/**
 * @method 清除浮动 %clearfix 
 * @description 清除浮动
 * @example 调用
 * 
 * ```scss
 * div {
 *    @ extend %clearfix;
 * }
 * ```
 * 
 * ```css
 * 	div {
	    *zoom: 1;
	}
	div:after {
	    display: block;
	    clear: both;

	    height: 0;

	    content: '\20';
	}
 * ```
 */

%clearfix {
    *zoom: 1;
    @at-root &:after {
        display: block;
        clear: both; 

        height: 0;

        content: '\20';
    }
}