在scss中除了可以定义变量，具有@extend和@mixins等特性之外，还自备了一系列的函数功能。
scss自出来之后，广受欢迎，如何能快速写出想要的css呢，可自定义一些scss方法，本人罗列了一些最近用到的scss函数，其实包括文本超出范围的格式化、弹性盒子居中、左浮动、右浮动、iPhone适配、细边框、图标、背景、伪类样式改变等

/显示多行，省略号 
@mixin ellipsis($row:1) {
    /* 显示两行，省略号 */
    text-overflow: -o-ellipsis-lastline;
    overflow: hidden;
    text-overflow: ellipsis;
    display: -webkit-box;
    -webkit-line-clamp: $row;
    line-clamp: $row;
    -webkit-box-orient: vertical;
}

//单行，省略号 
@mixin uniline {
	overflow: hidden;
	text-overflow:ellipsis;
	white-space: nowrap;
}

//flex样式
@mixin flex($msg: ()) {
    display: flex;
    @if ($msg) {
        @each $key,
        $value in $msg {
            @if ($key == "i") {
                @if ($value) {
                    align-items: $value;
                }
                @else{
                    align-items: center;
                }
            }
            @else if($key == "c") {
                @if ($value) {
                    justify-content: $value;
                }
                @else{
                    justify-content: center;
                }
            }
			@else if($key == "d") {
                @if ($value) {
                    flex-direction: $value;
                }
                @else{
                    flex-direction: column;
                }
			}
            @else if($key == "w") {
                @if ($value) {
                    flex-wrap:$value;
                }
                @else{
                    flex-wrap:wrap ;
                }
			}
        }
    }
}

//iPhone X、iPhone XR、iPhone XS Max、iPhone 11、iPhone 11 Pro、iPhone 11 Pro Max适配	
@mixin iphoneAdaptive ($name:'p',$n:''){
	@if($name == "p"){
		/* 可以通过增加padding-bottom来适配 */
		padding-bottom: calc(#{$n} +  constant(safe-area-inset-bottom)); /*兼容 IOS<11.2*/
		padding-bottom: calc(#{$n} +  env(safe-area-inset-bottom)); /*兼容 IOS>11.2*/
	}
	@else if($name == "m"){
		/* 可以通过margin-bottom来适配 */
		margin-bottom: calc(#{$n} +  constant(safe-area-inset-bottom));
		margin-bottom: calc(#{$n} +  env(safe-area-inset-bottom));
	}
	@else if($name == "h"){
		/* 或者改变高度*/
		height: calc(#{$n} +  constant(safe-area-inset-bottom));
		height: calc(#{$n} +  env(safe-area-inset-bottom));
	}
}

// 宽高
@mixin wh($w, $h: $w) {
    width: $w;
    height: $h;
    min-width: $w;
}

// 图片background: url()
@mixin bgUrl($name, $w, $h:$w) {
    width: $w;
    height: $h;
    background: url("@/static/"+$name) no-repeat;
    background-size: $w, $h;
}

// 老生常谈的 1px 问题
// 下边框
@mixin borderTopBot($borderColor, $type: bottom) {
    position: relative;
    &::before {
        content: '';
        display: block;
        position: absolute;
        left: 0;
        right: 0;

        @if ($type=="top") {
            top: 0;
        }

        @if ($type=="bottom") {
            bottom: 0;
        }

        width: 100%;

        @if ($type=="top") {
            border-top: 1px solid $borderColor;
        }

        @if ($type=="bottom") {
            border-bottom: 1px solid $borderColor;
        }

        transform: scaleY(0.5);
    }

	//图标样式
	@mixin iconStyle() {
	    @include pseudoClassContent;
	    background-repeat: no-repeat;
	    background-size: 100%;
	    background-position: center;
	}
	
	//伪类展示内容
	@mixin pseudoClassContent($text: "") {
	    content: $text;
	}