Created
July 26, 2013 06:34
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Ext 继承实现类源码分析
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| /** | |
| * spirit from ext2.0 | |
| */ | |
| _.extend = function() { | |
| /** | |
| * 覆盖实例成员 | |
| * @param E | |
| * @constructor | |
| */ | |
| var C = function(E) { | |
| for (var D in E) { | |
| this[D] = E[D]; | |
| } | |
| }; | |
| var e = Object.prototype.constructor; | |
| // 声明构造属性 | |
| /** | |
| * 继承，并由传递的值决定是否覆盖原对象的属性 | |
| * @param G superclass 父类 被继承 | |
| * @param O（该参数可选） 一个对象，将它本身携带的属性对子类进行覆盖 | |
| */ | |
| return function(G, O) { | |
| // 重新定义了函数 J = subclass 子类，用于继承（该类继承了父类所有属性，并最终返回该对象） | |
| var J = function() { | |
| G.apply(this, arguments); | |
| } | |
| var E = function() { | |
| }, H, D = G.prototype; | |
| // 父类属性 | |
| E.prototype = D; | |
| // 赋值父类构造属性 | |
| // 下面两句就是上面最简单的继承实现 | |
| H = J.prototype = new E(); | |
| H.constructor = J; | |
| // 添加了superclass属性指向父类的Prototype | |
| J.superclass = D; | |
| // J.superclass = G.prototype | |
| if (D.constructor == e) { | |
| D.constructor = G; | |
| } | |
| // 为[J]和[H]添加override函数 | |
| J.override = function(F) { | |
| _.override(J, F); | |
| // F对象被J对象重写 | |
| }; | |
| // H 是子类J的属性（例：H.superclass = J.prototype.supperclass = G.prototype ） | |
| // J.prototype.supperclass = G.prototype | |
| H.superclass = H.supr = (function() { | |
| return D; | |
| }); | |
| // H.override = J.prototype.override | |
| H.override = C; | |
| // 覆盖掉子类prototype中的属性 | |
| _.override(J, O); | |
| // 定义子类J的extend继承函数 | |
| J.extend = function(F) { | |
| return _.extend(J, F) | |
| }; | |
| return J; | |
| } | |
| }(); |
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