faux-console.js

var console = console || {
  log : function(args){
    this.print('black', arguments)
  },
  
  error : function(args) {
    this.print('red', arguments)
  },
  
  // ... etc
  
  print : function(color, args) {
    for (i = 0, len = args.length; i < len; ++i)
      print(this.color(args[i], color))
  },
  
  color : function(string, color) {
    return "\u001B[" + {
      black : 30,
      red   : 31,
      green : 32,
    }[color] + 'm' + string + "\u001B[0m"
  }
}



console.log('test', 'foo');
console.error('test', 'foo', 'bar');