TRY CODING FUN

add[1] + 1 // 2
add[1][2][3] + 4 // 10
add[10][-5][3][100] * 2 // 216

import { StrictMode } from "react";
import { createRoot } from "react-dom/client";

import App from "./App";

const rootElement = document.getElementById("root");
const root = createRoot(rootElement);

root.render(
  <StrictMode>
    <App />
  </StrictMode>
);

import { useState, useCallback, useEffect, useMemo, useRef } from "react";
import "./styles.css";

export default function App() {
  const phase = useRef("idle");
  const base = useRef();
  const [btnText, setBtnText] = useState("Start");
  const [accTime, setAccTime] = useState(0);
  const [elsTime, setElsTime] = useState(0);

  const time = useMemo(() => accTime + elsTime, [accTime, elsTime]);

  useEffect(() => {
    let stopped = false;

    (function tick() {
      if ("running" === phase.current) {
        setElsTime(performance.now() - base.current);
      }
      !stopped && requestAnimationFrame(tick);
    })();

    return () => (stopped = true);
  }, []);

  const onClickButton = useCallback(() => {
    phase.current = {
      idle: "running",
      paused: "running",
      running: "paused"
    }[phase.current];

    setBtnText(
      {
        idle: "Start",
        paused: "Resume",
        running: "Pause"
      }[phase.current]
    );

    if ("running" === phase.current) {
      base.current = performance.now();
    } else if ("paused" === phase.current) {
      setAccTime(time);
      setElsTime(0);
    }
  }, [time]);

  return (
    <div className="App">
      <h1>{(time * 1e-3).toFixed(3)}</h1>
      <button onClick={onClickButton}>{btnText}</button>
    </div>
  );
}

var sequelize = new Sequelize('database', 'username', 'password', {
  dialect: 'mysql',
  host: 'localhost',
  port: 3306,
  logQueryParameters: true,
  logging: true
});

const complete = this._logQuery(sql, debug, parameters);

_logQuery(sql, debugContext, parameters) {
  const { connection, options } = this;
  const benchmark = this.sequelize.options.benchmark || options.benchmark;
  const logQueryParameters = this.sequelize.options.logQueryParameters || options.logQueryParameters;
  const startTime = Date.now();
  let logParameter = '';

  if (logQueryParameters && parameters) {
    const delimiter = sql.endsWith(';') ? '' : ';';

    logParameter = `${delimiter} with parameters ${NodeUtil.inspect(parameters)}`;
  }

  const fmt = `(${connection.uuid || 'default'}): ${sql}${logParameter}`;
  const queryLabel = options.queryLabel ? `${options.queryLabel}\n` : '';
  const msg = `${queryLabel}Executing ${fmt}`;
  debugContext(msg);
  if (!benchmark) {
    this.sequelize.log(`${queryLabel}Executing ${fmt}`, options);
  }

  return () => {
    const afterMsg = `${queryLabel}Executed ${fmt}`;
    debugContext(afterMsg);
    if (benchmark) {
      this.sequelize.log(afterMsg, Date.now() - startTime, options);
    }
  };
}

const [rows, fields] = await connection.execute(
  'SELECT * FROM `table` WHERE `name` = ? AND `age` > ?',
  ['Morty', 14]
);

const mysql = require('mysql2');

const connection = mysql.createConnection({
  host: 'your_mysql_host',
  user: 'your_mysql_username',
  password: 'your_mysql_password',
  database: 'your_mysql_database',
});

const sql = 'SELECT * FROM your_table WHERE column = ?';
const values = ['some_value'];

connection.execute(sql, values, (err, results) => {
  if (err) {
    console.error('Error executing query:', err.message);
    return;
  }

  console.log('Query:', connection.format(sql, values)); // 打印查询语句
  console.log('Results:', results);
});

connection.end();

// webpack.config.js
const path = require('path')

module.exports = {
  resolve: {
    alias: {
      '@': path.resolve(__dirname, 'src')
    }
  }
}

import { a } from '@/a.js'