Node.js服务器端呈现SVG: 探索headless-mermaid插件

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svg

headless

renderer

JavaScript

下载需积分: 50 | 13KB | 更新于2024-12-07 | 171 浏览量 | 举报收藏

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mermaid.js是一个基于JavaScript的图表库，能够将文本和代码转换成图表，广泛用于自动化文档生成和图表展示。然而，由于它通常需要浏览器环境来渲染图形，这在服务器端应用中便成了一个难题。headless-mermaid通过借助于headless-chromium，一种没有图形用户界面的浏览器，实现了在服务器端环境中生成和渲染SVG图表的能力。 headless-mermaid的安装过程非常简单，可以通过npm包管理器进行安装，这意味着它能够很方便地集成到现有的Node.js项目中。在使用上，headless-mermaid提供了异步API，支持async/await语法，使得调用更加简洁。它的主要函数是execute，它接受mermaid代码作为输入，可选地还包括一些配置和脚本，以生成对应的SVG输出。配置部分是headless-mermaid的一大亮点，它允许开发者指定多种参数，这些参数与在浏览器端使用mermaid.initialize()时所使用的配置非常相似。这为开发者提供了灵活性，可以根据需要定制渲染过程和输出结果。例如，可以调整图表的尺寸、颜色主题、布局方式等，以适应不同的应用场景。作为一个服务器端呈现工具，headless-mermaid对于那些需要在服务器端生成图形的场景特别有用，比如报表生成、文档自动化等。它避免了将客户端渲染的结果转换为服务器端可利用的形式的麻烦，并且能够提高渲染效率，因为所有的处理都在服务器端完成。此外，使用headless-mermaid可以减少对浏览器环境的依赖，从而进一步优化服务器端应用的性能和扩展性。考虑到标签“svg headless renderer mermaidjs JavaScript”，headless-mermaid的开发团队特别强调了其对SVG格式的支持。SVG是一种基于XML的矢量图形格式，广泛用于Web上。通过使用SVG，开发者能够生成清晰、可缩放的图形，并且可以轻松地通过CSS进行样式调整，以及利用JavaScript进行动态交互。headless渲染则强调了该工具无需传统浏览器环境即可运行的能力，这在创建各种服务器端工具和服务时是一个很大的优势。文件名称列表“headless-mermaid-master”表明用户下载或检出的是包含源代码、文档和可能的示例的项目源代码仓库的主分支。在项目结构中，这通常意味着包含了完整的功能和最新的开发状态，而不包含版本发布中可能的简化或优化。综上所述，headless-mermaid为Node.js提供了强大的服务器端渲染能力，使得开发者能够利用mermaid.js库生成高质量、可定制的SVG图形，同时保持了服务器端应用的性能和效率。"

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Node.js服务器端呈现SVG: 探索headless-mermaid插件（9个子文件）

package-lock.json 16KB

README.md 3KB

.npmignore 10B

index.js 1KB

.gitignore 2KB

LICENSE 1KB

output.svg 18KB

dependabot.yml 106B

package.json 657B

共 9 条

mermaid-demo

mermaid是一款开源的画流程图、时序图、甘特度的工具，提供了命令行和html两种使用方法。本例是在html中使用mermaid画出各种图的例子。

chrome-headless-shell-linux64-133.0.6943.53.zip

chrome-headless-shell-linux64-133.0.6943.53.zip文件是一个压缩包，包含了一个特定版本的Chrome无头模式（Headless）的Linux 64位版本。Chrome无头模式是指一种运行环境，其中Chrome浏览器在没有图形用户界面（GUI...

{"@timestamp":"2025-03-31T13:45:02.132Z", "log.level": "WARN", "message":"This node is a fully-formed single-node cluster with cluster UUID [2TJKMZR1TNKLU5kjkpihFA], but it is configured as if to discover other nodes and form a multi-node cluster via the [discovery.seed_hosts=[elasticsearch-master-headless]] setting. Fully-formed clusters do not attempt to discover other nodes, and nodes with different cluster UUIDs cannot belong to the same cluster. The cluster UUID persists across restarts and can only be changed by deleting the contents of the node's data path(s). Remove the discovery configuration to suppress this message.", "ecs.version": "1.2.0","service.name":"ES_ECS","event.dataset":"elasticsearch.server","process.thread.name":"elasticsearch[elasticsearch-master-0][scheduler][T#1]","log.logger":"org.elasticsearch.cluster.coordination.Coordinator","elasticsearch.cluster.uuid":"2TJKMZR1TNKLU5kjkpihFA","elasticsearch.node.id":"mtYdBdhQRLW1Fe7ebdHtrA","elasticsearch.node.name":"elasticsearch-master-0","elasticsearch.cluster.name":"elasticsearch"} {"@timestamp":"2025-03-31T13:45:03.995Z", "log.level": "WARN", "message":"received plaintext http traffic on an https channel, closing connection Netty4HttpChannel{localAddress=/127.0.0.1:9200, remoteAddress=/127.0.0.1:48954}", "ecs.version": "1.2.0","service.name":"ES_ECS","event.dataset":"elasticsearch.server","process.thread.name":"elasticsearch[elasticsearch-master-0][transport_worker][T#1]","log.logger":"org.elasticsearch.xpack.security.transport.netty4.SecurityNetty4HttpServerTransport","elasticsearch.cluster.uuid":"2TJKMZR1TNKLU5kjkpihFA","elasticsearch.node.id":"mtYdBdhQRLW1Fe7ebdHtrA","elasticsearch.node.name":"elasticsearch-master-0","elasticsearch.cluster.name":"elasticsearch"} {"@timestamp":"2025-03-31T13:45:11.239Z", "log.level": "WARN", "message":"received plaintext http traffic on an https channel, closing connection Netty4HttpChannel{localAddress=/127.0.0.1:9200, remoteAddress=/127.0.0.1:48958}", "ecs.version": "1.2.0","service.name":"ES_ECS","event.dataset":"elasticsearch.server","process.thread.name":"elasticsearch[elasticsearch-master-0][transport_worker][T#1]","log.logger":"org.elasticsearch.xpack.security.transport.netty4.SecurityNetty4HttpServerTransport","elasticsearch.cluster.uuid":"2TJKMZR1TNKLU5kjkpihFA","elasticsearch.node.id":"mtYdBdhQRLW1Fe7ebdHtrA","elasticsearch.node.name":"elasticsearch-master-0","elasticsearch.cluster.name":"elasticsearch"}

消息提到节点已经是一个完全形成的单节点集群，但配置了发现其他节点以形成多节点集群的设置。这里的关键点在于，当Elasticsearch节点已经形成集群（有持久化的UUID），它不会再去通过discovery.seed_hosts寻找其他...

【CI应用实战】：ChromeDriver 130.0.6692.0的持续集成实践

![【CI应用实战】：ChromeDriver 130.0.6692.0的持续集成实践]... ...# 1. ChromeDriver持续集成简介

分析以下html 使用这个js 在Java中实现markdown转思维导图生成html： <html> <head> <meta charset="UTF-8" /> <meta name="viewport" content="width=device-width, initial-scale=1.0" /> <meta http-equiv="X-UA-Compatible" content="ie=edge" /> <title>Markmap</title> <style> * { margin: 0; padding: 0; } html { font-family: ui-sans-serif, system-ui, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', 'Segoe UI Symbol', 'Noto Color Emoji'; } #mindmap { display: block; width: 100vw; height: 100vh; } .markmap-dark { background: #27272a; color: white; } </style> <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/[email protected]/dist/style.css"> <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/[email protected]/dist/katex.min.css"> </head> <body> <svg id="mindmap"></svg> <script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/d3.min.js"></script> <script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/browser/index.js"></script> <script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/index.js"></script> <script>(e=>{window.WebFontConfig={custom:{families:["KaTeX_AMS","KaTeX_Caligraphic:n4,n7","KaTeX_Fraktur:n4,n7","KaTeX_Main:n4,n7,i4,i7","KaTeX_Math:i4,i7","KaTeX_Script","KaTeX_SansSerif:n4,n7,i4","KaTeX_Size1","KaTeX_Size2","KaTeX_Size3","KaTeX_Size4","KaTeX_Typewriter"]},active:()=>{e().refreshHook.call()}}})(()=>window.markmap)</script><script src="https://cdn.jsdelivr.net/npm/[email protected]/webfontloader.js" defer></script><script>(()=>{setTimeout(()=>{const{markmap:S,mm:Q}=window,$=new S.Toolbar;$.attach(Q);const I=$.render();I.setAttribute("style","position:absolute;bottom:20px;right:20px"),document.body.append(I)})})()</script> <script>((l,U,M,R)=>{const N=l();window.mm=N.Markmap.create("svg#mindmap",(U||N.deriveOptions)(R),M),window.matchMedia("(prefers-color-scheme: dark)").matches&&document.documentElement.classList.add("markmap-dark")})(()=>window.markmap,null,{"content":"markmap","children":[{"content":"Links","children":[{"content":"Website","children":[],"payload":{"tag":"li","lines":"8,9"}},{"content":"GitHub","children":[],"payload":{"tag":"li","lines":"9,11"}}],"payload":{"tag":"h2","lines":"6,7"}},{"content":"Related Projects","children":[{"content":"coc-markmap for Neovim","children":[],"payload":{"tag":"li","lines":"13,14"}},{"content":"markmap-vscode for VSCode","children":[],"payload":{"tag":"li","lines":"14,15"}},{"content":"eaf-markmap for Emacs","children":[],"payload":{"tag":"li","lines":"15,17"}}],"payload":{"tag":"h2","lines":"11,12"}},{"content":"Features","children":[{"content":"Lists","children":[{"content":"strong ~~del~~ italic highlight","children":[],"payload":{"tag":"li","lines":"23,24"}},{"content":"inline code","children":[],"payload":{"tag":"li","lines":"24,25"}},{"content":"<svg width=\"16\" height=\"16\" viewBox=\"0 -3 24 24\"><path d=\"M19 3H5a2 2 0 0 0-2 2v14a2 2 0 0 0 2 2h14a2 2 0 0 0 2-2V5a2 2 0 0 0-2-2m-9 14-5-5 1.41-1.41L10 14.17l7.59-7.59L19 8z\"/></svg> checkbox","children":[],"payload":{"tag":"li","lines":"25,26"}},{"content":"Katex: <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><semantics><mrow><mi>x</mi><mo>=</mo><mfrac><mrow><mo>−</mo><mi>b</mi><mo>±</mo><msqrt><mrow><msup><mi>b</mi><mn>2</mn></msup><mo>−</mo><mn>4</mn><mi>a</mi><mi>c</mi></mrow></msqrt></mrow><mrow><mn>2</mn><mi>a</mi></mrow></mfrac></mrow><annotation encoding=\"application/x-tex\">x = {-b \\pm \\sqrt{b^2-4ac} \\over 2a}</annotation></semantics></math>x=2a−b±b2−4ac<svg xmlns=\"http://www.w3.org/2000/svg\" width=\"400em\" height=\"1.08em\" viewBox=\"0 0 400000 1080\" preserveAspectRatio=\"xMinYMin slice\"><path d=\"M95,702\nc-2.7,0,-7.17,-2.7,-13.5,-8c-5.8,-5.3,-9.5,-10,-9.5,-14\nc0,-2,0.3,-3.3,1,-4c1.3,-2.7,23.83,-20.7,67.5,-54\nc44.2,-33.3,65.8,-50.3,66.5,-51c1.3,-1.3,3,-2,5,-2c4.7,0,8.7,3.3,12,10\ns173,378,173,378c0.7,0,35.3,-71,104,-213c68.7,-142,137.5,-285,206.5,-429\nc69,-144,104.5,-217.7,106.5,-221\nl0 -0\nc5.3,-9.3,12,-14,20,-14\nH400000v40H845.2724\ns-225.272,467,-225.272,467s-235,486,-235,486c-2.7,4.7,-9,7,-19,7\nc-6,0,-10,-1,-12,-3s-194,-422,-194,-422s-65,47,-65,47z\nM834 80h400000v40h-400000z\"/></svg>","children":[{"content":"More Katex Examples","children":[],"payload":{"tag":"li","lines":"27,28"}}],"payload":{"tag":"li","lines":"26,28","fold":1}},{"content":"Now we can wrap very very very very long text with the maxWidth option","children":[],"payload":{"tag":"li","lines":"28,29"}},{"content":"Ordered list","children":[{"content":"1. item 1","children":[],"payload":{"tag":"li","lines":"30,31","listIndex":1}},{"content":"2. item 2","children":[],"payload":{"tag":"li","lines":"31,33","listIndex":2}}],"payload":{"tag":"li","lines":"29,33"}}],"payload":{"tag":"h3","lines":"21,22"}},{"content":"Blocks","children":[{"content":"

console.log('hello, JavaScript')\n

","children":[],"payload":{"tag":"pre","lines":"35,38"}},{"content":"\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n

Products	Price
Apple	4
Banana	2

","children":[],"payload":{"tag":"table","lines":"39,43"}},{"content":"","children":[],"payload":{"tag":"img","lines":"44,45"}}],"payload":{"tag":"h3","lines":"33,34"}}],"payload":{"tag":"h2","lines":"17,18"}}]},{"colorFreezeLevel":2})</script> </body> </html>

创建一个HTML模板，其中包含必要的CSS和JS引用，以及一个用于放置思维导图的SVG容器。2.在模板中，我们预留一个位置用于插入Markdown数据（即上述HTML中script标签内的数据）。3.在Java中，读取Markdown文件或字符串...

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Node.js服务器端呈现SVG: 探索headless-mermaid插件

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