tailieunhanh - JavaScript Bible, Gold Edition part 116

JavaScript Bible, Gold Edition part 116. This book will bring programmers and non-technical professionals, including casual programmers and scripters, painlessly up to speed on all aspects of mastering JavaScript. Key topics include programming fundamentals, JavaScript language elements and how to use them effectively, and how to easily and efficiently add powerful new functionality to HTML documents and Java applets. | 998 Part IV JavaScript Core Language Reference When you need to call upon that function which has essentially become a new temporary method for the Array object invoke it as you would any object method. Therefore if an array named CDCollection has been created and a prototype method showCoverImage has been attached to the array the call to invoke the method for a tenth listing in the array is 9 where the parameter of the function uses the index value to perhaps retrieve an image whose URL is a property of an object assigned to the 10th item of the array. Array Object Methods After you have information stored in an array JavaScript provides several methods to help you manage that data. These methods all of which belong to array objects you create have evolved over time so observe carefully which browser versions a desired method works with. array2 Returns array Object. NN2 NN3 NN4 NN6 IE3 J1 IE3 J2 IE4 IE5 Compatibility The method allows you to join two array objects into a new third array object. The action of concatenating the arrays does not alter the contents or behavior of the two original arrays. To join the arrays you refer to the first array object to the left of the period before the method a reference to the second array is the parameter to the method. For example var arrayl new Array 1 2 3 var array2 new Array a b c var array3 array2 result array with values 1 2 3 a b c If an array element is a string or number value not a string or number object the values are copied from the original arrays into the new one. All connection with the original arrays ceases for those items. But if an original array element is a reference to an object of any kind JavaScript copies a reference from the original array s entry into the new array. So if you make a change to either array s entry the change occurs to the object and both array entries reflect the change to the object. On he Example with .