January 2001
Beginner
312 pages
6h 4m
English
Content preview from JavaScript™ 1.5 by Example
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Troubleshooting!
What is wrong with the following examples?
Example 1
<html> <head> <title>A Simple Page</title> <script language="JavaScript"> <!-- Cloaking device on! var msg1 = "Hello there", num1 = 22; alert(msg11); alert(num1); // Cloaking device off --> </script> </head> <body> </body> </html>
ANSWER: The first alert() method is displaying a variable that hasn't been created or had a value assigned to it (msg11). This is an example of an undefined value.
Example 2
<html> <head> <title>A Simple Page</title> <script language="JavaScript"> <!-- Cloaking device on! var msg1 = "Hello there" num1 = 22; alert(msg1); alert(num1); // Cloaking device off --> </script> </head> <body> </body> </html>
ANSWER: No comma separates the variables in ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.