//邊框
@mixin yjbk ($num) {
    -moz-border-radius: $num;
    -webkit-border-radius: $num;
    border-radius: $num;
}

//轉(zhuǎn)塊元素
@mixin block ($width, $height) {
    width: $width;
    height: $height;
    display: block;
}

//轉(zhuǎn)行內(nèi)塊元素
@mixin inline-block ($width, $height) {
    width: $width;
    height: $height;
    display: inline-block;
}


//屏幕中居中
@mixin pm-center {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}


//文本省略
@mixin ellipsis($rowCount: 1) {
    @if $rowCount <=1 {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
} @else {
        min-width: 0;
        overflow: hidden;
        text-overflow: ellipsis;
        display: -webkit-box;
        -webkit-line-clamp: $rowCount;
        -webkit-box-orient: vertical;
    }
}

//三角形（）
@mixin sanjiaoxing($size: 5px, $color: rgba(0, 0, 0, 0.6), $dir: bottom) {
    width: 0;
    height: 0;
    border-style: solid;
    @if (bottom==$dir) {
        border-width: $size $size 0 $size;
        border-color: $color transparent transparent transparent;
    } @else if (top==$dir) {
        border-width: 0 $size $size $size;
        border-color: transparent transparent $color transparent;
    } @else if (right==$dir) {
        border-width: $size 0 $size $size;
        border-color: transparent transparent transparent $color;
    } @else if (left==$dir) {
        border-width: $size $size $size 0;
        border-color: transparent $color transparent transparent;
    }
}

//元素定位
@mixin postion ($type, $top, $right, $bottom, $left) {
    position: $type;
    top: $top;
    bottom: $bottom;
    left: $left;
    right: $right;
    & > #{$type} {
        color: #f00;
    }
}

// 隔行換色
@mixin ghhs($evenColor, $evenBgColor, $oddColor, $oddBgColor) {
    &:nth-child(2n) {
        color: $evenColor;
        background-color: $evenBgColor;
    }
    &:nth-child(2n + 1) {
        color: $oddColor;
        background-color: $oddBgColor;
    }
}

// 禁止文本被選擇
@mixin user-select {
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
}

//修改input placeholder顏色
@mixin placeholderColor($color: #fff) {
    &::-webkit-input-placeholder {
      color: $color;
    }
  
    &::-moz-placeholder {
      /* Mozilla Firefox 19+ */
      color: $color;
    }
  
    &:-moz-placeholder {
      /* Mozilla Firefox 4 to 18 */
      color: $color;
    }
  
    &:-ms-input-placeholder {
      /* Internet Explorer 10-11 */
      color: $color;
    }
  }

  //元素初始化
  @mixin elinit ($w: auto,$h: auto,$c: #fff) {
      width: $w;
      height: $h;
      background: $c;
  }
  
  //元素居中
  @mixin content ($w,$h) {
      position: absolute;
      width: $w;
      height: $h;
      top: 50%;
      left: 50%;
      margin-top: -$h / 2;
      margin-left:  -$w / 2;
  }

  //陰影
  @mixin boxshadow ($x) {
      box-shadow: $x;
  }

作者：王三歲805
鏈接：https://juejin.cn/post/7018003395713695780
來源：稀土掘金
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