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                # 工廠模式 當需要實例化的類比較復雜,需要在實例化之前進行一些處理的時候,可以采用工廠模式,創建一個工廠方法,專門生產示例。 有簡單工廠模式和復雜工廠模式。 ## 簡單工廠模式 示例 ```js function CreatePerson(name,age,sex) { var obj = new Object(); obj.name = name; obj.age = age; obj.sex = sex; obj.sayName = function(){ return this.name; } return obj; } ``` js 中的 new操作本質上也是一個簡單工廠模式 ```js new Animal('cat') = { var obj = {}; obj.__proto__ = Animal.prototype; var result = Animal.call(obj,"cat"); return typeof result === 'object'? result : obj; } ``` ## 復雜工廠模式 將其成員對象的實列化推遲到子類中,子類可以重寫父類接口方法以便創建的時候指定自己的對象類型。
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