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Разработка core сервисов и утилит в Angular 18

Sep 13, 2024 pm 10:19 PM

Разработка core сервисов и утилит в Angular 18

Core - это набор функций, конфигов и утилит, которые используются в приложении.

Обычно, core - то, что вы тащите из проекта в проект. В данном случае, я пытался взять только необходимое.

Коротко о всем core:

  • api/params.ts — утилита для приведения параметров. Например, в query params есть baggage=true, а нужно чтобы true был не string, а boolean;
  • currency/currency.ts — конфиг валюты;
  • env/environment.ts — получение и использование .env;
  • form/form.ts — немного типизации FormGroup;
  • form/extract-changes.directive.ts — директива обнаружения изменений в FormControl;
  • hammer/hammer.ts — настройка hammerjs;
  • interceptors/content-type.interceptor.ts — опредение Content-Type для HTTP запросов;
  • metrics — сервис отрпавки событий в google analytics и yandex metrika;
  • navigation/mavigation.ts — реализация путей в приложении;
  • styles/extra-class.service.ts — мой велосипед для навешивания классов;
  • types/type.ts — кастомные типов;
  • utils — утилиты работы с датами и сроками.

Особого внимания заслуживает только навигация.

Управление навигацией в приложении

Рассмотрим более детально реализацию управлением навигации.

Допустим у нас имеются роуты всего приложения:

export const PATHS = {
  home: '',
  homeAvia: '',
  homeHotels: 'hotels',
  homeTours: 'tours',
  homeRailways: 'railways',

  rules: 'rules',
  terms: 'terms',
  documents: 'documents',
  faq: 'faq',
  cards: 'cards',
  login: 'login',
  registration: 'registration',

  notFound: 'not-found',
  serverError: 'server-error',
  permissionDenied: 'permission-denied',

  search: 'search',
  searchAvia: 'search/avia',
  searchHotel: 'search/hotels',
  searchTour: 'search/tours',
  searchRailway: 'search/railways',
} as const;
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PathValues - тип, который будет представлять набор строк.

export type PathValues = (typeof PATHS)[keyof typeof PATHS];

type Filter<T extends string> = T extends `:${infer Param}` ? Param : never;

type Split<Value extends string> = Value extends `${infer LValue}/${infer RValue}` ? Filter<LValue> | Split<RValue> : Filter<Value>;

export type GetPathParams<T extends string> = {
  [key in Split<T>]: string | number;
};

export interface NavigationLink<T extends PathValues = PathValues> {
  readonly label: string;
  readonly route: T;
  readonly params?: GetPathParams<T>;
  readonly suffix?: string;
}
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NavigationLink — интерфейс массива ссылок.

getRoute разбивает строку с параметрами и заменяет найденные ключи на переданные значения:

export function getRoute<T extends PathValues>(path: T, params: Record<string, string | number> = {}): (string | number)[] {
  const segments = path.split('/').filter((value) => value?.length);
  const routeWithParams: (string | number)[] = ['/'];

  for (const segment of segments) {
    if (segment.charAt(0) === ':') {
      const paramName = segment.slice(1);
      if (params && params[paramName]) {
        routeWithParams.push(params[paramName]);
      } else {
        routeWithParams.push(paramName);
      }
    } else {
      routeWithParams.push(segment);
    }
  }

  return routeWithParams;
}
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Последние функции для "костылирования" путей в роутах приложения:

export function getChildPath(path: PathValues, parent: PathValues): string {
  return path.substring(parent.length + 1);
}

export function childNavigation(route: NavigationChild, parent: PathValues): Route {
  const redirectTo = route.redirectTo ? `/${route.redirectTo}` : undefined;

  if (!route.path.length || route.path.length < parent.length + 1) {
    return { ...route, redirectTo };
  }

  return {
    ...route,
    redirectTo,
    path: getChildPath(route.path, parent),
  };
}

export function withChildNavigation(parent: PathValues): (route: NavigationChild) => Route {
  return (route: NavigationChild) => childNavigation(route, parent);
}
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Пример использования. В app.routes:

export const routes: Routes = [
  {
    path: '',
    loadComponent: () => import('@baf/ui/layout').then((m) => m.LayoutComponent),
    children: [
      {
        path: PATHS.search,
        loadChildren: () => import('./routes/search.routes').then((m) => m.searchRoutes),
      },
    ],
  },
];
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В routes/search.routes.ts:

import { Routes } from '@angular/router';
import { PATHS, withChildNavigation } from '@baf/core';

export const searchRoutes: Routes = [
  {
    path: PATHS.searchAvia,
    title: $localize`:Search Page:Search for cheap flights`,
    loadComponent: () => import('@baf/search/page').then((m) => m.SearchPageComponent),
  },
].map(withChildNavigation(PATHS.search));
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Аналитика

Сервис отрпавки событий в google analytics и yandex metrika - metrics:

import { InjectionToken } from '@angular/core';

export interface MetricConfig {
  readonly ids?: string[];
  readonly counter?: number;
  readonly domains: string[];
  readonly paths: string[];
}

export const METRIC_CONFIG = new InjectionToken<MetricConfig>('MetricConfig');
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MetricConfig - конфигурация метрик google и yandeх:

  • ids - список Google IDS;
  • counter - счетчик yandex metrika;
  • domains - список доменов для объединения сессий аналитики;
  • paths - набор путей, когда должны быть сброшены referrer'ы.

Общий сервис для отправки событий:

import { inject, Injectable } from '@angular/core';
import { takeUntilDestroyed } from '@angular/core/rxjs-interop';
import { NavigationEnd, Router } from '@angular/router';
import { filter } from 'rxjs';
import { tap } from 'rxjs/operators';

import { GoogleAnalytics } from './google-analytics';
import { YandexMetrika } from './yandex.metrika';

export interface MetricOptions {
  readonly [key: string]: unknown;

  readonly ym?: Record<string, unknown>;
  readonly ga?: Record<string, unknown>;
}

export function extractOptions(options?: MetricOptions): { readonly ym?: Record<string, unknown>; readonly ga?: Record<string, unknown> } {
  let { ym, ga } = options ?? {};

  if (options) {
    if (!ym && !ga) {
      ym = options;
      ga = options;
    }
  }

  return { ym, ga };
}

@Injectable()
export class MetricService {
  private readonly router = inject(Router);
  private readonly yandexMetrika = inject(YandexMetrika);
  private readonly googleAnalytics = inject(GoogleAnalytics);

  constructor() {
    this.router.events
      .pipe(
        filter((event): event is NavigationEnd => event instanceof NavigationEnd),
        tap((event) => this.navigation(event.urlAfterRedirects)),
        takeUntilDestroyed(),
      )
      .subscribe();
  }

  init(customerId?: string | number) {
    this.set({
      ga: customerId ? { user_id: customerId } : undefined,
      ym: customerId ? { UserID: customerId } : undefined,
    });
  }

  navigation(url: string): void {
    this.googleAnalytics.sendNavigation(url);
    this.yandexMetrika.hit(url);
  }

  send(action: string, options?: MetricOptions): void {
    const params = extractOptions(options);

    this.googleAnalytics.sendEvent(action, params.ga);
    this.yandexMetrika.reachGoal(action, params.ym);
  }

  set(options: MetricOptions): void {
    const params = extractOptions(options);

    if (params.ga) {
      this.googleAnalytics.set(params.ga);
    }
    if (params.ym) {
      this.yandexMetrika.set(params.ym);
    }
  }
}
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Методы сервиса:

  • init - инициализация счетчиков;
  • navigation - отправка события перехода на страницу;
  • send - регистрация event;
  • set - передача параметров в аналитику.

Реализация сервиса гугл аналитики:

import { DOCUMENT, isPlatformBrowser } from '@angular/common';
import { inject, Injectable, PLATFORM_ID } from '@angular/core';
import { Title } from '@angular/platform-browser';

import { METRIC_CONFIG } from './metrica.interface';

declare global {
  interface Window {
    readonly gtag?: (...params: unknown[]) => void;
  }
}

@Injectable()
export class GoogleAnalytics {
  private readonly isBrowser = isPlatformBrowser(inject(PLATFORM_ID));
  private readonly document = inject(DOCUMENT);
  private readonly config = inject(METRIC_CONFIG);
  private readonly title = inject(Title);

  readonly gtag: (...params: unknown[]) => void;

  constructor() {
    if (this.isBrowser && typeof this.document.defaultView?.gtag !== 'undefined' && this.config.ids && this.config.ids?.length > 0) {
      this.gtag = this.document.defaultView.gtag;
    } else {
      this.gtag = () => {};
    }
  }

  set(payload: Record<string, unknown>): void {
    this.gtag('set', payload);
  }

  sendEvent(action: string, payload?: Record<string, unknown>): void {
    this.gtag('event', action, {
      ...payload,
      event_category: payload?.['eventCategory'],
      event_label: payload?.['eventLabel'],
      value: payload?.['eventValue'],
    });
  }

  sendNavigation(url: string): void {
    if (
      (this.isBrowser && !this.config.domains.every((domain) => this.document.referrer.indexOf(domain) < 0)) ||
      !this.config.paths.every((path) => this.document.location.pathname.indexOf(path) < 0)
    ) {
      this.set({ page_referrer: this.document.defaultView?.location.origin ?? '' });
    }

    if (this.config.ids) {
      for (const key of this.config.ids) {
        this.gtag('config', key, {
          page_title: this.title.getTitle(),
          page_path: url,
        });
      }
    }
  }
}
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Яндекс метрика:

import { DOCUMENT, isPlatformBrowser } from '@angular/common';
import { inject, Injectable, PLATFORM_ID } from '@angular/core';

import { METRIC_CONFIG } from './metrica.interface';

declare global {
  interface Window {
    readonly ym?: (...params: unknown[]) => void;
  }
}

@Injectable()
export class YandexMetrika {
  private readonly document = inject(DOCUMENT);
  private readonly isBrowser = isPlatformBrowser(inject(PLATFORM_ID));
  private readonly config = inject(METRIC_CONFIG);

  private readonly counter: (...params: unknown[]) => void;

  constructor() {
    if (this.isBrowser && typeof this.document.defaultView?.ym !== 'undefined' && !!this.config.counter) {
      this.counter = this.document.defaultView.ym;
    } else {
      this.counter = () => {};
    }
  }

  hit(url: string, options?: Record<string, unknown>): void {
    let clearReferrer = false;
    if (
      (this.isBrowser && !this.config.domains.every((domain) => this.document.referrer.indexOf(domain) < 0)) ||
      !this.config.paths.every((path) => this.document.location.pathname.indexOf(path) < 0)
    ) {
      clearReferrer = true;
    }

    const optionsAll: { referer?: string } = { ...options };
    if (clearReferrer) {
      optionsAll.referer = '';
    }
    this.counter(this.config.counter, 'hit', url, optionsAll);
  }

  reachGoal(target: string, options?: Record<string, unknown>): void {
    this.counter(this.config.counter, 'reachGoal', target, options);
  }

  set(params: Record<string, unknown>, options?: Record<string, unknown>): void {
    this.counter(this.config.counter, 'userParams', params, options);
  }
}
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Core

Утилита для каста параметров запроса - api/params.ts:

export type HttpParams = Record<string, string | number | boolean | ReadonlyArray<string | number | boolean>>;

export function castParams(all: Record<string, unknown>): HttpParams {
  const params: HttpParams = {};

  for (const [key, value] of Object.entries(all)) {
    if (Array.isArray(value) && value.length > 0) {
      params[key] = value.filter((val) => {
        return typeof val === 'string' || typeof val === 'boolean' || typeof val === 'number';
      });
    } else if (typeof value === 'string' || typeof value === 'boolean' || typeof value === 'number') {
      params[key] = value;
    }
  }

  return params;
}
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Установка валюты - currency/currency.ts:

import { DEFAULT_CURRENCY_CODE, Provider } from '@angular/core';

export function provideCurrency(currencyCode: string): Provider {
  return {
    provide: DEFAULT_CURRENCY_CODE,
    useValue: currencyCode,
  };
}
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Получение и использование переменных окружения - env/environment.ts:

import type { ApplicationConfig} from '@angular/core';
import { APP_INITIALIZER, makeStateKey, TransferState } from '@angular/core';

export const ENV_KEY = makeStateKey<Environment>('Environment');

export interface Environment {
  readonly aviasalesToken: string;
  readonly hotellookToken: string;
}

export const ENV_DEFAULT: Environment = {
  aviasalesToken: '',
  hotellookToken: '',
};

export function provideEnv() {
  return [
    {
      provide: APP_INITIALIZER,
      useFactory: (transferState: TransferState) => {
        return () => {
          transferState.set<Environment>(ENV_KEY, {
            aviasalesToken: process.env['AVIASALES_TOKEN'] ?? ENV_DEFAULT.aviasalesToken,
            hotellookToken: process.env['HOTELLOOK_TOKEN'] ?? ENV_DEFAULT.hotellookToken,
          });
        };
      },
      deps: [TransferState],
      multi: true,
    },
  ];
}

export const envConfig: ApplicationConfig = {
  providers: [provideEnv()],
};
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Типизация форм - form/form.ts:

import type { FormControl, FormGroup } from '@angular/forms';

export type FormFor<T> = {
  [P in keyof T]: FormControl<T[P]>;
};

export type FormWithSubFor<T> = {
  [P in keyof T]: T[P] extends Record<string, unknown> ? FormGroup<FormFor<T[P]>> : FormControl<T[P]>;
};

export function castQueryParams(queryParams: Record<string, unknown>, props?: string[]): Record<string, unknown> {
  const mapped: Record<string, unknown> = {};

  const keys = props ?? Object.keys(queryParams);

  for (const key of keys) {
    const value = queryParams[key];

    if (typeof value === 'string' && value.length > 0) {
      if (['true', 'false'].includes(value)) {
        mapped[key] = value === 'true';
      } else if (!isNaN(Number(value))) {
        mapped[key] = Number(value);
      } else {
        mapped[key] = value;
      }
    } else if (typeof value === 'boolean') {
      mapped[key] = value;
    } else if (typeof value === 'number' && value > 0) {
      mapped[key] = value;
    }
  }

  return mapped;
}
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Директива обнаружения изменений в FormControl:

import type { FormControl, FormGroup } from '@angular/forms';

export type FormFor<T> = {
  [P in keyof T]: FormControl<T[P]>;
};

export type FormWithSubFor<T> = {
  [P in keyof T]: T[P] extends Record<string, unknown> ? FormGroup<FormFor<T[P]>> : FormControl<T[P]>;
};

export function castQueryParams(queryParams: Record<string, unknown>, props?: string[]): Record<string, unknown> {
  const mapped: Record<string, unknown> = {};

  const keys = props ?? Object.keys(queryParams);

  for (const key of keys) {
    const value = queryParams[key];

    if (typeof value === 'string' && value.length > 0) {
      if (['true', 'false'].includes(value)) {
        mapped[key] = value === 'true';
      } else if (!isNaN(Number(value))) {
        mapped[key] = Number(value);
      } else {
        mapped[key] = value;
      }
    } else if (typeof value === 'boolean') {
      mapped[key] = value;
    } else if (typeof value === 'number' && value > 0) {
      mapped[key] = value;
    }
  }

  return mapped;
}
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Настройка hammerjs:

import type { EnvironmentProviders, Provider } from '@angular/core';
import { importProvidersFrom, Injectable } from '@angular/core';
import { HAMMER_GESTURE_CONFIG, HammerGestureConfig, HammerModule } from '@angular/platform-browser';

@Injectable()
export class HammerConfig extends HammerGestureConfig {
  override overrides = {
    swipe: { velocity: 0.4, threshold: 20 },
    pinch: { enable: false },
    rotate: { enable: false },
  };
}

export function provideHammer(): (Provider | EnvironmentProviders)[] {
  return [
    importProvidersFrom(HammerModule),
    {
      provide: HAMMER_GESTURE_CONFIG,
      useClass: HammerConfig,
    },
  ];
}
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Установка Content-Type для HTTP запросов -interceptors/content-type.interceptor.ts:

import type { HttpInterceptorFn } from '@angular/common/http';

export const contentTypeInterceptor: HttpInterceptorFn = (req, next) => {
  if (!req.headers.has('Content-Type') && req.headers.get('enctype') !== 'multipart/form-data') {
    req = req.clone({ headers: req.headers.set('Content-Type', 'application/json') });
  }

  return next(req);
};
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Сервис для добавления классов компонентам и директивам - styles/extra-class.service.ts:

import { DestroyRef, ElementRef, inject, Injectable, Renderer2 } from '@angular/core';
import { takeUntilDestroyed } from '@angular/core/rxjs-interop';
import type { Observable, Subscription } from 'rxjs';
import { tap } from 'rxjs';

type Styles = string | string[] | undefined | null;

export function toClass(value: unknown | undefined | null, prefix = 'is'): Styles {
  return value ? `${prefix}-${value}` : undefined;
}

@Injectable()
export class ExtraClassService {
  private readonly destroyRef = inject(DestroyRef);
  private readonly render = inject(Renderer2);
  private readonly elementRef: ElementRef<HTMLElement> = inject(ElementRef);

  private styles: Record<string, Styles> = {};
  private subscriptions: Record<string, Subscription> = {};

  update(key: string, styles: Styles): void {
    if (this.styles[key]) {
      const lastStyles = this.styles[key];
      if (Array.isArray(lastStyles)) {
        lastStyles.map((style) => this.render.removeClass(this.elementRef.nativeElement, style));
      } else if (lastStyles) {
        this.render.removeClass(this.elementRef.nativeElement, lastStyles);
      }
    }
    if (Array.isArray(styles)) {
      styles.map((style) => this.render.addClass(this.elementRef.nativeElement, style));
    } else if (styles) {
      this.render.addClass(this.elementRef.nativeElement, styles);
    }
    this.styles[key] = styles;
  }

  patch(style: string, active: boolean): void {
    if (active) {
      this.render.addClass(this.elementRef.nativeElement, style);
    } else {
      this.render.removeClass(this.elementRef.nativeElement, style);
    }
  }

  register(key: string, observable: Observable<unknown>, callback: () => void, start = true): void {
    if (this.subscriptions[key]) {
      this.unregister(key);
    }
    if (start) {
      callback();
    }
    this.subscriptions[key] = observable
      .pipe(
        tap(() => callback()),
        takeUntilDestroyed(this.destroyRef),
      )
      .subscribe();
  }

  unregister(key: string): void {
    this.subscriptions[key].unsubscribe();
  }
}
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Кастомные типы - types/type.ts:

export type ChangeFn = (value: any) => void;

export type TouchedFn = () => void;

export type DisplayFn = (value: any, index?: number) => string;

export type MaskFn = (value: any) => string;

export type StyleFn = (value?: any) => string | string[];

export type CoerceBoolean = boolean | string | undefined | null;
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Утилиты работы с датами и сроками - utils:

export function getDaysBetweenDates(startDate: Date | string, endDate: Date | string): number {
  return Math.round((new Date(endDate).getTime() - new Date(startDate).getTime()) / 86400000);
}
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Короткая реализация для uuid:

export function uuidv4(): string {
  return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, (c) => {
    const r = (Math.random() * 16) | 0;

    const v = c == 'x' ? r : (r & 0x3) | 0x8;

    return v.toString(16);
  });
}
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И функция для гуманизации:

export function camelCaseToHumanize(str: string): string {
  return str.replace(/[A-Z]/g, (m) => '-' + m.toLowerCase());
}
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В следующей статье будем разрабатывать свой UI KIT.

Ссылки

Все исходники находятся на github, в репозитории - github.com/Fafnur/buy-and-fly

Демо можно посмотреть здесь - buy-and-fly.fafn.ru/

Мои группы: telegram, medium, vk, x.com, linkedin, site

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Python更适合初学者,学习曲线平缓,语法简洁;JavaScript适合前端开发,学习曲线较陡,语法灵活。1.Python语法直观,适用于数据科学和后端开发。2.JavaScript灵活,广泛用于前端和服务器端编程。

JavaScript和Web:核心功能和用例 JavaScript和Web:核心功能和用例 Apr 18, 2025 am 12:19 AM

JavaScript在Web开发中的主要用途包括客户端交互、表单验证和异步通信。1)通过DOM操作实现动态内容更新和用户交互;2)在用户提交数据前进行客户端验证,提高用户体验;3)通过AJAX技术实现与服务器的无刷新通信。

JavaScript在行动中:现实世界中的示例和项目 JavaScript在行动中:现实世界中的示例和项目 Apr 19, 2025 am 12:13 AM

JavaScript在现实世界中的应用包括前端和后端开发。1)通过构建TODO列表应用展示前端应用,涉及DOM操作和事件处理。2)通过Node.js和Express构建RESTfulAPI展示后端应用。

了解JavaScript引擎:实施详细信息 了解JavaScript引擎:实施详细信息 Apr 17, 2025 am 12:05 AM

理解JavaScript引擎内部工作原理对开发者重要,因为它能帮助编写更高效的代码并理解性能瓶颈和优化策略。1)引擎的工作流程包括解析、编译和执行三个阶段;2)执行过程中,引擎会进行动态优化,如内联缓存和隐藏类;3)最佳实践包括避免全局变量、优化循环、使用const和let,以及避免过度使用闭包。

Python vs. JavaScript:社区,图书馆和资源 Python vs. JavaScript:社区,图书馆和资源 Apr 15, 2025 am 12:16 AM

Python和JavaScript在社区、库和资源方面的对比各有优劣。1)Python社区友好,适合初学者,但前端开发资源不如JavaScript丰富。2)Python在数据科学和机器学习库方面强大,JavaScript则在前端开发库和框架上更胜一筹。3)两者的学习资源都丰富,但Python适合从官方文档开始,JavaScript则以MDNWebDocs为佳。选择应基于项目需求和个人兴趣。

Python vs. JavaScript:开发环境和工具 Python vs. JavaScript:开发环境和工具 Apr 26, 2025 am 12:09 AM

Python和JavaScript在开发环境上的选择都很重要。1)Python的开发环境包括PyCharm、JupyterNotebook和Anaconda,适合数据科学和快速原型开发。2)JavaScript的开发环境包括Node.js、VSCode和Webpack,适用于前端和后端开发。根据项目需求选择合适的工具可以提高开发效率和项目成功率。

C/C在JavaScript口译员和编译器中的作用 C/C在JavaScript口译员和编译器中的作用 Apr 20, 2025 am 12:01 AM

C和C 在JavaScript引擎中扮演了至关重要的角色,主要用于实现解释器和JIT编译器。 1)C 用于解析JavaScript源码并生成抽象语法树。 2)C 负责生成和执行字节码。 3)C 实现JIT编译器,在运行时优化和编译热点代码,显着提高JavaScript的执行效率。

Python vs. JavaScript:比较用例和应用程序 Python vs. JavaScript:比较用例和应用程序 Apr 21, 2025 am 12:01 AM

Python更适合数据科学和自动化,JavaScript更适合前端和全栈开发。1.Python在数据科学和机器学习中表现出色,使用NumPy、Pandas等库进行数据处理和建模。2.Python在自动化和脚本编写方面简洁高效。3.JavaScript在前端开发中不可或缺,用于构建动态网页和单页面应用。4.JavaScript通过Node.js在后端开发中发挥作用,支持全栈开发。

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