scroll bug fix
scroll bug fix

TotooriaHyperion/better-scroll,ustbhuangyi/better-scroll,ustbhuangyi/better-scroll,TotooriaHyperion/better-scroll,TotooriaHyperion/better-scroll,ustbhuangyi/better-scroll,neurotoxinvx/better-scroll,ustbhuangyi/better-scroll,neurotoxinvx/better-scroll,neurotoxinvx/better-scroll