// 定义宽度，历遍2-1000
@for $i from 2 through 1000 {
  .w-#{$i} {
    width: $i + rpx;
  }
}

// 定义宽度百分比，遍历1-100
@for $i from 1 through 100 {
  .w-#{$i}p {
    width: $i * 1%;
  }
}

.w-none {
  width: auto !important;
}