Posted Monday, December 6, 2004
Start at the Beginning
Comment, Comment, Comment
Commenting code allows you, or someone else looking at it, to understand what's occuring in the code. Commenting can be done in both single and multi-line variations:
// single line comments
Numeric: var x = 0;
String: var y = "hello";
Variables: var z = x + y;
Object: var myImage = new Image();
Ex: var x = hello ** wrong
Variables that store numbers and strings can be combined in a new variable. However, if anything is combined with a string, it is automatically be treated as a string.
Ex: var y = "1";
var z = "2";
var a = y + z;
The variable "a" in this instance is "12" not 3, since the two strings were combined together as text, not added like numbers. This would be true even if y = 1.
Making a Statement
Examples of alerts
alert("this is a string");
creates an alert that will contain the text"this is a string"
creates an alert that will contain the value defined in variable x (make sure that variable x is defined before calling it)
alert("the number is " + x);
-creates an alert that will combine text and the value in x.
It Can Do Math Too?
greater than >
less than <
greater than or equal >=
less than or equal
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(C) Copyright 2002. Lisa Spurlin
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