通过媒体查询设置在不同分辩率下字体的大小

@media only screen and (min-width:320px){
  body{font-size:11.5px!important}.viewport{max-width:320px}
}
@media only screen and (min-width:360px){
  body{font-size:12.5px!important}.viewport{max-width:360px}
}
@media only screen and (min-width:480px){
  body{font-size:16px!important}.viewport{max-width:480px}
}