177 lines
4.4 KiB
Markdown
177 lines
4.4 KiB
Markdown
---
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title: "Mermaid 图表语法示例"
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date: 2026-05-19T10:00:00+08:00
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draft: false
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description: "Mermaid 官方语法示例合集：流程图、时序图、类图、状态图、甘特图、饼图、Git 图等全部图表示范。"
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tags:
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- Mermaid
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- 图表
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- 语法
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poet: |
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大音希声，大象无形。
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——老子，中国，约前571–约前471
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---
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> 原文：[Mermaid Examples](https://mermaid.js.org/syntax/examples.html)
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# Examples
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This page contains a collection of examples of diagrams and charts that can be created through mermaid and its myriad applications.
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**If you wish to learn how to support mermaid on your webpage, read the [Beginner's Guide](../config/usage.md?id=usage).**
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**If you wish to learn about mermaid's syntax, Read the [Diagram Syntax](../syntax/flowchart.md?id=flowcharts-basic-syntax) section.**
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## Basic Pie Chart
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```mermaid
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pie title NETFLIX
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"Time spent looking for movie" : 90
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"Time spent watching it" : 10
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```
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```mermaid
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pie title What Voldemort doesn't have?
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"FRIENDS" : 2
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"FAMILY" : 3
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"NOSE" : 45
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```
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## Basic sequence diagram
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```mermaid
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sequenceDiagram
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Alice ->> Bob: Hello Bob, how are you?
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Bob-->>John: How about you John?
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Bob--x Alice: I am good thanks!
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Bob-x John: I am good thanks!
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Note right of John: Bob thinks a long<br/>long time, so long<br/>that the text does<br/>not fit on a row.
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Bob-->Alice: Checking with John...
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Alice->John: Yes... John, how are you?
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```
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## Basic flowchart
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```mermaid
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graph LR
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A[Square Rect] -- Link text --> B((Circle))
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A --> C(Round Rect)
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B --> D{Rhombus}
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C --> D
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```
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## Larger flowchart with some styling
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```mermaid
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graph TB
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sq[Square shape] --> ci((Circle shape))
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subgraph A
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od>Odd shape]-- Two line<br/>edge comment --> ro
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di{Diamond with <br/> line break} -.-> ro(Rounded<br>square<br>shape)
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di==>ro2(Rounded square shape)
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end
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%% Notice that no text in shape are added here instead that is appended further down
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e --> od3>Really long text with linebreak<br>in an Odd shape]
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%% Comments after double percent signs
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e((Inner / circle<br>and some odd <br>special characters)) --> f(,.?!+-*ز)
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cyr[Cyrillic]-->cyr2((Circle shape Начало));
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classDef green fill:#9f6,stroke:#333,stroke-width:2px;
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classDef orange fill:#f96,stroke:#333,stroke-width:4px;
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class sq,e green
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class di orange
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```
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## SequenceDiagram: Loops, alt and opt
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```mermaid
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sequenceDiagram
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loop Daily query
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Alice->>Bob: Hello Bob, how are you?
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alt is sick
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Bob->>Alice: Not so good :(
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else is well
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Bob->>Alice: Feeling fresh like a daisy
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end
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opt Extra response
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Bob->>Alice: Thanks for asking
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end
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end
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```
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## SequenceDiagram: Message to self in loop
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```mermaid
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sequenceDiagram
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participant Alice
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participant Bob
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Alice->>John: Hello John, how are you?
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loop HealthCheck
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John->>John: Fight against hypochondria
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end
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Note right of John: Rational thoughts<br/>prevail...
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John-->>Alice: Great!
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John->>Bob: How about you?
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Bob-->>John: Jolly good!
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```
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## Sequence Diagram: Blogging app service communication
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```mermaid
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sequenceDiagram
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participant web as Web Browser
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participant blog as Blog Service
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participant account as Account Service
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participant mail as Mail Service
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participant db as Storage
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Note over web,db: The user must be logged in to submit blog posts
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web->>+account: Logs in using credentials
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account->>db: Query stored accounts
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db->>account: Respond with query result
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alt Credentials not found
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account->>web: Invalid credentials
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else Credentials found
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account->>-web: Successfully logged in
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Note over web,db: When the user is authenticated, they can now submit new posts
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web->>+blog: Submit new post
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blog->>db: Store post data
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par Notifications
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blog--)mail: Send mail to blog subscribers
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blog--)db: Store in-site notifications
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and Response
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blog-->>-web: Successfully posted
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end
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end
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```
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## A commit flow diagram.
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```mermaid
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gitGraph:
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commit "Ashish"
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branch newbranch
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checkout newbranch
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commit id:"1111"
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commit tag:"test"
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checkout main
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commit type: HIGHLIGHT
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commit
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merge newbranch
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commit
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branch b2
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commit
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```
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<!--- cspell:ignore Ashish newbranch --->
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