https://learn.jquery.com/about-jquery/
编写plugin时,常用的两个重要pai
https://api.jquery.com/jQuery.extend/
https://api.jquery.com/jQuery.fn.extend/
https://learn.jquery.com/about-jquery/
编写plugin时,常用的两个重要pai
https://api.jquery.com/jQuery.extend/
https://api.jquery.com/jQuery.fn.extend/