add some comments
add some comments

peunzhang/iSlider,xieyu33333/iSlider,qbaty/iSlider,jasonshaw/iSlider,guo-chuang/iSlider,BE-FE/iSlider,shinate/iSlider,954053260/iSlider,kendoctor/iSlider,yangfeiloveG/iSlider,shinate/iSlider,eric-seekas/iSlider,kendoctor/iSlider,bensonzhow/iSlider,metal88888/iSlider,bensonzhow/iSlider,yangfeiloveG/iSlider,zimzhang/iSlider,liuxuewei/iSlider,zimzhang/iSlider,eric-seekas/iSlider,guo-chuang/iSlider,jasonshaw/iSlider,xieyu33333/iSlider,BE-FE/iSlider,954053260/iSlider,metal88888/iSlider