Debug for profiling and logging

debug.js

var debug = debug || {};
debug = {
  on : false,
  startTime: 0,
  partialTime: 0,
  // start the profiling
  start : function(){
    debug.on = true;
    startTime = Date.now();
    partialTime = Date.now();
    log("======= DEBUG START =========");
  },
  // log with current time elapsed from start
  log : function(message){
    if (!debug.on) {
      return;
    } else {
      log("==" + (Date.now() - startTime) + "ms== " + message);
    }
  },
  // log with partial time elapsed and resets partial time
  logPart : function(message){
    if (!debug.on) {
      return;
    } else {
      log("--" +(Date.now() - partialTime) + "ms-- " + message);
      partialTime = Date.now();
    }
  },
  // end debug, log total time
  end : function(){
    if (!debug.on) {
      return;
    } else {
      log("======= DEBUG END: " + (Date.now() - startTime) + "ms =========");
    }
  }
}