yoko/Number.prototype.toFormatString.html

## Number.prototype.toFormatString.html
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8"/>
<title>toFormatString</title>
<link rel="stylesheet" href="http://github.com/jquery/qunit/raw/master/qunit/qunit.css"/>
<script src="http://github.com/jquery/qunit/raw/master/qunit/qunit.js"></script>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>
<script src="Number.prototype.toFormatString.js"></script>
</head>
<body>
<h1 id="qunit-header">toFormatString</h1>
<h2 id="qunit-banner"></h2>
<h2 id="qunit-userAgent"></h2>
<ol id="qunit-tests"></ol>

<script type="text/javascript">
test('String.prototype.toFormatString', function() {
	equal(typeof '1234'.toFormatString(2), 'string', 'return string');
	equal(typeof '1234'.toFormatString(5), 'string', 'return string');
	equal('1'.toFormatString(), '01', 'default place is 2');
	equal('1'.toFormatString(3), '001');
	equal('0'.toFormatString(), '00');
	equal('1.1'.toFormatString(), '01.1');
});

test('Number.prototype.toFormatString', function() {
	equal(typeof (1234).toFormatString(2), 'string', 'return string');
	equal(typeof (1234).toFormatString(5), 'string', 'return string');
	equal((1).toFormatString(), '01', 'default place is 2');
	equal((1).toFormatString(3), '001');
	equal((0).toFormatString(), '00');
	equal('1.1'.toFormatString(), '01.1');
});
</script>
</body>
</html>

## Number.prototype.toFormatString.js
Number.prototype.toFormatString = function(place) {
	return this.toString().toFormatString(place);
};

## String.prototype.toFormatString.js
String.prototype.toFormatString = function(place) {
	place = place || 2;
	var str = this.toString();
	var n = str.split('.')[0].length;
	while (n++ < place) str = '0'+str;
	return str;
};
	<!DOCTYPE html>
	<html>
	<head>
	<meta charset="utf-8"/>
	<title>toFormatString</title>
	<link rel="stylesheet" href="http://github.com/jquery/qunit/raw/master/qunit/qunit.css"/>
	<script src="http://github.com/jquery/qunit/raw/master/qunit/qunit.js"></script>
	<script src="http://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>
	<script src="Number.prototype.toFormatString.js"></script>
	</head>
	<body>
	<h1 id="qunit-header">toFormatString</h1>
	<h2 id="qunit-banner"></h2>
	<h2 id="qunit-userAgent"></h2>
	<ol id="qunit-tests"></ol>

	<script type="text/javascript">
	test('String.prototype.toFormatString', function() {
	equal(typeof '1234'.toFormatString(2), 'string', 'return string');
	equal(typeof '1234'.toFormatString(5), 'string', 'return string');
	equal('1'.toFormatString(), '01', 'default place is 2');
	equal('1'.toFormatString(3), '001');
	equal('0'.toFormatString(), '00');
	equal('1.1'.toFormatString(), '01.1');
	});

	test('Number.prototype.toFormatString', function() {
	equal(typeof (1234).toFormatString(2), 'string', 'return string');
	equal(typeof (1234).toFormatString(5), 'string', 'return string');
	equal((1).toFormatString(), '01', 'default place is 2');
	equal((1).toFormatString(3), '001');
	equal((0).toFormatString(), '00');
	equal('1.1'.toFormatString(), '01.1');
	});
	</script>
	</body>
	</html>
	Number.prototype.toFormatString = function(place) {
	return this.toString().toFormatString(place);
	};
	String.prototype.toFormatString = function(place) {
	place = place \|\| 2;
	var str = this.toString();
	var n = str.split('.')[0].length;
	while (n++ < place) str = '0'+str;
	return str;
	};