JS實現簡單的圖書館享元模式實_例

2019-11-02 14:36:49

字體：大中小

來源：轉載

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　　本文實例講述了JS實現簡單的圖書館享元模式。分享給大家供大家參考。具體如下：

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 <!DOCTYPE html> <html> <head> <title>享員模式</title> </head> <body> <script> /* *flyweight 享員模式 */ //例子是一個圖書館存書借書 ->_-> var Book = function(id, title, author, genre, pageCount, publisherId, ISBN, checkoutDate, checkoutMember /*還有一些*/){ this.id = id; this.title = title; this.author = author; this.genre = this.genre; this.pageCount = pageCount; this.publisherId = publisherId; this.ISBN = ISBN; /*...*/ this.checkoutDate = checkoutDate; this.checkoutMember = checkoutMemb

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er; }; Book.prototype = { getTitle : function(){ return this.title; }, getAuthor : function(){ return this.author; }, getISBN : function(){ return this.ISBN; }, /*__more.._*/ updateCheckoutStatus : function(booId,checkoutDate,checkoutMember){ this.id = bookId; this.checkoutDate = checkoutDate; this.checkoutMember = checkoutMember; /*_more.._*/ } }; //下面介紹享元的版本；PS（使用了一個OBJ存書籍，這樣就可以存多的書） var BookFactory = (function(){ var existingBooks = {},existingBook; return { createBook : function(title,author,genre,ISBN){ existingBook = existingBooks[ISBN]; if(existingBook){ return existingBook; }else{ var book = new Book(/*_moreData_bookInfo == _*/) return existingBooks[ISBN] = book; } } } })(); var BookRecordManager = (function(){ var bookRecordDatabase = {}; return { addBookRecord : function(id,ISNB/* == */){ var book = BookFactory.createBook(/**/); bookRecordDatabase[id] = { checkoutDate : checkoutDate, checkoutMember : checkoutMember }; }, updateCheckoutStatus : function(bookId,xx){ bookRecordDatabase[bookId] = { xx : tt, oo : yy } }, extend : function(){ /*自定義各種公用方法了*/ } } })(); </script> </body> </html>

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