<script type="text/javascript"> var Book = (function() { // 私有静态属性 var numOfBooks = 0; // 私有静态方法 function checkIsbn(isbn) { if(isbn == undefined || typeof isbn != 'string') { return false; } return true; } // 返回构造函数 return function(newIsbn, newTitle, newAuthor) { // implements Publication // 私有属性 var isbn, title, author; // 特权方法 this.getIsbn = function() { return isbn; }; this.setIsbn = function(newIsbn) { if(!checkIsbn(newIsbn)) throw new Error('Book: Invalid ISBN.'); isbn = newIsbn; }; this.getTitle = function() { return title; }; this.setTitle = function(newTitle) { title = newTitle || 'No title specified'; }; this.getAuthor = function() { return author; }; this.setAuthor = function(newAuthor) { author = newAuthor || 'No author specified'; }; // 控制对象数目，构造函数 numOfBooks++; // Keep track of how many Books have been instantiated // with the private static attribute. if(numOfBooks > 5) throw new Error('Book: Only 5 instances of Book can be ' + 'created.'); this.setIsbn(newIsbn); this.setTitle(newTitle); this.setAuthor(newAuthor); } })(); // 公有静态方法 Book.convertToTitleCase = function(inputString) { alert('convertToTitleCase'); }; // 公有非特权方法 Book.prototype = { display: function() { alert("isbn:"+this.getIsbn()+" title:"+this.getTitle()+" author:"+this.getAuthor()); } }; //var theHobbit = new Book(123, '', 'J. R. R. Tolkein'); // 非字符串抛出异常 var theHobbit = new Book('1990-78sd-1092', '', 'J. R. R. Tolkein'); theHobbit.display(); //theHobbit.convertToTitleCase(); // Uncaught TypeError: Object #<Object> has no method 'convertToTitleCase' Book.convertToTitleCase(); // 输出convertToTitleCase var theHobbit2 = new Book('1990-78sd-1092', '', 'J. R. R. Tolkein'); theHobbit2.display(); var theHobbit3 = new Book('1990-78sd-1092', '', 'J. R. R. Tolkein'); theHobbit3.display(); var theHobbit4 = new Book('1990-78sd-1092', '', 'J. R. R. Tolkein'); theHobbit4.display(); var theHobbit5 = new Book('1990-78sd-1092', '', 'J. R. R. Tolkein'); theHobbit5.display(); var theHobbit6 = new Book('1990-78sd-1092', '', 'J. R. R. Tolkein'); theHobbit6.display(); // Uncaught Error: Book: Only 5 instances of Book can be created. </script>
这里已经把js出神入化了，佩服到极致，代码清晰简洁，美观，注释恰到好处。
更多关于JavaScript相关内容可查看本站专题：《JavaScript常用函数技巧汇总》、《javascript面向对象入门教程》、《JavaScript中json操作技巧总结》、《JavaScript切换特效与技巧总结》、《JavaScript查找算法技巧总结》、《JavaScript动画特效与技巧汇总》、《JavaScript错误与调试技巧总结》、《JavaScript数据结构与算法技巧总结》、《JavaScript遍历算法与技巧总结》及《JavaScript数学运算用法总结》