JavaScript expression to generate a 5-digit number in every case

if you want to generate say a zipcode, and don't mind leading zeros as long as it's 5 digits you can use:

(""+Math.random()).substring(2,7)

What about:

Math.floor(Math.random()*90000) + 10000;

Yes, you can create random numbers in any given range:

var min = 10000;
var max = 99999;
var num = Math.floor(Math.random() * (max - min + 1)) + min;

Or simplified:

var num = Math.floor(Math.random() * 90000) + 10000;

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