banhaclong20/Generate Unique Number in JavaScript

## Generate Unique Number in JavaScript
function uniqueNumber() {
    var date = Date.now();

    if (date <= uniqueNumber.previous) {
        date = ++uniqueNumber.previous;
    } else {
        uniqueNumber.previous = date;
    }

    return date;
}

uniqueNumber.previous = 0;

function ID(){
  return uniqueNumber();
};
	function uniqueNumber() {
	var date = Date.now();

	if (date <= uniqueNumber.previous) {
	date = ++uniqueNumber.previous;
	} else {
	uniqueNumber.previous = date;
	}

	return date;
	}

	uniqueNumber.previous = 0;

	function ID(){
	return uniqueNumber();
	};