gistfile1.js

$(document).ready(function() {
	$('#new-to-do-item').keyup(function(e) {
		if (e.which === 13) {
			var text = $(this).val();
			var listItem = "<li><input type='checkbox'>" + text + "</li>"
			$('ul').append(listItem);
		}
	});
	$('input[type="checkbox"]').click(function() {
		console.log(this);
		console.log($(this));
		if (this.checked) {
		// or you could do if ($(this).is(":checked")) {
			$(this).parent().css("background-color", "#e8e8e8");
		} else {
			$(this).parent().css("background-color", "#ffffff");
		}
	});
});