jQuery – 如何动态地将列表项添加到无序列表？

看起来像一个简单的事情（尽管我仍在学习jQuery的细节）。

这是我的HTML：

 
 There were errors with your registration: 
 
  

这是我的（尝试过的）jQuery：

 // Check Required Fields. $('#fbsignup input.required').each(function () { if ($(this).val().trim() == '') { $(this).next('em').html('*').show(); $('#fbsignup .message ul').add('li').html('Fields marked with * are required.'); } }); 

这就是它对DOM做的事情：

 
 There were errors with your registration: 
Fields marked with * are required.
  

它将文本添加到内部html。 我希望它添加一个

 
 There were errors with your registration: 
 
Fields marked with * are required.
 
  

 $('#fbsignup .message ul').add('
Fields marked with * are required.
'); 

").appendTo("#fbsignup .message ul").html("Fields marked with * are required.");​

试试吧。