JS实现简单的图书馆享元模式实例

时间：2021-05-26

本文实例讲述了JS实现简单的图书馆享元模式。分享给大家供大家参考。具体如下：

<!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 ){ 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; }, updateCheckoutStatus : function(booId,checkoutDate,checkoutMember){ this.id = bookId; this.checkoutDate = checkoutDate; this.checkoutMember = checkoutMember; } }; //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() 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(){ } } })();</script></body></html>

希望本文所述对大家的javascript程序设计有所帮助。

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