通用编码标准 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(null, 10);
   const price2 = calculatediscount(null, 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;