/**
 * $class 写类工具函数之三
 * @param {String} className
 * @param {String} superClass
 * @param {Function} classImp
 */
function $class(className, superClass, classImp){
	if(superClass === "") superClass = Object;
	var clazz = function(){
		return function(){
			if(typeof this.init == "function"){
				this.init.apply(this, arguments);
			}
		};
	}();
	var p = clazz.prototype = new superClass();
	var _super = superClass.prototype;
	window[className] = clazz;
	classImp.apply(p, [_super]);
}

$class('Person', '', function(){
	// 构造函数
	this.init = function(name){
		this.name = name;
	};
	// 方法体
	this.getName = function(){
		return this.name;
	};
	this.setName = function(name){
		this.name = name;
	};
});

var p = new Person('Jack');
console.log(p); 
console.log(p.constructor == Person); // false