deno入门教程

# Shell (Mac, Linux):
$ curl -fsSL https://deno.land/install.sh | sh

# PowerShell (Windows):
$ iwr https://deno.land/install.ps1 -useb | iex

# Homebrew (Mac):
$ brew install deno

# Chocolatey (Windows):
$ choco install deno

# Scoop (Windows):
$ scoop install deno

# Build and install from source using Cargo:
$ cargo install deno --locked

export DENO_INSTALL="/Users/wmq/.deno" 
export PATH="$DENO_INSTALL/bin:$PATH"

export function add(a: number, b: number): number {
    return a + b;
}

// Learn more at https://deno.land/manual/examples/module_metadata#concepts
if (import.meta.main) {
    console.log("Add 2 + 3 =", add(2, 3));
}

console.log('hello world')

Usage: deno [OPTIONS] [COMMAND]

Commands:
  run          Run a JavaScript or TypeScript program
  bench        Run benchmarks
  bundle       Bundle module and dependencies into single file
  cache        Cache the dependencies
  check        Type-check the dependencies
  compile      Compile the script into a self contained executable
  completions  Generate shell completions
  coverage     Print coverage reports
  doc          Show documentation for a module
  eval         Eval script
  fmt          Format source files
  init         Initialize a new project
  info         Show info about cache or info related to source file
  install      Install script as an executable
  jupyter      Deno kernel for Jupyter notebooks
  uninstall    Uninstall a script previously installed with deno install
  lsp          Start the language server
  lint         Lint source files
  repl         Read Eval Print Loop
  task         Run a task defined in the configuration file
  test         Run tests
  types        Print runtime TypeScript declarations
  upgrade      Upgrade deno executable to given version
  vendor       Vendor remote modules into a local directory
  help         Print this message or the help of the given subcommand(s)

Options:
      --unstable
          Enable unstable features and APIs
      --unstable-bare-node-builtins
          Enable unstable bare node builtins feature [env:
          DENO_UNSTABLE_BARE_NODE_BUILTINS=]
      --unstable-byonm
          Enable unstable 'bring your own node_modules' feature [env:
          DENO_UNSTABLE_BYONM=]
      --unstable-broadcast-channel
          Enable unstable `BroadcastChannel` API
      --unstable-ffi
          Enable unstable FFI APIs
      --unstable-fs
          Enable unstable file system APIs
      --unstable-kv
          Enable unstable Key-Value store APIs
      --unstable-net
          Enable unstable net APIs
      --unstable-http
          Enable unstable HTTP APIs
      --unstable-worker-options
          Enable unstable Web Worker APIs
      --unstable-cron
          Enable unstable Deno.cron API
  -q, --quiet
          Suppress diagnostic output
  -h, --help
          Print help (see more with '--help')
  -V, --version
          Print version

ENVIRONMENT VARIABLES:
    DENO_AUTH_TOKENS     A semi-colon separated list of bearer tokens and
                         hostnames to use when fetching remote modules from
                         private repositories
                         (e.g. "abcde12345@deno.land;54321edcba@github.com")
    DENO_TLS_CA_STORE    Comma-separated list of order dependent certificate
                         stores. Possible values: "system", "mozilla".
                         Defaults to "mozilla".
    DENO_CERT            Load certificate authority from PEM encoded file
    DENO_DIR             Set the cache directory
    DENO_INSTALL_ROOT    Set deno install's output directory
                         (defaults to $HOME/.deno/bin)
    DENO_REPL_HISTORY    Set REPL history file path
                         History file is disabled when the value is empty
                         (defaults to $DENO_DIR/deno_history.txt)
    DENO_NO_PACKAGE_JSON Disables auto-resolution of package.json
    DENO_NO_PROMPT       Set to disable permission prompts on access
                         (alternative to passing --no-prompt on invocation)
    DENO_NO_UPDATE_CHECK Set to disable checking if a newer Deno version is
                         available
    DENO_V8_FLAGS        Set V8 command line options
    DENO_JOBS            Number of parallel workers used for the --parallel
                         flag with the test subcommand. Defaults to number
                         of available CPUs.
    HTTP_PROXY           Proxy address for HTTP requests
                         (module downloads, fetch)
    HTTPS_PROXY          Proxy address for HTTPS requests
                         (module downloads, fetch)
    NPM_CONFIG_REGISTRY  URL to use for the npm registry.
    NO_COLOR             Set to disable color
    NO_PROXY             Comma-separated list of hosts which do not use a proxy
                         (module downloads, fetch)

$ deno run --allow-read=/usr https://deno.land/std/examples/cat.ts /etc/passwderror: Uncaught PermissionDenied: read access to "/etc/passwd", run again with the --allow-read flag► $deno$/dispatch_json.ts:40:11    at DenoError ($deno$/errors.ts:20:5)    ...

fetch.ts:const result = await fetch("https://deno.land/");

deno run --allow-net=github.com,deno.land fetch.ts

deno run --allow-net fetch.ts

$ deno init
✅ 项目已初始化
运行以下命令来开始

  // 运行程序
  deno run main.ts

  // 运行程序并监视文件更改
  deno task dev

  // 运行测试
  deno test

  // 运行基准测试
  deno bench

$ deno run main.ts
Add 2 + 3 = 5

$ deno test
检查文件:///dev/main_test.ts
main_test.ts 执行 1 个测试
addTest ... ok (6ms)

ok | 1 passed | 0 failed (29ms)

$ deno init my_deno_project
✅ 项目已初始化

运行以下命令来开始

  cd my_deno_project

  // 运行程序
  deno run main.ts

  // 运行程序并监视文件更改
  deno task dev

  // 运行测试
  deno test

  // 运行基准测试
  deno bench

export function add(a: number, b: number): number {
  return a + b;
}

// Learn more at https://deno.land/manual/examples/module_metadata#concepts
if (import.meta.main) {
  console.log("Add 2 + 3 =", add(2, 3));
}

import { someFunction } from './someModule.ts';

// someModule.ts
export function someFunction() {
  // ...
}

import { serve } from "https://deno.land/std/http/server.ts";

import { serve } from "./path/to/library.ts";

import { serve } from "https://deno.land/std@0.100.0/http/server.ts";

{
  "imports": {
    "lodash": "https://cdn.skypack.dev/lodash"
  }
}

import _ from "lodash";

{
  "name": "my-deno-project",
  "main": "main.ts",
  "scripts": {
    "start": "deno run main.ts"
  },
  "dependencies": {
    "lodash": "4.17.21"
  },
  "importmap": "import_map.json",
  "permissions": {
    "net": true,
    "read": true
  }
}