I don’t know why, but this is how it happens.
When I make a jQuery plugin, the skeleton is
(function($) { $.fn.myplugin = function() { return this; }; })(jQuery);
And if I need an each operation inside plugin, the skeleton can be
(function($) { $.fn.myplugin = function() { //outside each, this.width() can work return this.each(function() { //inside each, only $(this).width() works }); }; })(jQuery);
The interesting thing is inside each, I must use “$(this)” to run jQuery functions, but outside each, I can also use “this”.
I don’t know why now, but I think I will know some day.