1. remove/re-add all original CSS class

implement: save original class to $.data on elements

Case:

el: <span class="a b" />

step#1:$(el).toggleClass();

-save "a b" to $.data(this,"originalClass"), then remove "a b" class

on this element.

step#2:$(el).toggleClass();

-restore $.data(this,"originalClass")(if exists) to this element.

And with boolean:

step#1:$(el).toggleClass(false);

-save "a b" to $.data(this,"originalClass"), then remove "a b" class

on this element.

step#1:$(el).toggleClass(true);

-restore $.data(this,"originalClass")(if exists) to this element.

2.handle multi-class without boolean.

use .toggleClass("c b") instead of .toggleClass("c").toggleClass("b")

implement: split className string before pass it to $.className[add/

remove], and handle each one separately

Case:

el: <span class="a b" />

step#1:$(el).toggleClass("b c");

-remove class "b" and add class "c" on this element.

step#2:$(el).toggleClass("b c");

-remove class "c" and add class "b" on this element.