JS模式:简单的图书馆享元模式

<!DOCTYPE html>
<html>
<head>
    <title></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>

 

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