JS 面向对象 继承与重写
习惯于面向对象的编程方式，对继承一定不陌生，在JS，如何实现呢？
参考EXTJS
Cooker.apply(Cooker, { /** * 扩展 * * @param {Function} subclass * @param {Function} superclass * @param {Object} overrides * @return {Function} 扩展后的对象 */ extend: (function() { var inlineOverrides = function(o) { for (var m in o) { if (!o.hasOwnProperty(m)) { continue; } this[m] = o[m]; } }; return function(subclass, superclass, overrides) { var objectConstructor = Object.prototype.constructor; if (Cooker.isObject(superclass)) { overrides = superclass; superclass = subclass; subclass = overrides.constructor !== objectConstructor? overrides.constructor : function() { superclass.apply(this, arguments); }; } var F = function() {}, subclassProto, superclassProto = superclass.prototype; F.prototype = superclassProto; //设置子类对象的原型 subclassProto = subclass.prototype = new F(); // subclassProto.constructor = subclass; // subclass.superclass = superclassProto; if (superclassProto.constructor === objectConstructor) { superclassProto.constructor = superclass; } subclass.override = function(overrides) { Cooker.override(subclass, overrides); }; subclassProto.override = inlineOverrides; // subclassProto.proto = subclassProto; subclass.override(overrides); subclass.extend = function(o) { return Cooker.extend(subclass, o); }; return subclass; }; })(),/** * * 重写 * * @param target: 要重写的对象 * @param overrides:要重写/追加的属性 * */override: function(target, overrides){ if(target){ var p = target.prototype; for(var method in overrides){ p[method] = overrides[method]; } }}});