什麼是原型——JS

原創 Manson_Wang 2020-06-21 09:12

總

    原型就是存儲方法或屬性的對象；構造函數創建出來的實例，能夠使用原型裏面的方法，簡單來說，原型能夠實現繼承。

分

    1. 構想函數一旦定義好，原型就創建了；

    2. 原型本身是個對象，裏面存儲了方法或者屬性；

    3. 構造函數創建的實例對象，實例對象在調用某一個方法或屬性時，如果當前對象構造函數定義裏沒有規定這個屬性或者方法，那麼就去對應的原型屬性中去找。

所以說當前對象沒有這個方法，直接調用了原型對象中的方法，實現了繼承。

總

    對象繼承自原型對象

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