JS实现简单的图书馆享元模式实例

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 /*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>

希望本文所述对大家的javascript程序设计有所帮助。