Lesson 6:Advanced features

Lesson 6: Advanced Features

**Array Object**
New arrays are created with the Array() constructor, which may take a positive integer to set length of array but is not required.
Properties length=length of array		Methods join(Character)= returns string made up of all array values, values separated by the character specified in parenthesis reverse()= reverses array index
Example Properties		Example Methods

**images[] array**
Object, property of the docuemnt object. Array created as index of all images HTML img src tag marks up. Background image is NOT indexed. Only property most browsers allow changes is src.

Properties border = image border in pixels height= image height in pixels hspace = image horizontal setting in pixels name= set with HTML name attribute in img tag src=URl of image source vspace=image vertical padding in pixels width= image width in pixels

External Files
Several web pages on a site may require the same JavaScript function or code. Rather than have to type the same code in for every page, the code can be saved in a text file with the file extension ".js". The ".js" file contains only the actual JavaScript code, without the <script language=JavaScript> </script> HTML tags.

To access the external file on the web page, the <script language=JavaScript> </script> HTML tags are slightly changed by the addtion of an additional attribute: