// test/promise_wait.js
function test() {
  return axios.get(
    "https://httpbin.org/get"
  ).then(res=>{
    console.info("返回了数据")
    console.info(res.data)
    return res.data
  })
}
async function await_promise() {
  let prom = test()
  await prom
  console.info("请求执行完毕, 我才会输出, 但是需要用在async的函数里")
}
function main() {
  test().then(res=>{
    console.info("来了")
  })
  console.info("请求没执行完毕, 我会先输出")
}

Math.floor(null) = 0;
Math.floor(-5.05) = -6;

var quotient = Math.floor(y/x);
var remainder = y % x;

Number.isInteger(0.1)  // false
Number.isInteger("10")  // false
Number.isInteger([1])  // false
Number.isInteger(0)  // true

// 通过编号系统中的 nu 扩展键请求，例如：中文十进制数字
console.log(new Intl.NumberFormat("zh-Hans-CN-u-nu-hanidec").format(number));
// → 一二三,四五六.七八九

const obj1 = { foo: "bar", x: 42 };
const obj2 = { foo: "baz", y: 13 };

const mergedObj = { x: 41, ...obj1, ...obj2, y: 9 }; // { x: 42, foo: "baz", y: 9 }

    do {
    } whilte (condition);

const axios = require('axios');
axios.get(
  '/user', {
    params: {
      staff: true
    }
  })
  .then(function(response) {
  })
axios.post('/user', data)
    .then(function(response) {
    })
    .catch(function(error) {
    })

rules: {
  "indent": [
    "error", 2,  // 2缩进
    {
      "SwitchCase": 1  // switch内部也要缩进
    }
  ],
  "comma-dangle": ["error", "always-multiline"],  // 多行时最后要加逗号
  "no-debugger": "off",
  "no-unused-vars": "off",  // 开发时关闭，开发结束后打开
  "semi": "never",
}

const getFQDN = require('get-fqdn');
const fqdn = await getFQDN()
console.log(fqdn)  // windows.ramwin.com

const moment = require("moment")
var m = moment(new Date())
m.format("YYYY-MM-DD")  // 生成的是m的时区的日期. 通过m.utcOffset(0)可以修改时区. 默认为当前时区

<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.22.2/moment-with-locales.min.js"></script>
<script>
  var now = moment(new Date())
  console.log(now.format("YYYY-MM-DD"))
  console.log(now.add(12, 'days').calendar());
  moment("20111031", "YYYYMMDD")
</script>

let now = moment()
noe.hours(12).minutes(0).seconds(0)

moment().add(7, 'days')
moment().subtract(7, 'days')

moment().format()  //  "2014-09-08T08:02:17-05:00"
moment().format("YYYY-MM-DD HH:mm:ss") 

moment(moment.now() - moment.duration(2, 'hours'))
moment.substract(2, 'hours')  // 但是这样原来的时间就丢失了

import Papa from "papaparse"
Papa.parse(file|csvString|url, config: {}, complete: function(results) {})

{
  header: true,
}

const qs = require('qs')
qs.parse('a=c') == { a: 'c'}
qs.stringify({a: [1,2,3]}, {indices: false}) == 'a=1&a=2&a=3'

// animal.js
class Cat {
    constructor(name) {
        this.name = name
    }
    function say() {
        console.info(`miao: ${this.name}`)
    }
}
module.exports = {
    Cat
}
exports.Cat = Cat
exports.Cat = class Cat {...}
// run.js
const animal = require('./animal.js')
var cat =animal.Cat('kitty')
cat.say()

Cat.vue
export default {
}
import Cat from "./Cat"

npm config set registry https://registry.npm.taobao.org
npm config set registry https://registry.npmjs.org/

npm install --save  // 以前的npm需要用save来自动修改package.json. 现在不需要这个参数了
npm install ramwin@latest // 升级
npm install -P|--save-prod  # 添加到dependencies
npm install -D|--save-dev  # 添加到devDependencies
npm install webpack@^5
npm uninstall <package>

npm publich  # 发布版本

npm-link-better vue