A function is a block of code designed to perform a particular task.
A JavaScript function is defined with the function keyword, followed by a name, followed by parentheses ().
Function names can contain letters, digits, underscores, and dollar signs (same rules as variables).
The parentheses may include parameter names separated by commas:
(parameter1, parameter2, ...)
The code to be executed, by the function, is placed inside curly brackets: {}
function funName(parameter1, parameter2, parameter3) { // code to be executed }
function funName(arg1,arg2) { var r; r = arg1 + arg2; //Actions return r; //The function returns sum of arguments }
See also Writing Your First JavaScript Program
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