<!DOCTYPE html> <html> <head> <title>享员模式</title> </head> <body> <script> /* *flyweight 享员模式 */ //例子是一个图书馆存书借书 ->_-> var Book = function(id, title, author, genre, pageCount, publisherId, ISBN, checkoutDate, checkoutMember /*还有一些*/){ 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 = checkoutMember; }; 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.._*/ } }; //下面介绍享元的版本；PS（使用了一个OBJ存书籍，这样就可以存多的书） 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(){ /*自定义各种公用方法了*/ } } })(); </script> </body> </html>
JS实现简单的图书馆享元模式实例
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