node.js学习笔记

吉米多维奇2024-05-14 13:32

读取命令行参数

安转minimist（轻量级的命令行参数解析引擎）

npm install --save minimist
js文件

javascript 复制代码

const minimist =require("minimist");

const args = minimist(process.argv.slice(2));

console.log(args["id"])

package.json

javascript 复制代码

{
    "name": "nodejs",
    "version": "1.0.0",
    "description": "",
    "main": "index.js",
    "scripts": {
        "dev": "node index.js --id=10",
        "test": "echo \"Error: no test specified\" && exit 1"
    },
    "keywords": [],
    "author": "",
    "license": "ISC",
    "dependencies": {
        "@types/node": "^18.0.6",
        "minimist": "^1.2.8",
        "node-fetch": "^3.2.6"
    }
}

运行结果

读取package.json文件内容

javascript 复制代码

const fs=require("fs");

const packageJsonData = JSON.parse(fs.readFileSync("package.json", "utf8"));

console.log(packageJsonData);

退出进程

javascript 复制代码

process.exit();

使用虚拟dom获取元素

javascript 复制代码

npm install --save jsdom

javascript 复制代码

const jsdom = require("jsdom");
const { JSDOM } = jsdom;

const dom = new JSDOM(`<!DOCTYPE html><p>Hello world</p>`);
console.log(dom.window.document.querySelector("p").textContent); // "Hello world"

处理接口跨域

javascript 复制代码

res.setHeader("Access-Control-Allow-Origin", "*");