解决办法设置viewpoint
<meta name="viewport" content="width=device-width, target-densitydpi=medium-dpi, initial-scale=1, user-scalable=no"/>
viewport设置参考：
content=”height = [pixel_value | device-height] ,width = [pixel_value | device-width ] ,initial-scale = float_value ,minimum-scale = float_value ,maximum-scale = float_value ,user-scalable = [yes | no] ,target-densitydpi = [dpi_value | device-dpi |high-dpi | medium-dpi | low-dpi]“