fixed warning
fixed warning

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