预取与预加载微前端
学习如何预判用户导航并提前获取微前端资源包，让页面切换感觉即时完成。
预取与预加载微前端 是 CoddyKit 上的免费 Micro Frontends Architecture with Module Federation 课时。 这是第 4 节课，共 4 节。 你可以在下方免费阅读本课时的完整内容 — 然后在浏览器中使用内置代码编辑器和全天候 AI 导师进行实践。 这是 Micro Frontends Architecture with Module Federation 学习路径的一部分，你的进度在网页和 CoddyKit 应用中同步。 Micro Frontends Architecture with Module Federation 课程共包含 4 节课。
本课时的部分内容尚未翻译，以英文显示。
From Lazy to Eager-ish
Lazy loading saves the initial load but adds a wait when the user first visits an MFE. Prefetching closes that gap by fetching likely-needed bundles in advance.
Prefetch vs Preload
The browser offers two hints:
- preload: fetch now, high priority, needed soon
- prefetch: fetch when idle, low priority, maybe needed later
Resource Hint Tags
You can hint the browser directly with link tags, letting it fetch an MFE bundle during idle time.
<link rel="prefetch" href="/products/remoteEntry.js">
<link rel="preload" href="/cart/remoteEntry.js" as="script">Prefetching on Intent
A powerful trick: start fetching an MFE when the user hovers a link, well before they click. The bundle is often ready by the time the click lands.
link.addEventListener("mouseenter", () => {
import("products/App");
});Programmatic Prefetch with import()
Because Module Federation uses dynamic import(), calling it early (without using the result) warms the cache for later.
function prefetchProducts() {
import("products/App"); // result ignored
}Prefetch After First Paint
Fetch the most likely next MFE once the initial page is interactive, using idle time so it never competes with critical content.
requestIdleCallback(() => {
import("cart/App");
});Predicting What to Prefetch
Use analytics to learn common navigation paths. If most users go from home to products, prefetch the products MFE right after the home page loads.
Avoiding Over-Prefetching
Prefetching everything wastes bandwidth and battery, especially on mobile. Prefetch only high-probability destinations, and respect data-saver settings.
if (!navigator.connection?.saveData) {
import("products/App");
}Preloading Shared Dependencies
Preloading shared libraries (like React) used by upcoming MFEs further smooths transitions, since the shared chunk is already cached when the MFE mounts.
Measuring the Impact
Track the time from navigation intent to MFE-rendered. Effective prefetching should noticeably shrink this metric in real-user monitoring.
A Balanced Strategy
Combine techniques: preload the next MFE on hover, prefetch the single most likely route on idle, and skip prefetch on constrained networks.
Quick Check
Test your prefetching knowledge.
Recap
You learned to prefetch micro frontends:
- Prefetch fills the wait that lazy loading leaves
- Use preload (soon) vs prefetch (maybe later)
- Fetch on hover/intent and during idle time
- Predict routes from analytics
- Avoid over-prefetching on slow networks
Smart prefetching makes MFE navigation feel instant.
常见问题解答
「预取与预加载微前端」课时是免费的吗？
是的 — 「预取与预加载微前端」的完整文本可在网页上免费阅读。要进行交互式练习（内置代码编辑器和全天候 AI 导师）并解锁 Micro Frontends Architecture with Module Federation 课程的其余内容，请升级到 CoddyKit PRO。 Micro Frontends Architecture with Module Federation 课程共包含 4 节课。
「预取与预加载微前端」这节课中我会学到什么？
学习如何预判用户导航并提前获取微前端资源包，让页面切换感觉即时完成。 你通过在浏览器中直接运行的动手代码来练习 Micro Frontends Architecture with Module Federation，全天候 AI 导师会在你学习这节课的过程中回答你的问题。
学习 Micro Frontends Architecture with Module Federation 需要有经验吗？
无需任何先前经验。CoddyKit 上的 Micro Frontends Architecture with Module Federation 课程适合初学者到高级学习者，你可以从这里开始或从头开始，按照自己的节奏学习。 这是第 4 节课，共 4 节。
「预取与预加载微前端」课时需要多长时间？
大多数 CoddyKit 课程大约需要 5–10 分钟。每节课都很精短且互动，所以你能稳步进步，并在网页和应用中从离开的地方继续。
我能在这节 Micro Frontends Architecture with Module Federation 课中编写并运行代码吗？
能。每节 Micro Frontends Architecture with Module Federation 课都包含内置代码编辑器，你可以在浏览器中直接编写并运行真实代码，并获得即时 AI 反馈 — 无需本地设置。