通用編碼標準 JavaScript。

   // Good
   const userAge = 25;
   function calculateTotalPrice(items) { ... }

   // Bad
   const a = 25;
   function calc(items) { ... }

   const userAge = 25;
   function calculateTotalPrice(items) { ... }
   class UserProfile { ... }

   // Good
   function calculateDiscount(price, discount) { ... }
   const price1 = calculateDiscount(100, 10);
   const price2 = calculateDiscount(200, 20);

   // Bad
   const price1 = 100 - 10;
   const price2 = 200 - 20;

   async function fetchData() {
     try {
       const response = await fetch('api/url');
       const data = await response.json();
       return data;
     } catch (error) {
       console.error('Error fetching data:', error);
     }
   }

   function getUserAge(user) {
     if (!user || !user.age) {
       return 'Age not available';
     }
     return user.age;
   }

   if (condition) {
     doSomething();
   } else {
     doSomethingElse();
   }

   // utils.js
   export function calculateDiscount(price, discount) { ... }

   // main.js
   import { calculateDiscount } from './utils.js';

   // ui.js
   function updateUI(data) { ... }

   // data.js
   async function fetchData() { ... }

   // main.js
   import { updateUI } from './ui.js';
   import { fetchData } from './data.js';

   'use strict';

   const MAX_USERS = 100;

   // Good
   (function() {
     const localVariable = 'This is local';
   })();

   // Bad
   var globalVariable = 'This is global';

   /**
    * Calculates the total price after applying a discount.
    * @param {number} price - The original price.
    * @param {number} discount - The discount to apply.
    * @returns {number} - The total price after discount.
    */
   function calculateTotalPrice(price, discount) { ... }

   // Good
   async function fetchData() {
     try {
       const response = await fetch('api/url');
       const data = await response.json();
       return data;
     } catch (error) {
       console.error('Error fetching data:', error);
     }
   }

   // Bad
   function fetchData(callback) {
     fetch('api/url')
       .then(response => response.json())
       .then(data => callback(data))
       .catch(error => console.error('Error fetching data:', error));
   }

   // Good
   const vehicle = { make: 'Toyota', model: 'Camry' };
   const { make, model } = vehicle;

   // Bad
   const vehicleMake = vehicle.make;
   const vehicleModel = vehicle.model;