {
            if (typeof console[m] == 'function') {
                this.log[m] = console[m].bind(window.console, enable+":");
            }
        }
    } else if (enable && prefix) {
        for (var m in console) {
            if (typeof console[m] == 'function') {
                this.log[m] = console[m].bind(window.console, prefix+":");
            }
        }
    } else if (enable || typeof enable === 'undefined') {
        for (var m in console) {
            if (typeof console[m] == 'function') {
                this.log[m] = console[m].bind(window.console);
            }
        }
    }
    return this.log;
}

//var globalEnableLogger = false;
var logPlain = Logger();
var logUndef = Logger(undefined);
var logTrue = Logger(true);
var logFalse = Logger(false);
var logName = Logger(false, "MyName");
var logOnlyName = Logger("NameOnly");

//log some stuff
logPlain.info('should work');
console.log('console log on the next line!');
logUndef.info('should also work');
logTrue.info('should definitely work');
logFalse.info('should not work');
logName.info('has prefix MyName');
logOnlyName.info('has prefix NameOnly');

var MyClass = function() {
  this.log = Logger('MyClass');
  this.log.warn('It works in classses');
  this.log.trace('hello trace');
  initialize();
  return {
    teststuff: teststuff,
    funstuff: funstuff,
    log: this.log
  };
  function initialize(){
    this.log.trace('begin init');
    logName.error('test');
  }
  function teststuff(msg){
    this.log.info('rawr4'+msg);
    return msg+'rawr2';
  }
  function funstuff(msg2){
    var obj = {};
    obj.rawr5 = 'testing3'+msg2;
    this.log.info(obj);
    return obj;
  }
}

var mc = new MyClass();
mc.funstuff(mc.teststuff('testing1'));