Models, which contain or represent the data that users work with. These can be simple view models, which just represent data being transferred between views and controllers; or they can be domain models, which contain the data in
a business domain as well as the operations, transformations, and rules for
manipulating that data.
Views, which are used to render some part of the model as a UI.
Controllers, which process incoming requests, perform operations on the model,and select views to render to the user.
模型：包含用戶要處理的數據，分爲view models和domain models，業務邏輯放到這裏面
視圖：僅僅負責將模型展示出來
控制器：執行請求、對模型的操作並選擇視圖展示給用戶
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