WordPress/wp-admin/js/about.js

(function($){
	var password = 'Gosh, WordPress is grand.',
		$input = $('#pass'),
		shouldAnimate = true,
		timesForAnimation = [280, 300, 305, 310, 315, 325, 330, 345, 360, 370, 380, 400, 450, 500, 600],
		resultsCache = {},
		indicatorString = $('#pass-strength-result').text();

	function updateResult(){
		var strength;

		if ( typeof( resultsCache[ $input.val() ]) === 'undefined') {
			strength = wp.passwordStrength.meter($input.val(), [], $input.val());
			resultsCache[ $input.val() ] = strength;
		} else {
			strength = resultsCache[ $input.val() ];
		}

		$('#pass-strength-result').removeClass('short bad good strong');
		switch ( strength ) {
			case 2:
				$('#pass-strength-result').addClass('bad').html( pwsL10n['bad'] );
				break;
			case 3:
				$('#pass-strength-result').addClass('good').html( pwsL10n['good'] );
				break;
			case 4:
				$('#pass-strength-result').addClass('strong').html( pwsL10n['strong'] );
				break;
			default:
				$('#pass-strength-result').addClass('short').html( pwsL10n['short'] );
		}
	}
	function resetMeter(){
		$input.val('');
		$('#pass-strength-result').text(indicatorString);
		$('#pass-strength-result').removeClass('short bad good strong');
	}

	function animate(){
		if (shouldAnimate === false)
			return;
		if ($input.val().length < password.length){
			$input.val( password.substr(0, $input.val().length + 1) );
			updateResult();

			// Look like real typing by changing the speed new letters are added each time
			setTimeout( animate, ( timesForAnimation[ Math.floor( Math.random() * timesForAnimation.length ) ] ) );
		} else {
			resetMeter();

			// When we reset, let's wait a bit longer than normal to start again
			setTimeout(animate, 700);
		}

	}

	function begin(){
		// we async load zxcvbn, so we need to make sure it's loaded before starting
		if (typeof(zxcvbn) !== 'undefined')
			animate();
		else
			setTimeout(begin,800);
	}

	// Turn off the animation on focus
	$input.on('focus', function(){
		shouldAnimate = false;
		resetMeter();
	});

	// Act like a normal password strength meter
	$input.on('keyup', function(){
		updateResult();
	});

	// Start the animation
	begin();

})(jQuery);