图片按比例设置

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图片按比例设置:

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mixin img-fit() {
  object-fit: cover;
  object-position: 50% 50%;
  // font-family: 'object-fit: cover; object-position: 50% 50%';
  width: 100%;
  height: 100%;
}

%img-fit {
  @include img-fit();
}

.responsive-media {
  display: block;
  overflow: hidden;
  padding: 0;
  position: relative;
  background: transparent;
  z-index: 1;
  img,
  picture,
  iframe,
  embed,
  object,
  video {
    @extend %img-fit;
    position: absolute;
    top: 0;
    left: 0;
    z-index: 1;
  }
}

@mixin responsive-ratio($x,$y) {
  height: 0;
  padding-bottom: percentage($y / $x);
}
.responsive-media{
@include responsive-ratio(2, 3);//图片２：3
}

如果知道一张图片的宽高比，图片大小随屏幕缩放:

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图片父元素用padding-bottom撑开高度，然后图片可以height 100%, 再用上object-fit: cover;

.parent {
  position: relative;  
  margin: 0 auto;
  padding-bottom: 60%;
}

.parent img{
  position: absolute;
  height: 100%;
  width: 100%;
  object-fit: cover;
}