JavaScript Tutorial Part I- Some Basics
By Will Bontrager2004-02-09
How to make your program remember things
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You can specify stuff that the JavaScript program must remember. And you can access that remembered stuff later on.
In order to store stuff in memory and access it later, that memory spot must have a name. The memory spot, itself, is called a "variable" because the contents of the memory spot can change.
To declare that a variable exists and give it a name, you type something like
var blahblah;
which creates a variable called "blahblah" where you can store stuff.
To store something into that memory spot, you type something like
blahblah = 5;
and the number "5" is stored in (assigned to) that memory spot.
You can also do all the above in one line, if you want, by typing
var blahblah = 5;
However, once a variable name has been declared, don't declare it again. If, later on in the program, you want to change the contents of the variable "blahblah", do it as a simple assignment statement, like
blahblah = 4;
To access what you have stored in a variable (the value you assigned to it), you either have to print it (have it show up on your web page) or assign it to another variable. To print it to your web page, you type
document.write(blahblah);
and, when interpreted and executed, that program line will print the value of "blahblah" on your web page.
Tutorial Pages:
» JavaScript Tutorial Part I- Some Basics
» Orientation
» How the browser knows it is JavaScript
» This is how JavaScript works
» Some programming basics
» How to make your program remember things
» Here it is, all put together
» Using strings of characters
» To come
Copyright 2004 Bontrager Connection, LLC
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