Useful javascript variables and functions used frequently

gistfile1.js

// null function
var nullfn = function() {};

// random number generator, within a certain range
var random = function(min, max) {
  return Math.random() * (max - min) + min;
};
var randomInt = function(min, max) {
  return Math.floor(Math.random() * (max - min + 1)) + min;
};

// current unix timestamp, unit is seconds, with precision 3
var time = function() {
  return (new Date()).getTime() / 1000;
};