wehub-skill-sync
53 lines
1.1 KiB
Markdown
53 lines
1.1 KiB
Markdown
---
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title: Preload Based on User Intent
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impact: MEDIUM
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impactDescription: 降低感知延迟
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tags: bundle, preload, user-intent, hover
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---
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## 基于用户意图的预加载
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在需要之前预加载体积庞大的包，以降低感知延迟。
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**示例（悬停/聚焦时预加载）：**
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```tsx
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function EditorButton({ onClick }: { onClick: () => void }) {
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const preload = () => {
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if (typeof window !== 'undefined') {
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void import('./monaco-editor')
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}
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}
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return (
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<button
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onMouseEnter={preload}
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onFocus={preload}
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onClick={onClick}
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>
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Open Editor
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</button>
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)
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}
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```
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**示例（功能开关启用时预加载）：**
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```tsx
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function FlagsProvider({ children, flags }: Props) {
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useEffect(() => {
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if (flags.editorEnabled && typeof window !== 'undefined') {
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void import('./monaco-editor').then(mod => mod.init())
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}
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}, [flags.editorEnabled])
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return <FlagsContext.Provider value={flags}>
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{children}
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</FlagsContext.Provider>
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}
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```
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`typeof window !== 'undefined'` 检查可防止将预加载模块打包到 SSR 中，从而优化服务端打包体积和构建速度。
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