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前言

在这篇博客中，我们将封装一个头部组件，根据不同设备类型来显示不同的导航菜单，会继续使用 React hooks 和styled-components库来构建这个组件，此外，也会实现切换国际化功能。

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Header头部相关组件

1. 功能分析

（1）根据用户的设备类型（移动设备或PC设备），动态渲染不同的导航菜单。
（2）封装的 useIsMobile hook函数，判断用户的设备类型
（3）封装导航菜单 NavMenu组件，根据是否是移动设备来决定渲染哪个导航菜单
（4）封装国际化语言切换弹窗组件，实现切换语言功能
（5）移动端导航菜单按钮由三个div元素组成，点击后元素添加动画效果，并控制导航菜单显示与否
（5）使用到的全局组件请看之前文章国际化配置、全局常用组件弹窗Dialog封装、全局常用组件Select封装、全局常用组件Link封装

2. 相关组件代码+详细注释

（1）首先，先来封装一个导航菜单组件

// @/components/Header/NavMenu/index.tsx
import { memo, FC } from "react";
import classNames from "classnames";
import { useTranslation } from "react-i18next";
import Link from "@/components/Link";
import LanguagePanel from "@/components/Header/LanguagePanel";
import { MobileMenuList, PCMenuList } from "./styled";

interface navListMap {
  name: string; // 菜单名称
  url: string; // 菜单链接地址
}

/**
 * 获取导航菜单列表
 * @returns {navListMap[]} 导航菜单列表
 */
const useNavList = () => {
  const { t } = useTranslation();
  const list: navListMap[] = [
    {
      name: t("navbar.home"),
      url: "/home",
    },
    {
      name: t("navbar.nervos_dao"),
      url: "/nervosdao",
    },
    {
      name: t("navbar.tokens"),
      url: "/tokens",
    },
    {
      name: t("navbar.fee_rate"),
      url: "/fee-rate-tracker",
    },
    {
      name: t("navbar.charts"),
      url: "/charts",
    },
  ];
  return list;
};

/**
 * 移动端导航菜单
 * @returns {JSX.Element}
 */
const MobileMenu: FC<{ navList: navListMap[] }> = ({ navList }) => {
  return (
    <MobileMenuList>
      {navList.map((item) => (
        <Link className={classNames("mobile-menu-list")} to={item.url ?? "/"} key={item.name}>
          {item.name}
        </Link>
      ))}
      <LanguagePanel /> {/* 语言选择组件 */}
    </MobileMenuList>
  );
};
/**
 * 桌面端导航菜单
 * @returns {JSX.Element}
 */
const PCMenu: FC<{ navList: navListMap[] }> = ({ navList }) => {
  return (
    <>
      <PCMenuList>
        {navList.map((item) => (
          <Link className={classNames("nav-item")} to={item.url ?? "/"} key={item.name}>
            {item.name}
          </Link>
        ))}
      </PCMenuList>
      <LanguagePanel /> {/* 语言选择组件 */}
    </>
  );
};

/**
 * 导航菜单组件
 * @param {boolean} isMobile - 是否是移动端
 * @returns {JSX.Element} 导航菜单组件
 */
export default memo<{ isMobile: boolean }>(({ isMobile }) => {
  const navList = useNavList();
  return isMobile ? <MobileMenu navList={navList} /> : <PCMenu navList={navList}></PCMenu>;
});
-----------------------------------------------------------------------------
// @/components/Header/NavMenu/styled.tsx
import styled from "styled-components";
export const MobileMenuList = styled.div`
  width: 100vw;
  height: calc(100vh - var(--cd-navbar-height));
  position: absolute;
  top: var(--cd-navbar-height);
  box-sizing: border-box;
  left: 0;
  background: #2b2c30;
  .mobile-menu-list {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    margin: 20px 40px;
    color: #fff;
  }
  .language-switch {
    margin-left: 40px;
    text-align: left;
  }
`;
export const PCMenuList = styled.div`
  display: flex;
  flex: 1;
  min-width: 0;
  .nav-item {
    display: flex;
    align-items: center;
    flex-shrink: 0;
    margin-right: 50px;
    color: white;
    &:hover {
      color: var(--cd-primary-color);
    }
  }
`;

（2）接下来我们开始封装国际化语言切换组件，在其中会引用到之前文章封装的Dialog组件和Select组件

// @/components/Header/LanguagePanel/index.tsx
import { useState, memo } from "react";
import { useLocation } from "react-router";
import { useTranslation } from "react-i18next";
import { SupportedLngs, useChangeLanguage } from "@/config/i18n";
import { LanguageContainer } from "./styled";
import Dialog from "@/pages/components/commonDialog";
import Select from "@/components/Select";
type Option = {
  label: string; // 选项的显示文本
  value: string; // 选项的值
};
export default memo(() => {
  // 获取当前语言
  const { pathname } = useLocation();
  const currentLanguage = pathname.split("/")[1];
  // 获取语言切换的钩子函数
  const { changeLanguage } = useChangeLanguage();
  // 获取国际化的钩子函数
  const { t } = useTranslation();
  // 控制语言弹框的显示隐藏
  const [languageModalVisible, setLanguageModalVisible] = useState(false);
  // 当前选中的语言
  const [language, setLanguage] = useState(currentLanguage);
  // 获取所有支持的语言
  const lngOptions: Option[] = SupportedLngs.map((lng) => ({
    value: lng,
    label: t(`navbar.language_${lng}`),
  }));
  // 关闭切换语言弹框
  const handlerClose = () => {
    setLanguageModalVisible(!languageModalVisible);
  };
  // 确定切换语言
  const handlerDone = () => {
    return new Promise((resolve) => {
      changeLanguage(language);
      handlerClose();
      resolve(true);
    });
  };
  // 切换语言
  const handlerLanguageChange = (value: string) => {
    setLanguage(value);
  };
  // 打开语言弹框
  const handlerOpenLanguage = () => {
    setLanguageModalVisible(!languageModalVisible);
  };
  // 语言选择弹框
  return (
    <>
      {/* 语言切换 */}
      <LanguageContainer  className={classNames("language-switch")} onClick={handlerOpenLanguage}>
        <i className="iconfont icon-guojihua"></i>
        <span>{t("navbar.language")}</span>
      </LanguageContainer>
      {/* 语言选择弹框 */}
      <Dialog title={t("navbar.language_switch")} doneText={t("button.confirm")} show={languageModalVisible} onClose={handlerClose} onDoneClick={handlerDone}>
        <Select options={lngOptions} onChange={handlerLanguageChange} defaultValue={currentLanguage} placeholder={t("placeholder.default")}></Select>
      </Dialog>
    </>
  );
});
-----------------------------------------------------------------------------
// @/components/Header/LanguagePanel/styled.tsx
import styled from "styled-components";
export const LanguageContainer = styled.div`
  color: #ffffff;
  cursor: pointer;
  span {
    margin-left: 5px;
  }
`;

（3）最后一步，封装父组件Header组件，并引入NavMenu组件和LanguagePanel组件

// @/components/Header/index.tsx
import { FC, useState } from "react";
import classNames from "classnames";
import LogoIcon from "@/assets/headerLogo.png";
import { Header, Logo, MobileMenuContainer, HeaderContainer } from "./styled";
import { useIsMobile } from "@/hooks";
import NavMenu from "./NavMenu";

// 头部组件
const HeaderComponent: FC = () => {
  // 判断是否是移动端
  const isMobile = useIsMobile();

  // PC端导航菜单组件
  const PCMenus: FC = () => {
    return <NavMenu isMobile={isMobile} />;
  };

  // 移动端导航菜单
  const MobileMenus: FC = () => {
    // 控制移动端菜单是否显示的状态
    const [mobileMenuVisible, setMobileMenuVisible] = useState<boolean>(false);

    return (
      <MobileMenuContainer>
        <div className={mobileMenuVisible ? "close" : ""} onClick={() => setMobileMenuVisible(!mobileMenuVisible)}>
          <div className={classNames("firstLine")} />
          <div className={classNames("secondLine")} />
          <div className={classNames("thirdLine")} />
        </div>
        {mobileMenuVisible && isMobile && <NavMenu isMobile={isMobile} />}
      </MobileMenuContainer>
    );
  };

  return (
    <HeaderContainer>
      <Header>
        <Logo to="/">
          <img src={LogoIcon} alt="logo" />
        </Logo>
        {isMobile ? <MobileMenus /> : <PCMenus />}
      </Header>
    </HeaderContainer>
  );
};

export default HeaderComponent;
------------------------------------------------------------------------------
// @/components/Header/styled.tsx
import styled from "styled-components";
import Link from "../Link";
export const HeaderContainer = styled.div`
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  flex-direction: column;
`;
export const Header = styled.div`
  width: 100%;
  min-height: var(--cd-navbar-height);
  background-color: #2b2c30;
  overflow: visible;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  padding: 0 120px;

  @media (max-width: 1440px) {
    padding: 0 100px;
  }

  @media (max-width: 1200px) {
    padding: 0 45px;
  }

  @media (max-width: 780px) {
    padding: 0 18px;
  }
`;

export const Logo = styled(Link)`
  display: flex;
  align-items: center;
  margin-right: 40px;

  img {
    width: 140px;
  }
`;

export const MobileMenuContainer = styled.div`
  display: flex;
  justify-content: flex-end;
  flex: 1;
  .firstLine,
  .secondLine,
  .thirdLine {
    width: 18px;
    height: 2px;
    background-color: #fff;
    margin: 5px 0;
    transition: 0.4s;
  }
  .close {
    .firstLine {
      transform: rotate(45deg) translate(6px, 3px);
    }
    .secondLine {
      opacity: 0;
    }
    .thirdLine {
      transform: rotate(-45deg) translate(6px, -4px);
    }
  }
  .mobile-menu {
    width: 100vw;
    height: calc(100vh - var(--cd-navbar-height));
    position: absolute;
    top: var(--cd-navbar-height);
    box-sizing: border-box;
    left: 0;
    background: #2b2c30;
    .mobile-menu-list {
      display: flex;
      flex-direction: column;
      align-items: flex-start;
      margin: 20px 40px;
      color: #fff;
    }
  }
`;

`;

（4）贴上封装的判断设备的钩子函数，自行取用即可

import { useEffect, useState } from "react";
import variables from "@/styles/variables.module.scss";

/**
 * copied from https://usehooks-ts.com/react-hook/use-media-query
 */
export function useMediaQuery(query: string): boolean {
  const getMatches = (query: string): boolean => {
    // Prevents SSR issues
    if (typeof window !== "undefined") {
      return window.matchMedia(query).matches;
    }
    return false;
  };

  const [matches, setMatches] = useState<boolean>(getMatches(query));

  useEffect(() => {
    const matchMedia = window.matchMedia(query);
    const handleChange = () => setMatches(getMatches(query));

    // Triggered at the first client-side load and if query changes
    handleChange();

    // Listen matchMedia
    if (matchMedia.addListener) {
      matchMedia.addListener(handleChange);
    } else {
      matchMedia.addEventListener("change", handleChange);
    }

    return () => {
      if (matchMedia.removeListener) {
        matchMedia.removeListener(handleChange);
      } else {
        matchMedia.removeEventListener("change", handleChange);
      }
    };
  }, [query]);

  return matches;
}

/**
 * 移动端断点，单位为px
 */
export const mobileBreakPoint = Number(variables.mobileBreakPoint.replace("px", ""));

/**
 * 是否是大型屏幕
 */
export const useIsXXLBreakPoint = () => useMediaQuery(`(max-width: ${variables.xxlBreakPoint})`);

/**
 * 是否处是移动端
 */
export const useIsMobile = () => useMediaQuery(`(max-width: ${variables.mobileBreakPoint})`);

/**
 * 是否处于最大宽度为extraLargeBreakPoint的断点，如果exact为true，则需要同时不处于mobileBreakPoint的断点
 */
export const useIsExtraLarge = (exact = false) => {
  const isMobile = useIsMobile();
  const isExtraLarge = useMediaQuery(`(max-width: ${variables.extraLargeBreakPoint})`);
  return !exact ? isExtraLarge : isExtraLarge && !isMobile;
};

3. 使用方式

// 在layout布局组件中引入
import Header from "@/components/Header";
// 使用
<Header />

4. Gif图效果展示

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总结

下一篇讲【开始首页编码教学】。关注本栏目，将实时更新。