code: function extend() {
    var result = {};
    var objs = Array.prototype.slice.call(arguments,0);
    objs.forEach(function(props, index){
      for(var prop in props) {
        if(props.hasOwnProperty(prop)) {
          result[prop] = props[prop]
        }
      }
    });
    return result;
  }
docs: Extend multi objects.
  @returns {object}