1. 

2.less 文件分布

/*! * Bootstrap v3.3.7 (http://getbootstrap.com) * Copyright 2011-2016 Twitter, Inc. * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE) */// Core variables and mixins // 引入变量和mixin函数@import "variables.less";       //Bootstrap变量@import "mixins.less";          //引入Bootstrap mixin工具函数// Reset and dependencies   // 重置元素样式和依赖关系@import "normalize.less";       //重置元素样式,统一浏览器显示@import "print.less";           //设置打印样式@import "glyphicons.less";      //icon图标// Core CSS// CSS全局样式@import "scaffolding.less";     //重置元素样式,统一/增添Bootstrap样式。（盒模型宽度、字体大小、a鼠标样式、图片、sr-only和button）@import "type.less";            //排版@import "code.less";            //代码@import "grid.less";            //定义栅格系统样式 (.container,.row和各.col-*-*)@import "tables.less";          //表格   @import "forms.less";           //表单@import "buttons.less";         //定义按钮基本样式// Components// 组件@import "component-animations.less";@import "dropdowns.less";               //下拉按钮@import "button-groups.less";           //按钮组@import "input-groups.less";            //表单元素样式@import "navs.less";                    //导航样式@import "navbar.less";                  //导航条样式@import "breadcrumbs.less";             //眉毛链接@import "pagination.less";              //分页导航@import "pager.less";                   //翻页   (上一页、下一页 .pager,.next,.previous,.disabled)@import "labels.less";                  //标签@import "badges.less";                  //徽章@import "jumbotron.less";               //巨幕@import "thumbnails.less";              //缩略图@import "alerts.less";                  //警告框@import "progress-bars.less";           //进度条@import "media.less";                   //媒体对象@import "list-group.less";              //列表组@import "panels.less";                  //面板@import "responsive-embed.less";        //具有响应式特性的嵌入内容@import "wells.less";                   //把 Well 用在元素上，就能有嵌入（inset）的简单效果。@import "close.less";// Components w/ JavaScript// JS插件@import "modals.less";                  //对话框样式@import "tooltip.less";                 //工具提示@import "popovers.less";                //弹出框@import "carousel.less";                //轮播// Utility classes// 实用工具类@import "utilities.less";               //设置浮动,显示/隐藏,固定定位@import "responsive-utilities.less";    //设置栅格系统中各列显示/隐藏,打印样式(col-*-*)

3.相关链接

4. 扩展：常用 less 代码

4.1 文件导入前缀

@import (reference) "main.less";  //引用LESS文件，但是不输出，不会编译出来@import (inline) "main.less";  //引用LESS文件，但是不进行操作@import (once) "main.less";  //引用LESS文件，但是不进行操作@import (less) "index.css";  //无论是什么格式的文件，都把他作为LESS文件操作@import (css) "main.less";  //无论是什么格式的文件，都把他作为CSS文件操作

4.2 动画

.transition(@property:all,@duration:1s,@timing-function:linear,@delay:0s){
         //transition:@property @duration @timing-function @delay;     transition:@arguments;     -webkit-transition:@arguments;     -moz-transition:@arguments;     -ms-transition:@arguments;     -o-transition:@arguments;  }    .wrap{
        .transition(@duration:2s);    &:hover{        width:200px;    }}

4.3 普通盒子  宽 高 背景色

/*------不加括号即是普通样式类，也是封装的一个函数，编译的时候，也会跟着编译加;括号仅仅是封装的函数，编译的时候不是编译函数-------*/.pub(){
     //-->不加括号会被编译出来，加了不会被编译出来    width: 100px;    height: 100px;    background: green;}.box2{
        .pub(); //--->也可以 .pub;    background: red;}

4.4 1px 边框

.border-1px(@color:#e5e5e5){
        position: relative;    &:after{        display: block;        position: absolute;        left: 0;        bottom: 0;        width: 100%;        border-top:1px solid @color;        content: '';    }}.box2{
        width:100px;    height:100px;    .border-1px;}

4.5 作为URL的变量

//作为URL的变量@imgurl:"https://www.baidu.com/img/";//引用.box2{
        width:100px;    height:100px;    background: url("@{imgurl}bdlogo.png");}

4.6  //字体设置

@font_size: 14px; //默认字体大小.font_s(@fs:@font_size){
    font-size: @fs;}@font_family: "microsoft yahei"; //默认字体颜色.font_style(@fc: #333, @fs: @font_size, @ff: @font_family) {
    color: @fc;font-size: @fs;font-family: @ff;}

4.7 三角形

//三角样式---①.triangle-less(top, @w:50px, @c:#ccc) {
        border-color:  transparent transparent @c transparent;}.triangle-less(bottom, @w:50px, @c:#ccc) {
        border-color:  @c transparent transparent transparent;}.triangle-less(left, @w:50px, @c:#ccc) {
        border-color:  transparent @c transparent transparent;}.triangle-less(right, @w:50px, @c:#ccc) {
        border-color:  transparent transparent transparent @c;}//@_ 匹配所有.triangle-less(@_, @w:50px, @c:#ccc) {
    //传参保存一致，所以@w:50px和@c:#ccc也必须写上    width: 0;    height: 0;    border-width: @w;    border-style: solid;} //引用.box{
      .triangle-less(top, 100px, green); }

4.8 渐变

//渐变.jh2(@color1,@color2,@dd:180deg){
            background: -webkit-linear-gradient(@dd,@color1,@color2);        background: -moz-linear-gradient(@dd,@color1,@color2);        background: -ms-linear-gradient(@dd,@color1,@color2);        background: -o-linear-gradient(@dd,@color1,@color2);        background: linear-gradient(@dd,@color1,@color2);    }    .box2{
                width:100px;        height:100px;        .jh2(red,pink);    }

4.9 圆角

//圆角.border_radius(@radius:5px){
          -wekit-border-radius: @radius;      -max-border-radius: @radius;      border-radius: @radius;  } .box2{
        .border;    .border_radius;    width:200px;    height:200px;}

4.10 溢出截断-

.subText() {

text-overflow: ellipsis;

white-space: nowrap;

overflow: hidden;

}

4.11 flex 垂直居中

.flex(){
        display: -webkit-box;     display: -moz-box;     display:-webkit-flex;    display: -ms-flexbox;    display:flex;}.flex-auto{
        .flex();    -webkit-justify-content: center;    -moz-justify-content: center;    -ms-justify-content: center;    justify-content: center;    -webkit-align-items: center;    -moz-align-items: center;    -ms-align-items: center;    align-items: center;}

4.12 1px

/*1像素*/.borderLine(@color:#dcdcdc,@top:auto,@right:auto,@bottom:0,@left:0){
        position: relative;    &::after{        content: '';        position: absolute;        left: @left;        bottom: @bottom;        right: @right;        top: @top;        height: 1px;        width: 100%;        background-color: @color;        display: block;        z-index: 15;        -webkit-transform-origin: 50% 100%;        transform-origin: 50% 100%;    }}.border-b{
        .borderLine(@color:#dcdcdd,@top:auto,@right:auto,@bottom:0,@left:0)} @media only screen and (-webkit-min-device-pixel-ratio: 2) {
        .border-b:after {        -webkit-transform: scaleY(0.5);        transform: scaleY(0.5);    }}@media only screen and (-webkit-min-device-pixel-ratio: 3) {
        .border-b::after {        -webkit-transform: scaleY(0.33);        transform: scaleY(0.33);    }}

5.其他扩展

5.1 其他常用组件 less

/*** 作品：mixin.less* 更新：2017年12月14日* 简介：1. 一个基于 Less 的样式工具库，封装了常用 mixin，帮助您更轻松地书写 Less 代码。*       2. 只在调用时才输出代码，减少代码冗余，避免样式污染*       3. 不自带兼容前缀，减少代码量，而建议采用工具生成，如 postcss、Autoprefixer、less-plugin-autoprefix 等*       4. 附带 IE 各类 Hack*//*-------------------------------------├   布局                              ┆└------------------------------------*/// 盒子宽高.size(@w, @h) {
     width: @w; height: @h; }// 最小尺寸, 兼容IE6.min-width(@min-w) {
     min-width: @min-w; _width: @min-w; }.min-height(@min-h) {
     min-height: @min-h; _height: @min-h; }// 内联块级元素, 兼容IE6.dib() {
     display: inline-block; *display: inline; *zoom: 1; }// 固定定位, 兼容IE6.fixed() {
     position: fixed; _position: absolute; *zoom: 1; }// 统一盒模型.border-box() {
      *, *:after, *:before { -webkit-box-sizing: border-box; -moz-box-sizing: border-box; box-sizing: border-box; }}// 文字图片居中.center(text-x) {
     text-align: center; }.center(text-y) {
     display: table-cell; vertical-align: middle; }// 块级元素水平居中.center(auto-x) {
     display: block; margin-left: auto; margin-right: auto; }// 居中, 不确定尺寸, 不兼容 IE6.center(unknown) {
     position: absolute; top: 0; left: 0; right: 0; bottom: 0; margin: auto; }.center(unknown-x) {
     position: absolute; left: 0; right: 0; margin-left: auto; margin-right: auto; }.center(unknown-y) {
     position: absolute; top: 0; bottom: 0; margin-top: auto; margin-bottom: auto; }// 居中, 确定尺寸, 兼容 IE6.center(known, @w, @h) {
      .size(@w, @h);  position: absolute; top: 50%; left: 50%; margin-top: -(@w / 2); margin-left: -(@h / 2);}.center(known-x, @w) {
      width: @w;  position: absolute; left: 50%; margin-left: -(@h / 2);}.center(known-y, @h) {
      height: @h;  position: absolute; top: 50%; margin-top: -(@w / 2);}// 居中, CSS3 平移方式, 兼容性不行.center(translate) {
     position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%); }// 居中, Flex 方式, 兼容性不行.center(flex) {
     display: flex; align-items: center; justify-content: center; }// 多个子项布局.list(float, @w: 25%) {
     float: left; width: @w; }.list(inline, @w: 25%) {
     .dib(); width: @w; }.list(flex) {
     flex: 1; }// 遮罩层, 全屏遮罩、区域遮罩.over-screen(fixed) {
     .fixed(); top: 0; left: 0; right: 0; bottom: 0; }.over-screen(absolute) {
     position: absolute; top: 0; left: 0; right: 0; bottom: 0; }// 容器宽高比固定// 100* 1/1 = 100%// 100* 3/4 = 75%.fixed-ratio(@padding-top: 100%) {
      position: relative; width: 100%; height: 0; padding-top: @padding-top;  img { position: absolute; top: 0; left: 0; width: 100%; height: 100%; }}// 扩展点击区域.extend-click() {
      position: relative;  &:before { content: ''; position: absolute; top: -10px; left: -10px; right: -10px; bottom: -10px; }}// 定宽居中页面布局.layout-page(@width: 1200px) {
     width: @width; margin-left: auto; margin-right: auto; }// 侧边栏// 主要区域：overflow: hidden; margin-left: xx; margin-right: xx;.sidebar(left, @width) {
     position: absolute; top: 0; left: 0; width: @width; }.sidebar(right, @width) {
     position: absolute; top: 0; right: 0; width: @width; }/*-------------------------------------├   字体                              ┆└------------------------------------*/// 字体大小.fz(@fz) {
     font-size: @fz; }// 字体大小与行高.fz(@fz, @lh) {
     font-size: @fz; line-height: @lh; }// 字体大小、行高、高度.fz(@fz, @h, @lh: @h) {
     font-size: @fz; height: @h; line-height: @lh; }// 行高与高度.lh(@h, @lh: @h) {
     height: @h; line-height: @lh; }// 字体颜色, 包括链接与非链接.color(@color) {
     color: @color;}// 字体颜色 + 自身 Hover.color(@color, @hovercolor) {
      color: @color;  &:hover { color: @hovercolor; }}// 字体颜色 + 链接 Hover.color(@color, @acolor, @hovercolor) {
      color: @color;  a {    color: @acolor;    &:hover { color: @hovercolor; }  }}// 正常字体样式.normal-font() {
     font-weight: normal; font-style: normal; }// 辅助性文字（灰色）.assist-font(@color: #b0b0b0, @fz: 14px) {
     color: @color; font-size: @fz; }// 禁止换行, 文本溢出省略号显示 (一行).ellipsis() {
      white-space: normal; word-wrap: break-word; word-break: break-all;  -o-text-overflow: ellipsis; -ms-text-overflow: ellipsis; text-overflow:ellipsis; overflow:hidden;}// 文本溢出省略号显示 (多行)// 只支持 webkit 浏览器, 解决方案：高度 = 行高*行数// height: 90px; line-height: 30px; -webkit-line-clamp: 3;.ellipsis-mult(@n: 3) {
      display: -webkit-box; -webkit-box-orient: vertical;-webkit-line-clamp: @n; word-break: break-all;  -o-text-overflow: ellipsis; -ms-text-overflow: ellipsis; text-overflow:ellipsis; overflow: hidden;}// 书写模式：牌匾从右至左水平单行排版效果、文笺从右至左、从上至下排版效果.retext(x) {
     direction: rtl; unicode-bidi: bidi-override; }.retext(y) {
     writing-mode: tb-rl; writing-mode: vertical-rl; }// 文字透明.transparent-text() {
     font: 0/0 serif; text-shadow: none; color: transparent; }// 文字隐藏（常用于SEO优化）// 
xx.hidden-text() {
     text-indent : -9999px; overflow: hidden; text-align: left; }// 文字外发光效果.glow-text(@r: 10px, @color: gold) {
     text-shadow: 0 0 @r @color; }/*-------------------------------------├   图像                              ┆└------------------------------------*/// 用 max-width 来防止图片撑破容器.max-img() {
     display: block; max-width: 100%; height: auto; }// 2x 3x 背景图片.bg-image(@url) {
      background-image: url("@url + '@2x.png'");  @media (-webkit-min-device-pixel-ratio: 3), (min-device-pixel-ratio: 3) {    background-image: url("@url + '@3x.png'");  }}// 全屏大图背景.fullscreen-bg(@url) {
      width: 100vw;  height: 100vh;  background: url(@url) no-repeat 50% 50%;  background-size: cover;}// 滤镜: 将彩色照片显示为黑白照片.grayscale() {
      filter: grayscale(100%);  -webkit-filter: grayscale(100%);  -moz-filter: grayscale(100%);  -ms-filter: grayscale(100%);  -o-filter: grayscale(100%);}/*-------------------------------------├   动效                              ┆└------------------------------------*/// 链接默认无下划线，hover后有下划线的样式.hover-link() {
      text-decoration: none;  &:hover { text-decoration: underline; }}// 将链接变成默认的文字样式.unstyled-link() {
      color: inherit;  cursor: inherit;  text-decoration: inherit;  &:active, &:focus { outline: none; }}// 盒子阴影// box-shadow: 水平阴影的位置, 垂直阴影的位置, 模糊距离, 阴影的大小, 阴影的颜色, 阴影开始方向（默认是从里往外，设置inset就是从外往里）;// box-shadow: h-shadow v-shadow blur spread color inset;.box-shadow() {
      box-shadow: 0px 14px 26px 0px rgba(0, 0, 0, 0.1);}// 盒子 Hover.box-hover() {
      // box-shadow: 0px 1px 2px 0px rgba(84, 107, 107, .4);  transition: all .2s linear;  &:hover {    box-shadow: 0 15px 30px rgba(0, 0, 0, .1);    transform: translate3d(0, -2px, 0);  }}.box-hover2() {
      transition: transform .5s ease;  &:hover {    transform: translateX(10px);  }}// 三维闪动 bug 处理.transform-fix() {
     -webkit-backface-visibility: hidden; -webkit-transform-style: preserve-3d; }// Animation.ani(@name, @time: 1s, @ease: ease-in-out, @fillmode: forwards) {
      animation-name: @name;  animation-duration: @time;  animation-timing-function: @ease;  animation-fill-mode: @fillmode;}/*-------------------------------------├   功能                              ┆└------------------------------------*/// 浮动, 兼容 IE6.fl() {
     float: left; *display: inline; _display:inline; }.fr() {
     float: right; *display: inline; _display:inline; }// 清除浮动.clearfix() {
      *zoom: 1;  &:after { display: block; clear: both; content: ''; visibility: hidden; height: 0; }}.clearfix(table) {
      *zoom: 1;  &:before, &:after { content: " "; display: table; clear: both; }}// 禁止文本被选择.user-select() {
     -webkit-user-select: none; -moz-user-select: none; -ms-user-select: none; user-select: none; }// 隐藏鼠标手势.hide-cursor() {
     cursor: none !important; }// 鼠标禁用样式，但仍然可以触发事件// .disabled() {
     cursor: not-allowed; }// 禁用元素事件// 1. 阻止任何点击动作的执行// 2. 使链接显示为默认光标(cursor:default)// 3. 阻止触发hover和active状态// 4. 阻止JavaScript点击事件的触发.pointer-events() {
     pointer-events: none; }// 模糊.blur(@blur: 10px) {
      filter: blur(@blur);  -webkit-filter: blur(@blur);  -moz-filter: blur(@blur);  -o-filter: blur(@blur);  -ms-filter: blur(@blur);  filter: progid:DXImageTransform.Microsoft.Blur(PixelRadius='@{blur}');  *zoom: 1;}// 透明度, 兼容 IE8.opacity(@opacity: 20) {
     opacity: @opacity / 100; filter: alpha(opacity=@opacity); }// 用伪类来显示打印时 a 标签的链接.print-link() {
      @media print {    a[href]:after { content: " (" attr(href) ") "; }  }}// 隔行换色.zebra-lists(odd, @color) {
      &.odd {    >li:nth-child(odd) { background-color: @color; }  }}.zebra-lists(even, @color) {
      &.even {    >li:nth-child(even) { background: green; }  }}// 首字下沉.first-letter(@font-size: 6em) {
      &::first-letter{    float: left;    line-height: 1;    font-size: @font-size;  }}// 特殊标记段落第一行.first-line() {
      &::first-line{    color: red  }}// 美化选中文本.beauty-select() {
      &::selection{   color: #fff;   background-color: #6bc30d;   text-shadow: none;  }}// 美化占位符 placeholder 样式.beauty-placeholder(@fz, @color: #999, @align: left) {
      &:-moz-placeholder { font-size: @fz; color: @color; text-align: @align; }  &:-ms-input-placeholder {
     font-size: @fz; color: @color; text-align: @align; }  &::-webkit-input-placeholder {
     font-size: @fz; color: @color; text-align: @align; }}// 美化占位符 placeholder 样式（自定义属性和值）.beauty-placeholder(custom, @property, @value) {
      &:-moz-placeholder { @{property}: @value; }  &:-ms-input-placeholder {
     @{property}: @value; }  &::-webkit-input-placeholder {
     @{property}: @value; }}/*-------------------------------------├   图形                              ┆└------------------------------------*/// 三角形.triangle(@width: 4px,@color: #000) {
      display: inline-block;  width: 0;  height: 0;  vertical-align: middle;  border-top: @width solid @color;  border-left: @width solid transparent;  border-right: @width solid transparent;}// 三角形箭头气泡效果, IE6-7 无表现.arrow(top, @w: 10px, @color, @x: 50%) {
      position: relative;  &:before { position: absolute; bottom: 100%; left: @x; content: " "; height: 0; width: 0; pointer-events: none; border-style: solid; border-color: transparent; border-bottom-color: @color; border-width: unit(@w, px); @margin: -@w; margin-left: unit(@margin, px); }}.arrow(right, @w: 10px, @color, @y: 50%) {
      position: relative;  &:before { position: absolute; left: 100%; top: @y; content: " "; height: 0; width: 0; pointer-events: none; border-style: solid; border-color: transparent; border-left-color: @color; border-width: unit(@w, px); @margin: -@w; margin-top: unit(@margin, px); }}.arrow(bottom, @w: 10px, @color, @x: 50%) {
      position: relative;  &:before { position: absolute; top: 100%; left: @x; content: " "; height: 0; width: 0; pointer-events: none; border-style: solid; border-color: transparent; border-top-color: @color; border-width: unit(@w, px); @margin: -@w; margin-left: unit(@margin, px); }}.arrow(left, @w: 10px, @color, @y: 50%) {
      position: relative;  &:before { position: absolute; right: 100%; top: @y; content: " "; height: 0; width: 0; pointer-events: none; border-style: solid; border-color: transparent; border-right-color: @color; border-width: unit(@w, px); @margin: -@w; margin-top: unit(@margin, px); }}// 三角形箭头气泡效果, 带边框.arrow-with-border(top, @w: 10px, @color, @border-w: 1px, @border-color, @x: 50%) {
      position: relative;  &:before, &:after { bottom: 100%; left: @x; content: " "; height: 0; width: 0; position: absolute; pointer-events: none; border-style: solid; border-color: transparent; }  &:after {
     border-bottom-color: @color; border-width: unit(@w, px); @margin: -@w; margin-left: unit(@margin, px); }  &:before {
     border-bottom-color: @border-color; @arrbo: @w+@border-w; border-width: unit(@arrbo, px); @margin-bo: -@arrbo; margin-left: unit(@margin-bo, px); }}.arrow-with-border(bottom, @w: 10px, @color, @border-w: 1px, @border-color, @x: 50%) {
      position: relative;  &:before, &:after { top: 100%; left: @x; content: " "; height: 0; width: 0; position: absolute; pointer-events: none; border-style: solid; border-color: transparent; }  &:after {
     border-top-color: @color; border-width: unit(@w, px); @margin: -@w; margin-left: unit(@margin, px); }  &:before {
     border-top-color: @border-color; @arrbo: @w+@border-w; border-width: unit(@arrbo, px); @margin-bo: -@arrbo; margin-left: unit(@margin-bo, px); }}.arrow-with-border(left, @w: 10px, @color, @border-w: 1px, @border-color, @y: 50%) {
      position: relative;  &:before, &:after { top: @y; right: 100%; content: " "; height: 0; width: 0; position: absolute; pointer-events: none; border-style: solid; border-color: transparent; }  &:after {
     border-right-color: @color; border-width: unit(@w, px); @margin: -@w; margin-top: unit(@margin, px); }  &:before {
     border-right-color: @border-color; @arrbo: @w+@border-w; border-width: unit(@arrbo, px); @margin-bo: -@arrbo; margin-top: unit(@margin-bo, px); }}.arrow-with-border(right, @w: 10px, @color, @border-w: 1px, @border-color, @y: 50%) {
      position: relative;  &:before, &:after { top: @y; left: 100%; content: " "; height: 0; width: 0; position: absolute; pointer-events: none; border-style: solid; border-color: transparent; }  &:after {
     border-left-color: @color; border-width: unit(@w, px); @margin: -@w; margin-top: unit(@margin, px); }  &:before {
     border-left-color: @border-color; @arrbo: @w+@border-w; border-width: unit(@arrbo, px); @margin-bo: -@arrbo; margin-top: unit(@margin-bo, px); }}/*-------------------------------------├   组件                              ┆└------------------------------------*/// 吸顶导航.fix-header(@h: 70px) {
      .fixed();  top: 0;  left: 0;  width: 100%;  height: @h;  z-index: 1000;  // background-color: rgba(256, 256, 256, .92);  // border-bottom: 1px solid rgba(7, 17, 27, 0.1);  // box-shadow: 0px 0px 20px rgba(0,0,0,0.2);}// 吸底导航.fix-header(@h: 70px) {
      .fixed();  left: 0;  bottom: 0;  width: 100%;  height: @h;  z-index: 1000;}// 输入框.input-text() {
      display: block;  width: 100%;  padding: 4px 8px;  font-size: 14px;  line-height: 1.42858;  color: #333;  border: 1px solid #ddd;  background-color: #fff;  border-radius: 3px;}// 分割线// |/-.separator() {
      margin: 0 10px;  color: #999;  font-size: 14px;}// 分割线 / (面包屑导航).separator2() {
      &:before {    padding: 0 5px;    color: #ccc;    content: "/\00a0";  }}// 
      
// 支付宝：我也是有底线的.hr() {
      height: 1px;  margin: 10px 0;  border: 0;  clear: both;  background-color: #e2e2e2;}// 改装的 fieldset// 
      
       
返璞归真
      
.fieldset() {
      border-color: #d2d2d2;  border-width: 1px 0 0;  border-style: solid;  legend {    padding: 0 20px;    text-align: center;    font-size: 20px;    font-weight: 300;  }}// 引用区块（模仿 Layui）// 
      
       Lorem ipsum dolor sit amet.
      
.blockquote() {
      margin-bottom: 10px;  padding: 15px;  line-height: 22px;  border-left: 5px solid #009688;  border-radius: 0 2px 2px 0;  background-color: #f2f2f2;}// 徽章 (椭圆、小圆点)// 10.badge(...) {
      position: relative;  display: inline-block;  font-size: 12px;  color: #fff;  background-color: #FF5722;}.badge(ellipse) {
      min-width: 8px;  height: 18px;  padding: 2px 6px;  text-align: center;  line-height: 18px;  border-radius: 9px;}.badge(dot) {
      width: 8px;  height: 8px;  border-radius: 50%;}// 关闭按钮// ×.close() {
      position: relative;  -webkit-appearance: none;  padding: 0;  cursor: pointer;  background: 0 0;  border: 0;  font-size: 20px;  font-weight: 700;  line-height: 1;  color: #000;  text-shadow: 0 1px 0 #fff;  filter: alpha(opacity=20);  opacity: .2;  &:hover {    color: #000;    text-decoration: none;    cursor: pointer;    filter: alpha(opacity=50);    opacity: .5;  }  &:before {
        content: '';    position: absolute;    top: -10px;    left: -10px;    right: -10px;    bottom: -10px;  }}// 1 像素边框问题.onepx(...) {
      position: relative;  &:after {    content: '';    display: block;    position: absolute;    left: 0;    width: 100%;    border-top: 1px solid rgba(7, 17, 27, 0.1);    transform: scaleY(0.5);  }}.onepx(top) {
     &:after { top: 0; } }.onepx(bottom) {
     &:after { bottom: 0; } }.onepx-easy(top, @color: #ccc) {
     box-shadow: inset 0px -1px 1px -1px @color; }.onepx-easy(bottom, @color: #ccc) {
     box-shadow: inset 0px 1px 1px -1px @color; }

5.2 reset

@charset "utg-8";/* CSS Document */html,body,h1,h2,h3,h4,h5,h6,div,dl,dt,dd,ul,ol,li,p,blockquote,pre,hr,figure,table,caption,th,td,form,fieldset,legend,input,button,textarea,menu{
    margin:0;padding:0;}body{
     background-color:#fff;}html,body,fieldset,img,iframe,abbr{
    border:0;}li{
    list-style:none;}textarea{
    overflow:auto;resize:none;}a,button{
    cursor:pointer;}h1,h2,h3,h4,h5,h6,em,strong,b{
    font-weight:bold;}a,a:hover{
    text-decoration:none;}body,textarea,input,button{
        color:#62a1c9;} html,body{
        width:100%;    min-height: 930px;    height: auto;} .hide{
        display: none;} .text-shadow (@string: 0 1px 3px rgba(0, 0, 0, 0.25)) {
        text-shadow: @string;}.box-shadow (@string) {
        -webkit-box-shadow: @string;    -moz-box-shadow:    @string;    box-shadow:         @string;}.drop-shadow (@x: 0, @y: 1px, @blur: 2px, @spread: 0, @alpha: 0.25) {
        -webkit-box-shadow:    @x @y @blur @spread rgba(0, 0, 0, @alpha);    -moz-box-shadow:    @x @y @blur @spread rgba(0, 0, 0, @alpha);    box-shadow:        @x @y @blur @spread rgba(0, 0, 0, @alpha);}.inner-shadow (@x: 0, @y: 1px, @blur: 2px, @spread: 0, @alpha: 0.25) {
        -webkit-box-shadow: inset @x @y @blur @spread rgba(0, 0, 0, @alpha);    -moz-box-shadow:    inset @x @y @blur @spread rgba(0, 0, 0, @alpha);    box-shadow:         inset @x @y @blur @spread rgba(0, 0, 0, @alpha);} .box-sizing (@type: border-box) {
        -webkit-box-sizing: @type;    -moz-box-sizing:    @type;    box-sizing:         @type;} .border-radius (@radius: 5px) {
        -webkit-border-radius: @radius;    -moz-border-radius:    @radius;    border-radius:         @radius;     -moz-background-clip:    padding;    -webkit-background-clip: padding-box;    background-clip:         padding-box;}.border-radiuses (@topright: 0, @bottomright: 0, @bottomleft: 0, @topleft: 0) {
        -webkit-border-top-right-radius:    @topright;    -webkit-border-bottom-right-radius: @bottomright;    -webkit-border-bottom-left-radius:  @bottomleft;    -webkit-border-top-left-radius:     @topleft;     -moz-border-radius-topright:        @topright;    -moz-border-radius-bottomright:     @bottomright;    -moz-border-radius-bottomleft:      @bottomleft;    -moz-border-radius-topleft:         @topleft;     border-top-right-radius:            @topright;    border-bottom-right-radius:         @bottomright;    border-bottom-left-radius:          @bottomleft;    border-top-left-radius:             @topleft;     -moz-background-clip:    padding;     -webkit-background-clip: padding-box;     background-clip:         padding-box; } .opacity (@opacity: 0.5) {
        @tempOpacity: @opacity * 100;    -webkit-opacity:     @opacity;    -moz-opacity:         @opacity;    opacity:         @opacity;    filter:alpha(opacity=@tempOpacity);} .gradient (@startColor: #eee, @endColor: white) {
        background-color: @startColor;    background: -webkit-gradient(linear, left top, left bottom, from(@startColor), to(@endColor));    background: -webkit-linear-gradient(top, @startColor, @endColor);    background: -moz-linear-gradient(top, @startColor, @endColor);    background: -ms-linear-gradient(top, @startColor, @endColor);    background: -o-linear-gradient(top, @startColor, @endColor);}.horizontal-gradient (@startColor: #eee, @endColor: white) {
         background-color: @startColor;    background-image: -webkit-gradient(linear, left top, right top, from(@startColor), to(@endColor));    background-image: -webkit-linear-gradient(left, @startColor, @endColor);    background-image: -moz-linear-gradient(left, @startColor, @endColor);    background-image: -ms-linear-gradient(left, @startColor, @endColor);    background-image: -o-linear-gradient(left, @startColor, @endColor);    background-image: linear-gradient(left, @startColor, @endColor);} .animation (@name, @duration: 300ms, @delay: 0, @ease: ease) {
        -webkit-animation: @name @duration @delay @ease;    -moz-animation:    @name @duration @delay @ease;    -ms-animation:     @name @duration @delay @ease;    animation:           @name @duration @delay @ease;} .transition (@transition) {
        -webkit-transition: @transition;      -moz-transition:    @transition;    -ms-transition:     @transition;     -o-transition:      @transition;    transition:        @transition;}.transform(@string){
        -webkit-transform: @string;    -moz-transform:      @string;    -ms-transform:          @string;    -o-transform:          @string;    transform:               @string;}.scale (@factor) {
        -webkit-transform: scale(@factor);    -moz-transform:      scale(@factor);    -ms-transform:          scale(@factor);    -o-transform:          scale(@factor);    transform:               scale(@factor);}.rotate (@deg) {
        -webkit-transform: rotate(@deg);    -moz-transform:      rotate(@deg);    -ms-transform:          rotate(@deg);    -o-transform:          rotate(@deg);    transform:               rotate(@deg);}.skew (@deg, @deg2) {
        -webkit-transform:       skew(@deg, @deg2);    -moz-transform:      skew(@deg, @deg2);    -ms-transform:          skew(@deg, @deg2);    -o-transform:          skew(@deg, @deg2);    transform:               skew(@deg, @deg2);}.translate (@x, @y:0) {
        -webkit-transform:       translate(@x, @y);    -moz-transform:      translate(@x, @y);    -ms-transform:          translate(@x, @y);    -o-transform:          translate(@x, @y);    transform:               translate(@x, @y);}.translate3d (@x, @y: 0, @z: 0) {
        -webkit-transform:       translate3d(@x, @y, @z);    -moz-transform:      translate3d(@x, @y, @z);    -ms-transform:          translate3d(@x, @y, @z);    -o-transform:          translate3d(@x, @y, @z);    transform:               translate3d(@x, @y, @z);}.perspective (@value: 1000) {
        -webkit-perspective:     @value;    -moz-perspective:     @value;    -ms-perspective:     @value;    perspective:         @value;}.transform-origin (@x:center, @y:center) {
        -webkit-transform-origin: @x @y;    -moz-transform-origin:    @x @y;    -ms-transform-origin:     @x @y;    -o-transform-origin:      @x @y;    transform-origin:            @x @y;} .keyframes(@name, @frames) {
        @-webkit-keyframes @name { @frames(); }    @-moz-keyframes @name {
     @frames(); }    @-ms-keyframes @name {
     @frames(); }    @-o-keyframes @name {
     @frames(); }    @keyframes @name {
     @frames(); }} .animation(@arg){
        -moz-animation:@arg;    -webkit-animation:@arg;    -o-animation:@arg;    -ms-animation:@arg;    animation:@arg;}

5.3 手机端 rem

关键代码 js

(function(doc, win) {              var docEl = doc.documentElement,                  resizeEvt = 'orientationchange' in window ? 'orientationchange' : 'resize',                  recalc = function() {                      var clientWidth = docEl.clientWidth;                      if (!clientWidth) return;                      if(clientWidth>=750){                        docEl.style.fontSize = '100px'                      }else{                        docEl.style.fontSize = 100 * (clientWidth / 750) + 'px';                      }                            };              if (!doc.addEventListener) return;              win.addEventListener(resizeEvt, recalc, false);              doc.addEventListener('DOMContentLoaded', recalc, false);          })(document, window);

unit  less

@size: 100*1rem;  /*修改大小的函数*/  .width(@num) {
        width: @num / @size;  }    .height(@num) {
        height: @num / @size;  }

web less

.wrap{ .width(100); } 

 

6.参考链接