This article describes the generation method of JS anonymous function class. Share it for your reference, as follows:
<script type="text/javascript">
var Book = (function() {
// Private static properties var numOfBooks = 0;
// Private static method function checkIsbn(isbn) {
if(isbn == undefined || typeof isbn != 'string') {
return false;
}
return true;
}
// Return the constructor return function(newIsbn, newTitle, newAuthor) { // implements Publication
// Private attributes var isbn, title, author;
// Privileged method = function() {
return isbn;
};
= function(newIsbn) {
if(!checkIsbn(newIsbn)) throw new Error('Book: Invalid ISBN.');
isbn = newIsbn;
};
= function() {
return title;
};
= function(newTitle) {
title = newTitle || 'No title specified';
};
= function() {
return author;
};
= function(newAuthor) {
author = newAuthor || 'No author specified';
};
// Control the number of objects and construct the function 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.');
(newIsbn);
(newTitle);
(newAuthor);
}
})();
// Public static method = function(inputString) {
alert('convertToTitleCase');
};
// Public non-privileged method = {
display: function() {
alert("isbn:"+()+" title:"+()+" author:"+());
}
};
//var the Hobbit = new Book(123, '', 'J. R. R. Tolkien'); // Non-string throws an exceptionvar theHobbit = new Book('1990-78sd-1092', '', 'J. R. R. Tolkein');
();
//(); // Uncaught TypeError: Object #<Object> has no method 'convertToTitleCase'
(); // Output convertToTitleCasevar theHobbit2 = new Book('1990-78sd-1092', '', 'J. R. R. Tolkein');
();
var theHobbit3 = new Book('1990-78sd-1092', '', 'J. R. R. Tolkein');
();
var theHobbit4 = new Book('1990-78sd-1092', '', 'J. R. R. Tolkein');
();
var theHobbit5 = new Book('1990-78sd-1092', '', 'J. R. R. Tolkein');
();
var theHobbit6 = new Book('1990-78sd-1092', '', 'J. R. R. Tolkein');
(); // Uncaught Error: Book: Only 5 instances of Book can be created.
</script>
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I hope this article will be helpful to everyone's JavaScript programming.