跟着Vam一起学习Typescript（第一期）
一、安装环境与配置 1、命令行安装
npm i -g typescript
2、快捷打开Vs Code编辑器
创建一个项目文件夹，在该文件夹下打开命令行工具，使用code .命令快速打开编辑器（如果计算机提示没有这个命令，请查找到编辑器安装目录bin文件夹下，复制地址。到系统的环境变量下Path，编辑，在前面加上;，粘贴进去就好了）。 3、运行typesript以及同步typesript与js转换
我们在项目文件夹下创建一个名叫demo1.ts文件。这就是我们学习typesript的起点，要记住typesript需要转换成js文件才可以被浏览器识别，所以需要运行命令：
tsc demo1.ts
这样就会在文件夹下生成一个名叫demo1.js文件。是不是感觉每次写完都要运行命令很烦，所以我们推荐使用Vs code编辑器，让你每次编写ts的时候都会同步编译成js文件。教程如下： 在项目文件夹下运行命令：
tsc --init
项目文件夹下，会生成一个tsconfig.json文件。取消注释 “outDir”: “./js”,，这就是输出js文件所要存放的地址，这里我改写了在项目文件夹下的js文件夹。
{ “compilerOptions”: { /* Basic Options / // “incremental”: true, / Enable incremental compilation / “target”: “es5”, / Specify ECMAScript target version: ‘ES3’ (default), ‘ES5’, ‘ES2015’, ‘ES2016’, ‘ES2017’, ‘ES2018’, ‘ES2019’, ‘ES2020’, or ‘ESNEXT’. / “module”: “commonjs”, / Specify module code generation: ‘none’, ‘commonjs’, ‘amd’, ‘system’, ‘umd’, ‘es2015’, ‘es2020’, or ‘ESNext’. / // “lib”: [], / Specify library files to be included in the compilation. / // “allowJs”: true, / Allow javascript files to be compiled. / // “checkJs”: true, / Report errors in .js files. / // “jsx”: “preserve”, / Specify JSX code generation: ‘preserve’, ‘react-native’, or ‘react’. / // “declaration”: true, / Generates corresponding ‘.d.ts’ file. / // “declarationMap”: true, / Generates a sourcemap for each corresponding ‘.d.ts’ file. / // “sourceMap”: true, / Generates corresponding ‘.map’ file. / // “outFile”: “./”, / Concatenate and emit output to single file. / “outDir”: “./js”, / Redirect output structure to the directory. / // “rootDir”: “./”, / Specify the root directory of input files. Use to control the output directory structure with --outDir. / // “composite”: true, / Enable project compilation / // “tsBuildInfoFile”: “./”, / Specify file to store incremental compilation information / // “removeComments”: true, / Do not emit comments to output. / // “noEmit”: true, / Do not emit outputs. / // “importHelpers”: true, / Import emit helpers from ‘tslib’. / // “downlevelIteration”: true, / Provide full support for iterables in ‘for-of’, spread, and destructuring when targeting ‘ES5’ or ‘ES3’. / // “isolatedModules”: true, / Transpile each file as a separate module (similar to ‘ts.transpileModule’). */
/* Strict Type-Checking Options */
"strict": true, /* Enable all strict type-checking options. */
// "noImplicitAny": true, /* Raise error on expressions and declarations with an implied 'any' type. */
// "strictNullChecks": true, /* Enable strict null checks. */
// "strictFunctionTypes": true, /* Enable strict checking of function types. */
// "strictBindCallApply": true, /* Enable strict 'bind', 'call', and 'apply' methods on functions. */
// "strictPropertyInitialization": true, /* Enable strict checking of property initialization in classes. */
// "noImplicitThis": true, /* Raise error on 'this' expressions with an implied 'any' type. */
// "alwaysStrict": true, /* Parse in strict mode and emit "use strict" for each source file. */
/* Additional Checks */
// "noUnusedLocals": true, /* Report errors on unused locals. */
// "noUnusedParameters": true, /* Report errors on unused parameters. */
// "noImplicitReturns": true, /* Report error when not all code paths in function return a value. */
// "noFallthroughCasesInSwitch": true, /* Report errors for fallthrough cases in switch statement. */
/* Module Resolution Options */
// "moduleResolution": "node", /* Specify module resolution strategy: 'node' (Node.js) or 'classic' (TypeScript pre-1.6). */
// "baseUrl": "./", /* Base directory to resolve non-absolute module names. */
// "paths": {}, /* A series of entries which re-map imports to lookup locations relative to the 'baseUrl'. */
// "rootDirs": [], /* List of root folders whose combined content represents the structure of the project at runtime. */
// "typeRoots": [], /* List of folders to include type definitions from. */
// "types": [], /* Type declaration files to be included in compilation. */
// "allowSyntheticDefaultImports": true, /* Allow default imports from modules with no default export. This does not affect code emit, just typechecking. */
"esModuleInterop": true, /* Enables emit interoperability between CommonJS and ES Modules via creation of namespace objects for all imports. Implies 'allowSyntheticDefaultImports'. */
// "preserveSymlinks": true, /* Do not resolve the real path of symlinks. */
// "allowUmdGlobalAccess": true, /* Allow accessing UMD globals from modules. */
/* Source Map Options */
// "sourceRoot": "", /* Specify the location where debugger should locate TypeScript files instead of source locations. */
// "mapRoot": "", /* Specify the location where debugger should locate map files instead of generated locations. */
// "inlineSourceMap": true, /* Emit a single file with source maps instead of having a separate file. */
// "inlineSources": true, /* Emit the source alongside the sourcemaps within a single file; requires '--inlineSourceMap' or '--sourceMap' to be set. */
/* Experimental Options */
// "experimentalDecorators": true, /* Enables experimental support for ES7 decorators. */
// "emitDecoratorMetadata": true, /* Enables experimental support for emitting type metadata for decorators. */
/* Advanced Options */
"forceConsistentCasingInFileNames": true /* Disallow inconsistently-cased references to the same file. */更多内容请见原文，原文转载自：https://blog.csdn.net/weixin_44519496/article/details/119945555
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