一、简介

为什么要学习LESS?
肯定是方便啊，你可以理解为还是css,只不过是代码写的少又简，代码复用性强，维护性好，就好比封装一样，很多地方用了一个代码，我不可能一个个去改，这样的话太费劲了。我改一遍然后样式就全变了，这样不香吗。这时候就less就出现了。
1.学习地址：https://www.w3cschool.cn/less/
2.官网：https://less.bootcss.com/

二、有两种使用的方式

（一）电脑安装less使用

1.电脑首先要安装node.js

下载地址：http://nodejs.cn/download/
检测是否安装成功：window键+R键调用命令窗口，输入cmd。输入node -v。有版本号则说明安装成功。

2.电脑安装less（是基于node安装的）

安装命令：(npm 是一款nodeJs的包管理工具，是属于国外的一款镜像工具。所以此命令的执行需要在网络相对较好的地方，此步执行非常慢。)
安装命令：

npm install -g less

检测是否安装成功的命令（查看版本）：

lessc -v

3.打开vscode编辑器，找到“扩展”——“Easy LESS”下载

4.创建less文件

在css文件夹里创建一个后缀名为.less的文件，当在里面写好代码之后，保存就会自动编译出一份css文件，那我们在html文件引入的时候引入的是css文件。

5.更改

每次修改less文件里面的代码即可，一保存，css文件也会发生相同的变化。

（二）电脑不安装less,通过引入文件使用

1.目录结构以及引用

代码：（目前引入的是线上cdn,可以下载到本地，引入本地的文件，这样不联网也能使用。）

（1）线上：

<link rel="stylesheet/less" type="text/css" href="./css/my.less" />
<script src="https://cdn.jsdelivr.net/npm/less@4"></script>

（2）线下：

把内容复制出来，到自己的项目目录里面创建一个less.js文件放进去。然后再引入。

整体代码：

<link rel="stylesheet/less" type="text/css" href="./css/my.less" />
<script src="./js/less.js"></script>

2.less.js文件内容

/**
 * Less - Leaner CSS v4.1.3
 * http://lesscss.org
 * 
 * Copyright (c) 2009-2022, Alexis Sellier <[email protected]>
 * Licensed under the Apache-2.0 License.
 *
 * @license Apache-2.0
 */
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l.cancel(),new ie(o,l)}});var ne=g,re=function(e,t,i){this.op=e.trim(),this.operands=t,this.isSpaced=i};re.prototype=Object.assign(new u,{type:"Operation",accept:function(e){this.operands=e.visitArray(this.operands)},eval:function(e){var t,i=this.operands[0].eval(e),n=this.operands[1].eval(e);if(e.isMathOn(this.op)){if(t="./"===this.op?"/":this.op,i instanceof ie&&n instanceof c&&(i=i.toColor()),n instanceof ie&&i instanceof c&&(n=n.toColor()),!i.operate||!n.operate){if((i instanceof re||n instanceof re)&&"/"===i.op&&e.math===ne.PARENS_DIVISION)return new re(this.op,[i,n],this.isSpaced);throw{type:"Operation",message:"Operation on an invalid type"}}return i.operate(e,t,n)}return new re(this.op,[i,n],this.isSpaced)},genCSS:function(e,t){this.operands[0].genCSS(e,t),this.isSpaced&&t.add(" "),t.add(this.op),this.isSpaced&&t.add(" "),this.operands[1].genCSS(e,t)}});var se=function(e,t){if(this.value=e,this.noSpacing=t,!e)throw new Error("Expression requires an array 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Boolean(this.func)},e.prototype.call=function(e){var t=this;Array.isArray(e)||(e=[e]);var i=this.func.evalArgs;!1!==i&&(e=e.map((function(e){return e.eval(t.context)})));var n=function(e){return!("Comment"===e.type)};return e=e.filter(n).map((function(e){if("Expression"===e.type){var t=e.value.filter(n);return 1===t.length?e.parens&&"/"===t[0].op?e:t[0]:new se(t)}return e})),!1===i?this.func.apply(this,function(e,t,i){if(i||2===arguments.length)for(var n,r=0,s=t.length;r<s;r++)!n&&r in t||(n||(n=Array.prototype.slice.call(t,0,r)),n[r]=t[r]);return e.concat(n||t)}([this.context],e)):this.func.apply(this,e)},e}(),ae=function(e,t,i,n){this.name=e,this.args=t,this.calc="calc"===e,this._index=i,this._fileInfo=n};ae.prototype=Object.assign(new u,{type:"Call",accept:function(e){this.args&&(this.args=e.visitArray(this.args))},eval:function(e){var t=this,i=e.mathOn;e.mathOn=!this.calc,(this.calc||e.inCalc)&&e.enterCalc();var n,r=function(){(t.calc||e.inCalc)&&e.exitCalc(),e.mathOn=i},s=new oe(this.name,e,this.getIndex(),this.fileInfo());if(s.isValid())try{n=s.call(this.args),r()}catch(e){if(e.hasOwnProperty("line")&&e.hasOwnProperty("column"))throw e;throw{type:e.type||"Runtime",message:"Error evaluating function `"+this.name+"`"+(e.message?": "+e.message:""),index:this.getIndex(),filename:this.fileInfo().filename,line:e.lineNumber,column:e.columnNumber}}if(null!=n)return n instanceof u||(n=new j(n&&!0!==n?n.toString():null)),n._index=this._index,n._fileInfo=this._fileInfo,n;var o=this.args.map((function(t){return t.eval(e)}));return r(),new ae(this.name,o,this.getIndex(),this.fileInfo())},genCSS:function(e,t){t.add(this.name+"(",this.fileInfo(),this.getIndex());for(var i=0;i<this.args.length;i++)this.args[i].genCSS(e,t),i+1<this.args.length&&t.add(", ");t.add(")")}});var le=function(e,t,i){this.name=e,this._index=t,this._fileInfo=i};le.prototype=Object.assign(new u,{type:"Variable",eval:function(e){var t,i=this.name;if(0===i.indexOf("@@")&&(i="@"+new le(i.slice(1),this.getIndex(),this.fileInfo()).eval(e).value),this.evaluating)throw{type:"Name",message:"Recursive variable definition for "+i,filename:this.fileInfo().filename,index:this.getIndex()};if(this.evaluating=!0,t=this.find(e.frames,(function(t){var n=t.variable(i);if(n){if(n.important)e.importantScope[e.importantScope.length-1].important=n.important;return e.inCalc?new ae("_SELF",[n.value]).eval(e):n.value.eval(e)}})))return this.evaluating=!1,t;throw{type:"Name",message:"variable "+i+" is undefined",filename:this.fileInfo().filename,index:this.getIndex()}},find:function(e,t){for(var i=0,n=void 0;i<e.length;i++)if(n=t.call(e,e[i]))return n;return null}});var ue=function(e,t,i){this.name=e,this._index=t,this._fileInfo=i};ue.prototype=Object.assign(new u,{type:"Property",eval:function(e){var t,i=this.name,n=e.pluginManager.less.visitors.ToCSSVisitor.prototype._mergeRules;if(this.evaluating)throw{type:"Name",message:"Recursive property reference for "+i,filename:this.fileInfo().filename,index:this.getIndex()};if(this.evaluating=!0,t=this.find(e.frames,(function(t){var r,s=t.property(i);if(s){for(var o=0;o<s.length;o++)r=s[o],s[o]=new D(r.name,r.value,r.important,r.merge,r.index,r.currentFileInfo,r.inline,r.variable);if(n(s),(r=s[s.length-1]).important)e.importantScope[e.importantScope.length-1].important=r.important;return r=r.value.eval(e)}})))return this.evaluating=!1,t;throw{type:"Name",message:"Property '"+i+"' is undefined",filename:this.currentFileInfo.filename,index:this.index}},find:function(e,t){for(var i=0,n=void 0;i<e.length;i++)if(n=t.call(e,e[i]))return n;return null}});var ce=function(e,t,i,n){this.key=e,this.op=t,this.value=i,this.cif=n};ce.prototype=Object.assign(new u,{type:"Attribute",eval:function(e){return new ce(this.key.eval?this.key.eval(e):this.key,this.op,this.value&&this.value.eval?this.value.eval(e):this.value,this.cif)},genCSS:function(e,t){t.add(this.toCSS(e))},toCSS:function(e){var t=this.key.toCSS?this.key.toCSS(e):this.key;return this.op&&(t+=this.op,t+=this.value.toCSS?this.value.toCSS(e):this.value),this.cif&&(t=t+" "+this.cif),"["+t+"]"}});var he=function(e,t,i,n,r){this.escaped=null==i||i,this.value=t||"",this.quote=e.charAt(0),this._index=n,this._fileInfo=r,this.variableRegex=/@\{([\w-]+)\}/g,this.propRegex=/\$\{([\w-]+)\}/g,this.allowRoot=i};he.prototype=Object.assign(new u,{type:"Quoted",genCSS:function(e,t){this.escaped||t.add(this.quote,this.fileInfo(),this.getIndex()),t.add(this.value),this.escaped||t.add(this.quote)},containsVariables:function(){return this.value.match(this.variableRegex)},eval:function(e){var t=this,i=this.value;function n(e,t,i){var n=e;do{e=n.toString(),n=e.replace(t,i)}while(e!==n);return n}return i=n(i,this.variableRegex,(function(i,n){var r=new le("@"+n,t.getIndex(),t.fileInfo()).eval(e,!0);return r instanceof he?r.value:r.toCSS()})),i=n(i,this.propRegex,(function(i,n){var r=new ue("$"+n,t.getIndex(),t.fileInfo()).eval(e,!0);return r instanceof he?r.value:r.toCSS()})),new he(this.quote+i+this.quote,i,this.escaped,this.getIndex(),this.fileInfo())},compare:function(e){return"Quoted"!==e.type||this.escaped||e.escaped?e.toCSS&&this.toCSS()===e.toCSS()?0:void 0:u.numericCompare(this.value,e.value)}});var fe=function(e,t,i,n){this.value=e,this._index=t,this._fileInfo=i,this.isEvald=n};fe.prototype=Object.assign(new u,{type:"Url",accept:function(e){this.value=e.visit(this.value)},genCSS:function(e,t){t.add("url("),this.value.genCSS(e,t),t.add(")")},eval:function(e){var t,i=this.value.eval(e);if(!this.isEvald&&("string"==typeof(t=this.fileInfo()&&this.fileInfo().rootpath)&&"string"==typeof i.value&&e.pathRequiresRewrite(i.value)?(i.quote||(t=t.replace(/[\(\)'"\s]/g,(function(e){return"\\"+e}))),i.value=e.rewritePath(i.value,t)):i.value=e.normalizePath(i.value),e.urlArgs&&!i.value.match(/^\s*data:/))){var 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//# sourceMappingURL=less.min.js.map

四、总结

1. 使用的方法都在官网里面：

官网地址：https://less.bootcss.com/

2. 什么是npm:

https://chinese.freecodecamp.org/news/what-is-npm-a-node-package-manager-tutorial-for-beginners/

3. 其他学习地址：

https://www.w3cschool.cn/less/