New update

.gitattributes

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+*.html  linguist-language=javascript
+*.css   linguist-language=javascript
+*.js    linguist-language=javascript

.gitignore

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+node_modules

README.md

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-# manual-less
+# Less
+
+Less 是一种动态层叠样式表语言。

SUMMARY.md

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+# Summary
+
+* [Less](README.md)
+

book.json

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+{
+    "root": "",
+    "structure": {
+        "readme": "README.md",
+        "summary": "SUMMARY.md"
+    },
+    "title": "Less",
+    "description": "Less 手册",
+    "author": "Kuriv Vesti",
+    "isbn": "",
+    "language": "zh-hans",
+    "direction": "ltr",
+    "gitbook": ">=3.0.0",
+    "plugins": [
+        "back-to-top-button", "chapter-fold", "favicon", "hide-element", "lightbox", "-highlight", "prism", "-lunr", "-search", "search-pro", "splitter"
+    ],
+    "pluginsConfig": {
+        "favicon": {
+            "shortcut": "favicon.ico",
+            "bookmark": "favicon.ico",
+            "appleTouch": "favicon.png",
+            "appleTouchMore": {
+                "120x120": "favicon-120x120.png",
+                "180x180": "favicon-180x180.png"
+            }
+        },
+        "hide-element": {
+            "elements": [".gitbook-link"]
+        },
+        "prism": {
+            "css": ["prismjs/themes/prism-okaidia.css"]
+        }
+    }
+}

book/.gitattributes

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+*.html  linguist-language=javascript
+*.css   linguist-language=javascript
+*.js    linguist-language=javascript

book/.gitignore

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+node_modules

book/LICENSE

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+MIT License
+
+Copyright (c) 2020 Kuriv Vesti
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

book/gitbook/gitbook-plugin-back-to-top-button/plugin.css

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+.back-to-top {
+    position: fixed;
+    bottom: 25px;
+    right: 25px;
+    background: rgba(0, 0, 0, 0.5);
+    width: 50px;
+    height: 50px;
+    display: block;
+    text-decoration: none;
+    -webkit-border-radius: 35px;
+    -moz-border-radius: 35px;
+    border-radius: 35px;
+    display: none;
+}
+.back-to-top i {
+    color: #fff;
+    margin: 0;
+    position: relative;
+    left: 15px;
+    top: 14px;
+    font-size: 22px;
+}
+.back-to-top:hover {
+    background: rgba(0, 0, 0, 0.9);
+    cursor: pointer;	
+}
+.book.color-theme-1 .back-to-top {
+    background: rgba(112, 66, 20, 0.5);
+}
+.book.color-theme-1 .back-to-top i {
+    color: #f3eacb;
+}
+.book.color-theme-1 .back-to-top:hover {
+    background: rgba(112, 66, 20, 0.9);
+}
+.book.color-theme-2 .back-to-top {
+    background: rgba(189, 202, 219, 0.5);
+}
+.book.color-theme-2 .back-to-top i {
+    color: #1C1F2B;
+}
+.book.color-theme-2 .back-to-top:hover {
+    background: rgba(189, 202, 219, 0.9);
+}
+
+@media only screen 
+  and (min-device-width: 320px) 
+  and (max-device-width: 480px)
+  and (-webkit-min-device-pixel-ratio: 2)
+  and (orientation: portrait) {
+	.back-to-top {
+		bottom: 10px;
+		right: 10px;
+	}
+}

book/gitbook/gitbook-plugin-back-to-top-button/plugin.js

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+var gitbook = window.gitbook;
+
+gitbook.events.on('page.change', function() {
+
+	var back_to_top_button = ['<div class="back-to-top"><i class="fa fa-arrow-up"></i></div>'].join("");
+	$(".book").append(back_to_top_button)
+
+	$(".back-to-top").hide();
+
+	$('.book-body,.body-inner').on('scroll', function () {
+		if ($(this).scrollTop() > 100) { 
+			$('.back-to-top').fadeIn();
+		} else {
+			$('.back-to-top').fadeOut();
+		}
+	});
+
+	$('.back-to-top').click(function () { 
+		$('.book-body,.body-inner').animate({
+			scrollTop: 0
+		}, 800);
+		return false;
+	});
+
+});

book/gitbook/gitbook-plugin-chapter-fold/chapter-fold.css

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+.book .book-summary .chapter > .articles {
+	overflow: hidden;
+	max-height: 0px;
+}
+
+.book .book-summary .chapter.expanded > .articles {
+	max-height: 9999px;
+}
+
+.book .book-summary .exc-trigger {
+	position: absolute;
+  	left: 12px;
+  	top: 12px;
+}
+
+.book .book-summary ul.summary li a,
+.book .book-summary ul.summary li span {
+	padding-left: 30px;
+}
+
+.book .book-summary .exc-trigger:before {
+  	content: "\f105";
+}
+
+.book .book-summary .expanded > a .exc-trigger:before,
+.book .book-summary .expanded > span .exc-trigger:before {
+	content: "\f107";
+}
+

book/gitbook/gitbook-plugin-chapter-fold/chapter-fold.js

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+require(['gitbook', 'jQuery'], function(gitbook, $) {
+  var TOGGLE_CLASSNAME = 'expanded',
+      CHAPTER = '.chapter',
+      ARTICLES = '.articles',
+      TRIGGER_TEMPLATE = '<i class="exc-trigger fa"></i>',
+      LS_NAMESPACE = 'expChapters';
+  var init = function () {
+    // adding the trigger element to each ARTICLES parent and binding the event
+    var chapterLink = $(ARTICLES).parent(CHAPTER).children('a');
+    chapterLink.append($(TRIGGER_TEMPLATE));
+    chapterLink.on('click', function (e) {
+      e.preventDefault();
+      //e.stopPropagation();
+      toggle($(e.target).closest(CHAPTER));
+    });  
+
+    expand(lsItem());
+    //expand current selected chapter with it's parents
+    collapse($(CHAPTER));
+    var activeChapter = $(CHAPTER + '.active');
+    expand(activeChapter);
+    expand(activeChapter.parents(CHAPTER));
+  } 
+  //on page.change will happend the function.
+
+  var toggle = function ($chapter) {
+    if ($chapter.hasClass('expanded')) {
+      collapse($chapter);
+    } else {
+      expand($chapter);
+      //$chapter.addClass('active').siblings().removeClass('active');
+    }
+  }
+  var collapse = function ($chapter) {
+    if ($chapter.length && $chapter.hasClass(TOGGLE_CLASSNAME)) {
+      $chapter.removeClass(TOGGLE_CLASSNAME);
+      lsItem($chapter);
+    }
+  }
+  var expand = function ($chapter) {
+    if ($chapter.length && !$chapter.hasClass(TOGGLE_CLASSNAME)) {
+      $chapter.addClass(TOGGLE_CLASSNAME);
+      lsItem($chapter);
+    }
+  }
+  var lsItem = function () {
+    var map = JSON.parse(localStorage.getItem(LS_NAMESPACE)) || {}
+    if (arguments.length) {
+      var $chapters = arguments[0];
+      $chapters.each(function (index, element) {
+        var level = $(this).data('level');
+        var value = $(this).hasClass(TOGGLE_CLASSNAME);
+        map[level] = value;
+      })
+      localStorage.setItem(LS_NAMESPACE, JSON.stringify(map));
+    } else {
+      return $(CHAPTER).map(function(index, element){
+        if (map[$(this).data('level')]) {
+          return this;
+        }
+      })
+    }
+  }
+  gitbook.events.bind('page.change', function() {
+    init()
+  }); 
+});