1 ,軟件結構發(fā)展過程中的3個階段:
Model1模式?,?Model2模式?,?MVC模式
1>Model1最重要的特點就是沒有分層的概念?,?也就是說把界面
和業(yè)務邏輯的處理放在一個文件中來完成.
缺點:?1表現(xiàn)層和業(yè)務邏輯層混合在一起了,非常亂
?????2?在實際開發(fā)過程中?,?不利于多人協(xié)同開發(fā).
?????3?不利于后期的維護
優(yōu)點:?1?簡單,?開發(fā)速度比較快
?????2?比較適合開發(fā)小型項目
2>Model2?分層模式?:?把界面和業(yè)務邏輯分開編寫?,?好處就是結構清晰,?利于
分工開發(fā)?.?有些書上把這種分層模式稱為?MV模式?,?
即M-->Model?(業(yè)務邏輯層),?V-->View(界面層)
在開發(fā)中如何將Model1?模式的程序改成Model2?:
1?,?界面層用PHP?,?業(yè)務邏輯用類(類中封裝業(yè)務操作)
2?,?將常用的代碼(比如對數(shù)據庫的操作等)?,?封裝到類中?.?
3>MVC模式?:?實際上就是在分層模式下增加了控制器?.?
它強制性的使應用程序的輸入?,?處理和輸出分開?.?使用MVC應用程序被分為
三個核心部件?:?模型M?,?視圖V?,?控制器C
M主要由類來做?,?用于處理具體業(yè)務邏輯.
V主要用做界面?,?顯示數(shù)據.
C?用于去響應用戶的各種請求.
2 ,為什么使用MVC :?
我們發(fā)現(xiàn)在Model2模式中?,?界面不但充當顯示功能?,?
還處理各種請求?(比如把當前界面的的某條數(shù)據刪除),?但是隨著項目的不斷擴展?,?界面上會有很多請求?,?如果都寫在該界面的
代碼里會顯得非常亂?.?也就是說把某個請求直接交給界面層處理不是很好的?,?那么MVC模式就產生了?.?

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