jquery链式操作的正确使用方法

$second.html(value);
$second.on('click',function(){
alert('hello everybody');
});
$second.fadeIn('slow');
$second.animate({height:'120px'},500);

$second.html(value);
$second.on('click',function(){
alert('hello everybody');
}).fadeIn('slow').animate({height:'120px'},500);