本篇文章带大家了解一下vscode中的代码片段，介绍一下代码块种类，以及自定义代码片段的方法，希望对大家有所帮助！
一、前言较为全的指南：
《vs code 代码片段完全入门指南》
https://chinese.freecodecamp.org/news/definitive-guide-to-snippets-visual-studio-code/
一键生成代码块工具：https://snippet-generator.app/
windows系统: 文件 > 首选项 > 用户代码片段 mac系统: code > 首选项 > 用户片段
二、创建代码块种类
全局代码片段（每种语言环境下都能触发代码块）：新建全局代码片段会在 snippets 目录下生成 .code-snippets 为后缀的配置文件；【推荐学习：《vscode入门教程》】
针对特定语言类型（只能在对应语言环境下才能触发）：而新建对应语言的代码片段会生成 对应语言 + .json 的配置文件；
为某一工作区（项目）创建的代码块；
新建
输入 react 自动创建一个 react.code-snippets 文件，全局创建则在本机文档目录，项目创建则在项目目录内；
{ // place your 全局 snippets here. each snippet is defined under a snippet name and has a scope, prefix, body and // description. add comma separated ids of the languages where the snippet is applicable in the scope field. if scope // is left empty or omitted, the snippet gets applied to all languages. the prefix is what is // used to trigger the snippet and the body will be expanded and inserted. possible variables are: // $1, $2 for tab stops, $0 for the final cursor position, and ${1:label}, ${2:another} for placeholders. // placeholders with the same ids are connected. // example: // "print to console": { // "scope": "javascript,typescript", // "prefix": "log", // "body": [ // "console.log('$1');", // "$2" // ], // "description": "log output to console" // }}
创建了一个 dva 的模版：
{ // place your 全局 snippets here. each snippet is defined under a snippet name and has a scope, prefix, body and // description. add comma separated ids of the languages where the snippet is applicable in the scope field. if scope // is left empty or omitted, the snippet gets applied to all languages. the prefix is what is // used to trigger the snippet and the body will be expanded and inserted. possible variables are: // $1, $2 for tab stops, $0 for the final cursor position, and ${1:label}, ${2:another} for placeholders. // placeholders with the same ids are connected. // example: // "print to console": { // "scope": "javascript,typescript", // "prefix": "log", // "body": [ // "console.log('$1');", // "$2" // ], // "description": "log output to console" // } // dva 基础布局结构 "dva-basic": { "prefix": "lll_dva_basic", "body": [ "import { effect, reducer, subscription } from 'umi';", "", "export interface ${1:xxxxmodeltype} {", " namespace: '${2:xxxx}';", " state: ${3:ixxxxmodelstate};", " effects: {", " initdataeffect: effect;", " };", " reducers: {", " updatestate: reducer<${3:ixxxxmodelstate}>;", " };", " subscriptions: { setup: subscription };", "}", "", "export interface ${3:ixxxxmodelstate} {", " ${4:textdata}: any;", "}", "", "const state: ${3:ixxxxmodelstate} = {", " ${4:textdata}: null,", "};", "", "const qualificationsetting: ${1:xxxxmodeltype} = {", " namespace: '${2:xxxx}',", " state: state,", "", " effects: {", " // 初始化数据", " *initdataeffect({ payload }, { select, call, put }) {", " try {", " } catch (error) {}", " },", " },", "", " reducers: {", " updatestate(state, { data }) {", " return { ...state, ...data };", " },", " },", "", " subscriptions: {", " setup({ dispatch, history }) {", " return history.listen(({ pathname }) => {", " if (pathname === '/') {", " // 初始化数据", " dispatch({ type: 'initdataeffect' });", " }", " });", " },", " },", "};", "", "export default qualificationsetting;", "" ], "description": "dva-basic" }ƒ}
字段解释
dva-basic 是代码片段的名字。如果没有 description，它就会出现在智能建议的列表里。
prefix 属性定义了代码片段的触发文本。它可以是一个字符串或者一个字符串数组（如果你想有多个触发文本）。前缀的子字符串同样可以触发，在我们的例子里，输入h1一样能匹配到我们的代码片段。
body 属性代表了要插入编辑器的内容。它是一个字符串数组，可能一行或者多行。在插入之前会被合并成一段。
description 属性提供了代码片段的更多描述。它是可选的。
scope 属性允许你指定特定的语言类型，你可以使用逗号来分割多种语言。它也是可选的。当然，对于特定于语言的代码片段文件来说是多余的。
tab stops （使用 tabs 切换，还有很多用法自行挖掘，比如可选项）
tab stops由  **∗∗ 和 ∗∗序号∗∗ 组成，就像 ‘**  和 **序号** 组成，就像 `∗∗ 和 ∗∗序号∗∗ 组成，就像 ‘1。1‘代表了第一个位置，‘1`代表了第一个位置，`1‘代表了第一个位置，‘2代表了第二个位置，以此类推。$0`代表退出代码片段，以及最后光标停留的位置；
多个 tab 停留，使用相同序号即可；
三、后记本文章是快速入门指南；
深入学习可参考前言中的较为完整的指南；
可使用前言中的快速生成工具，然后再完善；
更多关于vscode的相关知识，请访问：vscode教程！！
以上就是vscode新手入门之浅析代码片段，看看创建方法的详细内容。