背景

隨著項目越來越大，打包后的包體積也越來越大，嚴重影響了首屏加載速度，需要對路由和組件做懶加載處理

主要用到了react中的lazy和Suspense。

廢話不多說，直接上干貨

路由懶加載

核心代碼

import React, { lazy, Suspense } from "react";
const loading = () => <h3>loading....</h3>;
const Caidan1 = lazy(() => import("@/pages/mud1/caidan1"));

const meunRoutes = [
  {
    name: "模塊1",
    path: "/m1",
    icon: <AppstoreOutlined />,
    children: [
      {
        name: "gltf模型",
        path: "/m1/caidan12",
        icon: <AppstoreOutlined />,
        element: (
          <Suspense fallback={loading()}>
            <Caidan1 />
          </Suspense>
        ),
      },
    // 。。。。

配合路由表的完整例子

// 路由表
import React, { lazy, Suspense } from "react";
import Home from "../pages/home";
import Layout from "@/components/Layout";

const loading = () => <h3>loading....</h3>;

const Caidan1 = lazy(() => import("@/pages/mud1/caidan1"));
const Caidan2 = lazy(() => import("@/pages/mud1/caidan2"));
// 404頁面
const NotFound = () => <h1>**** 404 ****</h1>;

const meunRoutes = [
  {
    name: "模塊1",
    path: "/m1",
    icon: <AppstoreOutlined />,
    children: [
      {
        name: "gltf模型",
        path: "/m1/caidan12",
        icon: <AppstoreOutlined />,
        element: (
          <Suspense fallback={loading()}>
            <Caidan1 />
          </Suspense>
        ),
      },
      {
        name: "模型動畫",
        path: "/m1/caidan13",
        icon: <AppstoreOutlined />,
        element: (
          <Suspense fallback={loading()}>
            <Caidan2 />
          </Suspense>
        ),
      },
    ],
  },
];

// 配置路由表
const routes = [
  {
    path: "/",
    element: <Navigate to="/home" />,
  },
  {
    path: "/home",
    element: <Home />,
  },
  {
    path: "/",
    element: <Layout />,
    children: handleMenuRoutes(meunRoutes),
  },
  { path: "*", element: <NotFound /> },
];

// 處理menu routes
function handleMenuRoutes(arr) {
  let res = [];
  arr.forEach((item) => {
    if (item.children && item.children.length > 0) {
      item.children.forEach((yitem) => {
        let obj = {
          path: yitem.path,
          element: yitem.element,
        };
        res.push(obj);
      });
    }
  });
  return res;
}

const AppRouter = () => useRoutes([...routes]);
export { AppRouter, meunRoutes };

組件懶加載

import { useEffect, useState, lazy, Suspense } from "react";

const TestCpn = lazy(() => import("@/components/testCpn"));
const Home = () => {
  const [show, setShow] = useState(false);

  function fn() { setShow(true)}

  return (
    <div>
      <button onClick={fn}>加載大組件</button>
      {show && (
        <Suspense>
          <TestCpn />
        </Suspense>
      )}
    </div>
  );
};
export default Home;

效果
組件加載前

組件懶加載后

這樣就會大大加快首屏加載速度文章來源地址http://www.zghlxwxcb.cn/news/detail-625223.html

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