console.log

log

var type = function(s) {
    return Object.prototype.toString.call(s).slice(8,-1).toLowerCase();
};

var log = function() {
  var color = 'background: #000;color: yellow;padding: 0 3px';
  var string = '%c';//'%c';
  for ( var i = 0, l = arguments.length; i < l; i++ ) {
      var t = type(arguments[i]);
      switch(t) {
           case 'string':
               string += '%s';
               break;
           case 'number':
               string += ( '' + arguments[i] ).indexOf('.') > -1 ? '%f' : '%d';
               break;
           case 'object':
               string += '%O';
               break;
           default:
               if ( t.indexOf('html') > -1 ) {
                   string += '%o';
               }
               else {
                   string += '%s';
               }
               break;   
      }
  }
  var argus = [].concat.apply( [ string, color ], arguments );
  console.log.apply( console, argus );
};

log( null, undefined, 'string', 1, 1.2, [1], {a:'a',b:'b'}, document.body);