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使用less循环遍历制作栅格系统

* {
  padding: 0;
  margin: 0;
}

@grid-columns: 12;

.calc-grid-column(@index, @class, @type) when (@type = width) and (@index > 0) {
  .col-@{class}-@{index} {
    width: percentage((@index / @grid-columns));
  }
}
.calc-grid-column(@index, @class, @type) when (@type = push) and (@index > 0) {
  .col-@{class}-push-@{index} {
    left: percentage((@index / @grid-columns));
  }
}
.calc-grid-column(@index, @class, @type) when (@type = push) and (@index = 0) {
  .col-@{class}-push-0 {
    left: auto;
  }
}
.calc-grid-column(@index, @class, @type) when (@type = pull) and (@index > 0) {
  .col-@{class}-pull-@{index} {
    right: percentage((@index / @grid-columns));
  }
}
.calc-grid-column(@index, @class, @type) when (@type = pull) and (@index = 0) {
  .col-@{class}-pull-0 {
    right: auto;
  }
}
.calc-grid-column(@index, @class, @type) when (@type = offset) {
  .col-@{class}-offset-@{index} {
    margin-left: percentage((@index / @grid-columns));
  }
}

// Basic looping in LESS
.loop-grid-columns(@index, @class, @type) when (@index >= 0) {
  .calc-grid-column(@index, @class, @type);
  // next iteration
  .loop-grid-columns((@index - 1), @class, @type);
}

// Create grid for specific class
.make-grid(@class) {
  .loop-grid-columns(@grid-columns, @class, width);
  .loop-grid-columns(@grid-columns, @class, pull);
  .loop-grid-columns(@grid-columns, @class, push);
  .loop-grid-columns(@grid-columns, @class, offset);
}


.make-grid(xs);

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