问题:

I'm testing something special and I'm trying to loop inside keyframes to dynamically write percentages into it.

I've tested something like that with SASS but it doesn't work.

@keyframes test{

    @for $i from 0 through 100 {
        #{$i}% {
            //do special stuff
        } 
        $i: $i + 1;
    }

I want it to output :

@keyframes test{
    0%{
          ...
    }
    1%{
          ...
    }
    2%{
          ...
    }
    3%{
          ...
    }
    ...
}

But I got

Error on line number: 23. Invalid CSS after "    #{$i}%": expected placeholder name, was " {"

I've tested this in LESS and it doesn't work either.

    @a: 0%;

    @keyframes test{

       .func (@a, @b, @c);

    }

    .func (@a, @b, @c) when (@a < 100%){  
        (@a){
            //do special stuff
        }

        .func (@a+1, @b, @c);
    }

Can someone help me ?

回答1:

It will work if you finagle it like this:

@keyframes test {
  @for $i from 0 through 100 {
    #{$i * 1%} {
      // do special stuff
    } 
  }
}

回答2:

LESS version

requires the .for mixin

https://github.com/pixelass/more-or-less/blob/master/less/fn/_for.less

NOTICE

This is a NON inline-js version for maximum compatibility

INPUT

@keyframes crazy {
    .for(0,100);.-each(@i){
        @selector: e('@{i}%');

        @{selector} {
            /* do crazy stuff */
        }
    }
}

OUTPUT

@keyframes crazy {
  0% {
    /* do crazy stuff */
  }
  1% {
    /* do crazy stuff */
  }
  2% {
    /* do crazy stuff */
  }
  3% {
    /* do crazy stuff */
  }
  4% {
    /* do crazy stuff */
  }
    ...etc
}