media实现的rem为单位的响应式

@charset "UTF-8";

@mixin queryWidth($min, $max) {
 @if $min == -1 {
   @media screen and (max-width: $max+px) {
     html {
       font-size: ( ($max+1) / 375 ) * 100px;
     }
   }
 } @else if $max == -1 {
   @media screen and (min-width: $min+px) {
     html {
       font-size: ( $min / 375 ) * 100px;
     }
   }
 } @else {
   @media screen and (min-width: $min+px) and (max-width: $max+px) {
     html {
       font-size: ( $min / 375 ) * 100px;
     }
   }
 }
}

@include queryWidth(-1, 319);    // for iphone 4
@include queryWidth(320, 359);   // for iphone 5
@include queryWidth(360, 374);
@include queryWidth(375, 383);   // for iphone 6
@include queryWidth(384, 399);
@include queryWidth(400, 413);
@include queryWidth(414, -1);    // for iphone 6 plus