when some other js code override attr function, it may be always send arguments more the one, then code's behind:

return jQuery.access( this, jQuery.attr, name, value, arguments.length > 1 );

will go not correctly,

i view this problem when i use tinymce fulltext components

and when i use like $("a").attr("class"), it will be deal as chainable.

the other auguments will be undefined.

it has no problem in jquery version 1.6.2.

i don't know if it should let other changing their code or change the jquery core.