如何防止移动铬的下拉到刷新

I want to prevent pull-down-to-refresh of mobile chrome(especially iOS chrome). My web application has vertical panning event with device-width and device-height viewport, but whenever panning down, mobile chrome refreshes itself because of browser's default function. Plus, on Safari browser, screen is rolling during panning event. I want to disable these moves.I want to prevent pull-down-to-refresh of mobil