javascript框架之继承机制2
我们来模仿一下最OO的mootools的继承机制。它的类都有一个叫做initialize构造方法,这与Java的类都有一个与类名同名的构造方法一样的道理。只不过,这些叫initialize或init都是借鉴自Prototype,而Prototype那帮人是Ruby出身。为了区别mootools那种污染原生方法的做法,我把类的构造器命名为variant,并且禁止查看构造方法(像浏览器禁止查看原生对象的构造方法那样)。
var variant = function (options){
options = options || {};
var initialize = options.initialize || function(){};
var klass = initialize ;
klass.constructor = arguments.callee;
klass.prototype.constructor = klass;
klass.toString = function(){//禁止查看构造方法
return "function variant(){\n [variant code]\n}"
}
return klass;
};
var Person = variant({initialize:function(age){
this.age = age;
}});
alert(Person)//看不到构造方法的实现
var p = new Person(3);
alert(p)
alert(p.age);
alert(p.constructor);//看不到构造方法的实现
var P = variant({})
var a = new P;
alert(a);
运行代码
var variant = function (options){
options = options || {};
var initialize = options.initialize || function(){};
var klass = initialize ;
klass.constructor = arguments.callee;
klass.prototype.constructor = klass;
klass.toString = fu
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