21-解决方案
4.5.2 解决方案
(function($) {
$(document).ready(function() {
var horseBreeds = ['Quarter Horse', 'Thoroughbred', 'Arabian'];
var draftBreeds = ['Belgian', 'Percheron'];
var breeds = $.merge( horseBreeds, draftBreeds );
$('#horses').html( '<li>' + breeds.join('</li><li>') + '</li>' );
});
})(jQuery);