原来的效果


加了之后
<meta name="viewport" content="width=device-width,initial-scale=1.0,user-scalable=no,target-densitydpi=device-dpi" />



可以达到效果！

viewport 语法介绍：
<meta name="viewport"
      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]