11.22.05 CISC103

Look at the "more notes" link on the main course web page,
and go to dynHTML.html


Robert Fraze gets an extra credit point for pointing out that in Windows,
you can do alt-F4 to close the top window....

we were able to use this to get out of a JavaScript script that had gone awry.


We saw a practical use of the % operator, which, as a reminder,
stands for the remainder after division:

In the abstract, you might get a problem like this to test your
knowledge of the mod operator (%)

problem  answer
5 % 3     2
27 % 2    1
29 % 3    2


A more practical use is when, for example, the secondCounter in a page
counts up 0, 1, 2, 3, 4, 5, 6, 7, etc.

you can use 

if (secondCounter % 4 == 0)

to something once every four seconds.

You could also use 

  secondCounter % 4 

to index into an array of four pictures and show a different picture
each time... since the indices of an array with four elements are 0, 1, 2, 3