Klass

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function Klass(Parent, props) {
  var Child, F, i;

  // 新构造函数
  Child = function(){
    if (Child.uber && Child.uber.hasOwnProperty('__construct')) {
      Child.uber.__construct.apply(this, arguments);
    }

    if (Child.prototype.hasOwnProperty('__construct')) {
      Child.prototype.__construct.apply(this, arguments);
    }
  };

  // 继承
  Parent = Parent || Object;
  F = function(){};
  F.prototype = Parent.prototype;
  Child.prototype = new F();
  Child.uber = Parent.Prototype;
  Child.prototype.constructor = Child;

  // 添加实现方法
  for (i in props) {
    if (props.hasOwnProperty(i)){
      Child.prototype[i] = props[i];
    }
  }

  return Child;
}