网页应用性能最佳实践

import { useReportFullyDrawn } from '@amazon-devices/kepler-performance-api';
import React, { useEffect, useState, useRef } from 'react';
import {VegaAppStateChange, useAddVegaAppStateListenerCallback, useGetCurrentVegaAppStateCallback} from '@amazon-devices/react-native-kepler';
...
...
export const App = () => {
    const reportFullyDrawnCallback = useReportFullyDrawn();
    const getCurrentVegaAppStateCallback = useGetCurrentVegaAppStateCallback();
    const addVegaAppStateListenerCallback = useAddVegaAppStateListenerCallback();
    const [appState, setAppState] = useState(getCurrentVegaAppStateCallback);

    // 在首次渲染后以及在状态更改为前台时，
    // 使用useEffect挂钩来报告完全绘制的内容。
    // 如果应用执行额外的异步处理，
    // 并且需要在完全绘制之前完成该操作，
    // 则在依赖项数组中传递完成状态，
    // 并检查挂钩内部的状态。
    useEffect(() => {
        const changeSubscription = addVegaAppStateListenerCallback(
            'change',
            handleAppStateChange
        );
    }, [reportFullyDrawnCallback]);

    const handleAppStateChange = (nextAppState: any) => {
        if (
            appState.match(/inactive|background/) &&
            nextAppState === 'active'
        ) {
            reportFullyDrawnCallback();
        }
        setAppState(nextAppState);
    };
    ...
    ...
    return (
        <View style={styles.sectionContainer}>
      <WebView
      .
      .
      .
      onLoad={(event) => {
          console.log("onLoad url: ", event.nativeEvent.url)
          // 隐藏启动画面并呈现内容
          SplashScreenManager.hideAsync(your.package.name).catch((e) => {
            console.error("隐藏启动画面时出错：" , e) });
          // 仅当实际页面加载时才报告完全绘制
          if("https://mywebapp.com/home" === event.nativeEvent.url)
          {
            reportFullyDrawnCallback();
          }
        }}
        />
    </View>
    );
};

<!-- Inefficient and may not be needed for all cases -->
<script src="https://utils.js"></script>
<script src="https://api.js"></script>
<scriptsrc="https://main.js"></script>

<!-- Optimized - as long as it can be logically combined -->
<script src="https://app.bundle.js" defer></script>

// 异步加载JavaScript
<script src="https://analytics.js" defer></script>

// 在需要时动态导入数据/JavaScript
import('./data.js').then(initData);