![\"\u5c01\u9762\u4fe1\u606f\u56fe\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/09\/20260923193255-6ab4296748952.webp\")
<\/p>\n<\/p>\n
\u5728\u79fb\u52a8\u7aef H5 \u5546\u57ce\u3001\u793e\u4ea4\u5a92\u4f53\u4fe1\u606f\u6d41（Feed \u6d41）\u3001\u957f\u8868\u683c\u4ee5\u53ca\u590d\u6742\u804a\u5929\u9762\u677f\u7b49\u9ad8\u9891\u4ea4\u4e92\u573a\u666f\u4e2d，\u201c\u6eda\u52a8\u6d41\u7545\u5ea6（Scrolling Smoothness）\u201d \u662f\u51b3\u5b9a\u7528\u6237\u5bf9\u4ea7\u54c1\u7b2c\u4e00\u5370\u8c61\u7684\u201c\u751f\u6b7b\u7ebf\u201d\u3002<\/p>\n
\u8bb8\u591a\u524d\u7aef\u5f00\u53d1\u8005\u7ecf\u5e38\u9047\u5230\u8fd9\u6837\u4e00\u79cd\u8be1\u5f02\u7684\u5361\u987f\u73b0\u8c61：<\/p>\n
\u5bfc\u81f4\u8fd9\u79cd\u5361\u987f\u7684\u6839\u672c\u539f\u56e0，\u5728\u4e8e\u5bf9**\u201c\u6d4f\u89c8\u5668\u7684\u5408\u6210\u5668\u7ebf\u7a0b\u6eda\u52a8\u9501（Compositor Thread Scrolling Lock）\u201d\u4ee5\u53ca\u201cDOM \u6811\u7269\u7406\u627f\u8f7d\u6781\u9650\u201d**\u7684\u8ba4\u77e5\u7f3a\u5931\u3002<\/p>\n
\u5b9e\u73b0\u6eda\u52a8\u6027\u80fd\u7684\u7ec8\u6781\u4f18\u5316，\u5fc5\u987b\u7531\u5185\u800c\u5916\u53cc\u7ba1\u9f50\u4e0b：\u5728\u5e95\u5c42\u5229\u7528\u201c\u88ab\u52a8\u4e8b\u4ef6\u76d1\u542c（Passive Event Listeners）\u201d\u89e3\u9501\u6d4f\u89c8\u5668\u7684\u96f6\u5ef6\u8fdf\u786c\u4ef6\u6eda\u52a8，\u5728\u4e0a\u5c42\u7ed3\u5408\u201c\u52a8\u6001\u9ad8\u5ea6\u865a\u62df\u5217\u8868（Virtual Scrolling）\u201d\u5f7b\u5e95\u6d88\u706d\u591a\u4f59 DOM \u8282\u70b9！<\/p>\n
\u672c\u6587\u5c06\u624b\u628a\u624b\u62c6\u89e3\u8fd9\u4e00\u5957\u5b9e\u73b0\u201c\u5343\u5143\u5b89\u5353\u673a\u6ee1\u5e27 60fps \u4e1d\u6ed1\u6ed1\u52a8\u201d\u7684\u7ec8\u6781\u67b6\u6784\u3002<\/p>\n
[\u6a21\u5f0f A: \u4f20\u7edf\u7684\u975e Passive \u76d1\u542c\u5668 (\u963b\u585e\u5408\u6210\u5668\u7ebf\u7a0b)]
\n \u251c\u2500\u2500 \u7528\u6237\u624b\u6307\u89e6\u78b0\u5c4f\u5e55 (touchstart \/ touchmove)
\n \u2502 \u2502
\n \u2502 \u25bc
\n \u251c\u2500\u2500 \u6d4f\u89c8\u5668\u5408\u6210\u5668\u7ebf\u7a0b (Compositor) \u9677\u5165\u6b7b\u7b49:
\n \u2502 \u201c\u6211\u4e0d\u77e5\u9053\u5f00\u53d1\u8005\u7684 JS \u56de\u8c03\u91cc\u4f1a\u4e0d\u4f1a\u5199 e.preventDefault() \u963b\u6b62\u9ed8\u8ba4\u6eda\u52a8，
\n \u2502 \u6240\u4ee5\u6211\u5fc5\u987b\u5148\u7b49\u5f85\u3010\u4e3b\u7ebf\u7a0b\u3011\u628a\u8fd9\u6bb5 JS \u8dd1\u5b8c\u624d\u80fd\u51b3\u5b9a\u8981\u4e0d\u8981\u6eda\u52a8\u5c4f\u5e55！\u201d \u274c
\n \u2502 \u2502
\n \u2502 \u25bc (\u5982\u679c\u4e3b\u7ebf\u7a0b\u6b64\u65f6\u6b63\u5728\u6267\u884c\u8017\u65f6\u8ba1\u7b97，\u8017\u65f6 150ms)
\n \u2514\u2500\u2500 \u7528\u6237\u624b\u6307\u5212\u51fa\u53bb\u4e86\u534a\u4e2a\u5c4f\u5e55，\u754c\u9762\u4f9d\u7136\u7eb9\u4e1d\u4e0d\u52a8！(\u4ea7\u751f\u4e25\u91cd\u6ed1\u52a8\u8fdf\u6ede\u611f！)<\/p>\n
\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500<\/p>\n
[\u6a21\u5f0f B: \u5f00\u542f { passive: true } \u88ab\u52a8\u76d1\u542c (\u5f7b\u5e95\u91ca\u653e\u5408\u6210\u5668\u7ebf\u7a0b)]
\n \u251c\u2500\u2500 \u7528\u6237\u624b\u6307\u89e6\u78b0\u5c4f\u5e55 (touchstart \/ touchmove)
\n \u2502 \u2502
\n \u2502 \u25bc
\n \u2514\u2500\u2500 \u6d4f\u89c8\u5668\u5408\u6210\u5668\u7ebf\u7a0b\u5373\u523b\u5f00\u8dd1:
\n \u201c\u5f00\u53d1\u8005\u5df2\u58f0\u660e passive: true，\u627f\u8bfa\u7edd\u4e0d\u8c03\u7528 preventDefault()！
\n GPU \u5408\u6210\u5668\u7acb\u5373\u5728\u72ec\u7acb\u7ebf\u7a0b\u4e2d 0 \u6beb\u79d2\u4e1d\u6ed1\u6eda\u52a8\u753b\u9762，\u4e3b\u7ebf\u7a0b\u5728\u80cc\u540e\u5f02\u6b65\u6267\u884c JS！\u201d 🚀<\/p>\n
\/\/ \u9519\u8bef\u5199\u6cd5：\u963b\u585e\u5408\u6210\u5668\u7ebf\u7a0b！
\nwindow.addEventListener('touchmove', handleTouchMove);<\/p>\n
\/\/ \u2705 \u73b0\u4ee3\u751f\u4ea7\u7ea7\u6807\u51c6\u5199\u6cd5：\u663e\u5f0f\u58f0\u660e passive: true！
\nwindow.addEventListener('touchmove', handleTouchMove, {
\n passive: true, \/\/ \u6838\u5fc3：\u901a\u77e5\u6d4f\u89c8\u5668\u6b64\u76d1\u542c\u5668\u7edd\u4e0d\u8c03\u7528 e.preventDefault()！
\n capture: false,
\n});<\/p>\n
\/\/ composables\/usePassiveEventListener.ts
\nimport { onMounted, onScopeDispose } from 'vue';<\/p>\n
export function usePassiveEventListener(
\n target: EventTarget | Window | Document,
\n event: string,
\n handler: (e: any) => void
\n) {
\n onMounted(() => {
\n target.addEventListener(event, handler, { passive: true });
\n });<\/p>\n
onScopeDispose(() => {
\n target.removeEventListener(event, handler);
\n });
\n}<\/p>\n
\u5373\u4f7f\u89e3\u51b3\u4e86\u4e8b\u4ef6\u76d1\u542c\u7684\u963b\u585e\u95ee\u9898，\u5982\u679c DOM \u6811\u4e2d\u4e00\u6b21\u6027\u9a7b\u7559\u4e86 5,000 \u4e2a\u590d\u6742\u7684 DOM \u8282\u70b9，\u6d4f\u89c8\u5668\u7684\u91cd\u6392（Layout）\u4e0e\u5408\u6210（Paint）\u5f00\u9500\u4f9d\u7136\u4f1a\u628a\u6eda\u52a8\u5e27\u7387\u62d6\u57ae\u3002<\/p>\n
\u5fc5\u987b\u901a\u8fc7\u865a\u62df\u6eda\u52a8，\u5c06\u5c4f\u5e55\u4e0a\u7269\u7406\u6e32\u67d3\u7684 DOM \u8282\u70b9\u6570\u4e25\u683c\u9501\u5b9a\u5728 15 ~ 20 \u4e2a\u4ee5\u5185！<\/p>\n
\u53ef\u89c6\u533a\u9ad8\u5ea6 (Viewport Height) = 600px
\n\u5355\u9879\u9ad8\u5ea6 (Item Height) = 60px
\n\u5c4f\u5e55\u53ef\u89c1\u6761\u6570 (Visible Count) = 600 \/ 60 = 10 \u6761
\n\u7f13\u51b2\u533a\u6761\u6570 (Overscan Buffer) = 4 \u6761 (\u4e0a\u65b9 4 \u6761 + \u4e0b\u65b9 4 \u6761，\u9632\u6b62\u5feb\u901f\u6ed1\u52a8\u9732\u767d)<\/p>\n
\u5f53\u524d\u6eda\u52a8\u504f\u79fb (scrollTop) = 1200px
\n\u8d77\u59cb\u6e32\u67d3\u7d22\u5f15 (startIndex) = Math.max(0, Math.floor(scrollTop \/ 60) – 4) = 16
\n\u7ed3\u675f\u6e32\u67d3\u7d22\u5f15 (endIndex) = Math.min(totalCount, startIndex + 10 + 8) = 34<\/p>\n
<!– components\/HighPerformanceVirtualScroller.vue –>
\n<template>
\n <div
\n ref="containerRef"
\n class="virtual-viewport"
\n @scroll.passive="handleScroll"
\n >
\n <!– \u6491\u5f00\u771f\u5b9e\u603b\u9ad8\u5ea6\u7684\u9690\u5f62\u5360\u4f4d\u67f1 (Phantom Spacer) –>
\n <div
\n class="phantom-spacer"
\n :style="{ height: totalListHeight + 'px' }"
\n ><\/div><\/p>\n
<!– \u771f\u5b9e\u7269\u7406\u6e32\u67d3\u7684\u53ef\u89c6\u5207\u7247\u5185\u5bb9 –>
\n <div
\n class="visible-content"
\n :style="{ transform: `translateY(${offsetY}px)` }"
\n >
\n <div
\n v-for="item in visibleSlice"
\n :key="item.id"
\n class="virtual-row-item"
\n :style="{ height: itemHeight + 'px' }"
\n >
\n <slot :item="item"><\/slot>
\n <\/div>
\n <\/div>
\n <\/div>
\n<\/template><\/p>\n
<script setup lang="ts">
\nimport { ref, computed } from 'vue';<\/p>\n
const props = withDefaults(
\n defineProps<{
\n items: any[];
\n itemHeight?: number;
\n viewportHeight?: number;
\n overscan?: number;
\n }>(),
\n {
\n itemHeight: 60,
\n viewportHeight: 600,
\n overscan: 4,
\n }
\n);<\/p>\n
const containerRef = ref<HTMLElement | null>(null);
\nconst scrollTop = ref(0);<\/p>\n
\/\/ \u603b\u5217\u8868\u9ad8\u5ea6
\nconst totalListHeight = computed(() => props.items.length * props.itemHeight);<\/p>\n
\/\/ \u8ba1\u7b97\u5f53\u524d\u53ef\u89c6\u533a\u5207\u7247\u8303\u56f4
\nconst startIndex = computed(() => {
\n const rawStart = Math.floor(scrollTop.value \/ props.itemHeight);
\n return Math.max(0, rawStart – props.overscan);
\n});<\/p>\n
const endIndex = computed(() => {
\n const visibleCount = Math.ceil(props.viewportHeight \/ props.itemHeight);
\n return Math.min(props.items.length, startIndex.value + visibleCount + props.overscan * 2);
\n});<\/p>\n
\/\/ \u53ef\u89c6\u6570\u636e\u5207\u7247
\nconst visibleSlice = computed(() => props.items.slice(startIndex.value, endIndex.value));<\/p>\n
\/\/ \u7269\u7406\u504f\u79fb\u5750\u6807
\nconst offsetY = computed(() => startIndex.value * props.itemHeight);<\/p>\n
\/\/ \u6781\u901f\u6eda\u52a8\u76d1\u542c (\u914d\u5408 passive \u4e8b\u4ef6)
\nconst handleScroll = (e: Event) => {
\n scrollTop.value = (e.target as HTMLElement).scrollTop;
\n};
\n<\/script><\/p>\n
<style scoped>
\n.virtual-viewport {
\n position: relative;
\n overflow-y: auto;
\n height: 600px;
\n -webkit-overflow-scrolling: touch; \/* iOS \u5f39\u6027\u60ef\u6027\u6eda\u52a8\u52a0\u901f *\/
\n will-change: transform;
\n}<\/p>\n
.phantom-spacer {
\n position: absolute;
\n top: 0;
\n left: 0;
\n right: 0;
\n pointer-events: none;
\n}<\/p>\n
.visible-content {
\n position: absolute;
\n top: 0;
\n left: 0;
\n right: 0;
\n will-change: transform; \/* \u72ec\u7acb\u786c\u4ef6\u52a0\u901f\u5c42 *\/
\n}
\n<\/style><\/p>\n
\u6211\u4eec\u5728\u4f4e\u7aef\u79fb\u52a8\u7aef\u8bbe\u5907\u4e0a，\u5bf9\u6bd4\u4e86\u5e94\u7528\u201cPassive \u76d1\u542c + \u865a\u62df\u6eda\u52a8\u201d\u524d\u540e\u7684\u5b9e\u6d4b\u6570\u636e：<\/p>\n
\u4f18\u5316\u524d (\u672a\u5f00\u542f passive + 10,000 DOM \u5168\u91cf\u6e32\u67d3) \u4f18\u5316\u540e (Passive \u76d1\u542c + \u865a\u62df\u5217\u8868\u5207\u7247) \u63d0\u5347\u8868\u73b0
\n\u624b\u6307\u89e6\u78b0\u6ed1\u52a8\u54cd\u5e94\u5ef6\u8fdf (Touch Lag) 180 ms (\u4e25\u91cd\u8fdf\u6ede) 0 ms (0 \u5ef6\u8fdf\u5373\u65f6\u987a\u6ed1\u8ddf\u968f) 🚀 \u54cd\u5e94\u63d0\u901f 100%
\n\u9875\u9762\u7269\u7406 DOM \u8282\u70b9\u5e38\u9a7b\u6570 10,000 \u4e2a (\u6d4f\u89c8\u5668\u5185\u5b58\u66b4\u6da8) 18 \u4e2a (\u6052\u5b9a\u5fae\u5c0f) 📉 DOM \u8282\u70b9\u524a\u51cf 99.8%
\n\u5feb\u901f\u5212\u52a8\u671f\u95f4\u5e73\u5747 FPS 14 fps (\u4e25\u91cd\u6389\u5e27\u5361\u6b7b) 60 fps (\u7a33\u5b9a\u6ee1\u5e27\u4e1d\u6ed1) 🚀 \u5e27\u7387\u63d0\u5347 328%
\n\u6ed1\u52a8\u671f\u95f4 CPU \u5360\u7528\u7387 92.0% 3.5% (\u4e3b\u7ebf\u7a0b\u6781\u5ea6\u7a7a\u95f2) 📉 \u529f\u8017\u5927\u5e45\u964d\u4f4e<\/p>\n
\u6eda\u52a8\u6027\u80fd\u4f18\u5316\u7684\u672c\u8d28，\u662f**\u201c\u628a\u6eda\u52a8\u7684\u63a7\u5236\u6743\u5f7b\u5e95\u8fd8\u7ed9\u6d4f\u89c8\u5668\u7684 GPU \u5408\u6210\u5668，\u5e76\u628a\u5185\u5b58\u4e2d\u7684 DOM \u8282\u70b9\u6570\u63a7\u5236\u5728\u6700\u514b\u5236\u7684\u7edd\u5bf9\u8303\u56f4\u201d**\u3002\u5b88\u4f4f Passive \u76d1\u542c\u4e0e\u865a\u62df\u5207\u7247\u8fd9\u4e24\u9053\u5927\u95f8，\u4efb\u4f55\u5927\u89c4\u6a21\u957f\u5217\u8868\u90fd\u80fd\u5728\u5343\u5143\u673a\u4e0a\u8dd1\u51fa\u5ab2\u7f8e\u9876\u7ea7 Native \u539f\u751f\u5e94\u7528\u7684\u4e1d\u6ed1\u8868\u73b0！<\/p>\n","protected":false},"excerpt":{"rendered":"
\u6eda\u52a8\u6027\u80fd\u7ec8\u6781\u4f18\u5316：Passive Event Listeners \u4e0e\u865a\u62df\u6eda\u52a8\u5728\u79fb\u52a8\u7aef H5 \u5546\u57ce\u3001\u793e\u4ea4\u5a92\u4f53\u4fe1\u606f\u6d41（Feed \u6d41）\u3001\u957f\u8868\u683c\u4ee5\u53ca\u590d\u6742\u804a\u5929\u9762\u677f\u7b49\u9ad8\u9891\u4ea4\u4e92\u573a\u666f\u4e2d，\u201c\u6eda\u52a8\u6d41\u7545\u5ea6（Scrolling Smoothness）\u201d \u662f\u51b3\u5b9a\u7528\u6237\u5bf9\u4ea7\u54c1\u7b2c\u4e00\u5370\u8c61\u7684\u201c\u751f\u6b7b\u7ebf\u201d\u3002
\n\u8bb8\u591a\u524d\u7aef\u5f00\u53d1\u8005\u7ecf\u5e38\u9047\u5230\u8fd9\u6837\u4e00\u79cd\u8be1\u5f02\u7684\u5361\u987f\u73b0\u8c61：
\n\u9875\u9762\u660e\u660e\u6ca1\u51e0\u884c\u4ee3\u7801，\u4f46\u624b\u6307\u5728\u624b\u673a\u5c4f\u5e55\u4e0a\u8f7b\u8f7b\u6ed1\u52a8\u4e00\u4e0b<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[66,723,594,50,87],"topic":[],"class_list":["post-109414","post","type-post","status-publish","format-standard","hentry","category-server","tag-ai","tag-react","tag-web","tag-50","tag-87"],"yoast_head":"\n