本文實例講述了js初始化驗證的方法。分享給大家供大家參考，具體如下：
<script type="text/javascript">var Book = function(isbn, title, author) { if(!this.checkIsbn(isbn)){ throw new Error('Book: Invalid ISBN.'); } this.isbn = isbn; this.title = title || 'No title specified'; this.author = author || 'No author specified';}Book.prototype = { checkIsbn: function(isbn) { if(isbn == undefined || typeof isbn != 'string') { return false; } return true; // All tests passed. }, display: function() { alert("isbn:"+this.isbn+" title:"+this.title+" author:"+this.author); }};var theHobbit = new Book('0-395-07122-4', 'The Hobbit', 'J. R. R. Tolkein');theHobbit.display(); // Outputs the data by creating and populating an HTML element.</script>對isbn進行驗證。是否定義，是否為字符串等等。對title進行判斷，設置默認。
另一種實現方式
<script type="text/javascript">/* 出版 interface. *//* var Publication = new Interface('Publication', ['getIsbn', 'setIsbn', 'getTitle', 'setTitle', 'getAuthor', 'setAuthor', 'display']); */var Book = function(isbn, title, author) { // implements Publication this.setIsbn(isbn); this.setTitle(title); this.setAuthor(author);}Book.prototype = { checkIsbn: function(isbn) { if(isbn == undefined || typeof isbn != 'string') { return false; } return true; // All tests passed. }, getIsbn: function() { return this.isbn; }, setIsbn: function(isbn) { if(!this.checkIsbn(isbn)) throw new Error('Book: Invalid ISBN.'); this.isbn = isbn; }, getTitle: function() { return this.title; }, setTitle: function(title) { this.title = title || 'No title specified'; }, getAuthor: function() { return this.author; }, setAuthor: function(author) { this.author = author || 'No author specified'; }, display: function() { alert("isbn:"+this.isbn+" title:"+this.title+" author:"+this.author); }};var theHobbit = new Book('0-395-07122-4', '', 'J. R. R. Tolkein');theHobbit.display(); // Outputs the data by creating and populating an HTML element.</script>接口實現，參考接口，定義了好多方法。
內部方法命名加_，例如這個檢測的方法 _checkIsbn
<script type="text/javascript">/* 出版 interface. *//* var Publication = new Interface('Publication', ['getIsbn', 'setIsbn', 'getTitle', 'setTitle', 'getAuthor', 'setAuthor', 'display']); */var Book = function(isbn, title, author) { // implements Publication this.setIsbn(isbn); this.setTitle(title); this.setAuthor(author);}Book.prototype = { _checkIsbn: function(isbn) { if(isbn == undefined || typeof isbn != 'string') { return false; } return true; // All tests passed. }, getIsbn: function() { return this.isbn; }, setIsbn: function(isbn) { if(!this._checkIsbn(isbn)) throw new Error('Book: Invalid ISBN.'); this.isbn = isbn; }, getTitle: function() { return this.title; }, setTitle: function(title) { this.title = title || 'No title specified'; }, getAuthor: function() { return this.author; }, setAuthor: function(author) { this.author = author || 'No author specified'; }, display: function() { alert("isbn:"+this.isbn+" title:"+this.title+" author:"+this.author); }};//var theHobbit = new Book(123, '', 'J. R. R. Tolkein'); // 非字符串拋出異常var theHobbit = new Book('1990-78sd-1092', '', 'J. R. R. Tolkein'); theHobbit.display(); // Outputs the data by creating and populating an HTML element.</script>更多關于JavaScript相關內容可查看本站專題：《javascript面向對象入門教程》、《JavaScript中json操作技巧總結》、《JavaScript切換特效與技巧總結》、《JavaScript查找算法技巧總結》、《JavaScript動畫特效與技巧匯總》、《JavaScript錯誤與調試技巧總結》、《JavaScript數據結構與算法技巧總結》、《JavaScript遍歷算法與技巧總結》及《JavaScript數學運算用法總結》
希望本文所述對大家JavaScript程序設計有所幫助。
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