Defining and Calling a Custom Function in JavaScript
function checkNumber(aNumber) {
if (aNumber > 0 && aNumber < 100) {
////////////////////////////////////////////////////
// If the number is greater than 0 and less than
// 100, pop up a “congratulations” message and return
// a value indicating success.
////////////////////////////////////////////////////
alert(“The number you specified is valid (it is between 0 and 100).”)
return true
}
////////////////////////////////////////////////////////
// Otherwise, the number is negative or over 100,
// so return a value indicating failure.
////////////////////////////////////////////////////////
else {
alert(“The number you specified is invalid (not between 0 and 100).
\nPlease try again.”)
return false
}
}
...
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