A variable is the name given to a location in a computer's memory where data is stored.
var i, j, k
var isMouseOverLink, helloMessage
Once a variable is declared, it is then ready to be filled with its first value. This initializing is done with the assignment operator, =. You can initialize a variable at the same time it is declared or at any point thereafter in your script. Assigning a value when the variable is declared can help you remember what type of value you originally meant the variable to hold.
Scope of Variables
The scope of a variable refers to the area or areas within a program where a variable can be referenced. Suppose you embed one script in the head f an HTML document and another script (using another set of script tags) in the body of the same HTML document.
Local: A variable declared inside a function is local in scope. Only that function has access to the value that the variable holds. Each time the function is called, the variable is created. Likewise, each time the function ends, the variable is destroyed.
Global: If you want more than one function to share a variable, you declare the variable outside of any functions (but, of course, inside the <SCRIPT> tags). With this method, any part of your application, including all functions, can share one instance of a variable. I recommend that you declare global.
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