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<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>本教程(w3big.com)</title> <script src="http://cdn.static.w3big.com/libs/jquery/1.6.2/jquery.min.js"></script> </head> <body> <script> (function(){ var sub = jQuery.sub(); sub.fn.myCustomMethod = function(){ return 'just for me'; }; sub(document).ready(function() { alert(sub('body').myCustomMethod()); }); alert(typeof jQuery('body').myCustomMethod); //underfine })(); </script> </body> </html>