less运算

html {
  font-size: 50px;
}


//划分的份数为 15
@no: 15;

//320
@media screen and (min-width: 320px){
  html {
    font-size: 320px / @no;
  }
}

//360
@media screen and (min-width: 360px){
  html {
    font-size: 360px / @no;
  }
}

//375
@media screen and (min-width: 375px){
  html {
    font-size: 375px / @no;
  }
}

//384
@media screen and (min-width: 384px){
  html {
    font-size: 384px / @no;
  }
}

//400
@media screen and (min-width: 400px){
  html {
    font-size: 400px / @no;
  }
}

//414
@media screen and (min-width: 414px){
  html {
    font-size: 414px / @no;
  }
}

//424
@media screen and (min-width: 424px){
  html {
    font-size: 424px / @no;
  }
}

//480
@media screen and (min-width: 480px){
  html {
    font-size: 480px / @no;
  }
}

//540
@media screen and (min-width: 540px){
  html {
    font-size: 540px / @no;
  }
}

//720
@media screen and (min-width: 720px){
  html {
    font-size: 720px / @no;
  }
}

//750
@media screen and (min-width: 750px){
  html {
    font-size: 750px / @no;
  }
}