new创建对象的过程发生了什么
var Person = function() {
this.aaa = "aaa";
this.bbb = "bbb";
this.ccc = function() {
alert(this.aaa);
};
}
var person1 = new Person();
person1.ccc();
var person2 = new Object();
Person.call(person2); // call : fun.call(thisArg, arg1, arg2, ...)
person2.__proto__ = Person.prototype;
