\n| @ReusableV2<\/td>\n | \u8ba9\u81ea\u5b9a\u4e49\u884c\u7ec4\u4ef6\u53c2\u4e0e\u590d\u7528<\/td>\n | \u9891\u7e41\u521b\u5efa\u9500\u6bc1\u7ec4\u4ef6，\u590d\u6742\u884c\u66f4\u5bb9\u6613\u5361<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n \u6211\u7684\u5224\u65ad\u89c4\u5219\u5f88\u7b80\u5355：\u6027\u80fd\u4ea4\u7ed9 Repeat + virtualScroll，\u8eab\u4efd\u4ea4\u7ed9\u7a33\u5b9a\u4e1a\u52a1 id，\u884c\u7ec4\u4ef6\u5185\u90e8\u4e0d\u8981\u5077\u5077\u4fdd\u5b58\u4f1a\u548c\u6570\u636e\u8eab\u4efd\u51b2\u7a81\u7684\u72b6\u6001\u3002<\/p>\n \u95ee\u9898\u600e\u4e48\u53d1\u751f<\/h3>\n\u5148\u770b\u4e00\u4e2a\u5e38\u89c1\u9519\u8bef\u3002\u5217\u8868\u4e00\u5f00\u59cb\u53ea\u6709\u5c55\u793a\u65f6，\u7528 index \u505a key \u597d\u50cf\u6ca1\u95ee\u9898：<\/p>\n Repeat<FeedCard>(this.visibleCards)
\n .each((obj: RepeatItem<FeedCard>) => {
\n ListItem() {
\n FeedRow({ item: obj.item })
\n }
\n })
\n .key((item: FeedCard, index: number) => index.toString())<\/p>\n \u8fd9\u4e2a\u5199\u6cd5\u7684\u95ee\u9898\u662f，0\u30011\u30012 \u53ea\u8868\u793a\u5f53\u524d\u4f4d\u7f6e，\u4e0d\u8868\u793a\u8fd9\u6761\u6570\u636e\u672c\u8eab\u3002\u53ea\u8981\u7528\u6237\u505a\u4e86\u7b5b\u9009\u3001\u6392\u5e8f\u3001\u63d2\u5165\u3001\u5220\u9664，\u539f\u6765\u7b2c 1 \u884c\u53ef\u80fd\u5df2\u7ecf\u6362\u6210\u53e6\u4e00\u6761\u6570\u636e，\u4f46\u6846\u67b6\u770b\u5230\u7684 key \u8fd8\u662f 1\u3002\u5982\u679c\u884c\u7ec4\u4ef6\u91cc\u8fd8\u6709\u9009\u4e2d\u6001\u3001\u5c55\u5f00\u6001\u3001\u56fe\u7247\u52a0\u8f7d\u72b6\u6001，\u8fd9\u4e9b\u72b6\u6001\u5c31\u53ef\u80fd\u8ddf\u7740\u4f4d\u7f6e\u8d70，\u800c\u4e0d\u662f\u8ddf\u7740\u6570\u636e\u8d70\u3002<\/p>\n \u6240\u4ee5\u957f\u5217\u8868\u4e0d\u662f\u53ea\u95ee\u201c\u80fd\u4e0d\u80fd\u6e32\u67d3\u51fa\u6765\u201d，\u800c\u662f\u8981\u95ee\u201c\u6570\u636e\u987a\u5e8f\u53d8\u4e86\u4ee5\u540e，\u884c\u72b6\u6001\u8fd8\u8ba4\u4e0d\u8ba4\u8bc6\u539f\u6765\u7684\u5bf9\u8c61\u201d\u3002<\/p>\n \u6848\u4f8b\u4e00：80 \u6761\u5217\u8868\u7528 Repeat + virtualScroll<\/h3>\n\u5148\u51c6\u5907\u4e00\u4e2a\u7a0d\u5fae\u771f\u5b9e\u4e00\u70b9\u7684\u6570\u636e\u6a21\u578b\u3002\u8fd9\u91cc\u6bcf\u6761\u6d88\u606f\u90fd\u6709\u7a33\u5b9a id\u3001\u5c55\u793a\u6807\u9898\u3001\u884c\u7c7b\u578b\u548c\u672a\u8bfb\u6570\u3002selected \u662f\u53ef\u53d8\u5316\u72b6\u6001，\u7528\u6765\u6a21\u62df\u5df2\u8bfb\u3001\u52fe\u9009\u3001\u5c55\u5f00\u8fd9\u7c7b\u884c\u5185\u72b6\u6001\u3002<\/p>\n @ObservedV2
\nexport class FeedCard {
\n @Trace id: string = '';
\n @Trace title: string = '';
\n @Trace kind: string = 'normal';
\n @Trace selected: boolean = false;
\n @Trace unread: number = 0;<\/p>\n constructor(id: string, title: string, kind: string, unread: number) {
\n this.id = id;
\n this.title = title;
\n this.kind = kind;
\n this.unread = unread;
\n }
\n}<\/p>\n export function buildFeedCards(): FeedCard[] {
\n const list: FeedCard[] = [];
\n for (let i = 0; i < 80; i++) {
\n const kind = i % 10 === 0 ? 'banner' : i % 3 === 0 ? 'compact' : 'normal';
\n list.push(new FeedCard(`feed-${i}`, `ArkUI \u5217\u8868\u6d88\u606f ${i}`, kind, i % 7));
\n }
\n return list;
\n}<\/p>\n \u9875\u9762\u91cc\u4e0d\u8981\u76f4\u63a5\u628a\u6240\u6709\u72b6\u6001\u6563\u5728\u7ec4\u4ef6\u6811\u91cc\u3002\u6211\u4f1a\u5148\u628a\u5217\u8868\u6570\u636e\u548c\u7b5b\u9009\u72b6\u6001\u653e\u5728\u9875\u9762\u5c42，\u518d\u7528\u8ba1\u7b97\u5c5e\u6027\u5f97\u5230\u5f53\u524d\u53ef\u89c1\u5217\u8868：<\/p>\n @ComponentV2
\nexport struct CsdnRepeatDemo {
\n @Local cards: FeedCard[] = buildFeedCards();
\n @Local compactOnly: boolean = false;<\/p>\n @Computed
\n get visibleCards(): FeedCard[] {
\n return this.compactOnly
\n ? this.cards.filter((item: FeedCard) => item.kind === 'compact')
\n : this.cards;
\n }
\n}<\/p>\n \u8fd9\u4e2a\u62c6\u6cd5\u7684\u597d\u5904\u662f，\u539f\u59cb\u6570\u636e\u53ea\u6709\u4e00\u4efd，\u7b5b\u9009\u7ed3\u679c\u53ea\u662f\u6d3e\u751f\u51fa\u6765\u7684\u89c6\u56fe\u3002\u540e\u9762\u70b9\u51fb\u3001\u79fb\u52a8\u3001\u7b5b\u9009，\u90fd\u4e0d\u4f1a\u628a\u72b6\u6001\u62c6\u6210\u4e24\u5957\u3002<\/p>\n \u6b63\u786e\u5199\u6cd5：key \u8ddf\u4e1a\u52a1 id \u8d70<\/h3>\n\u4e0b\u9762\u8fd9\u6bb5\u662f\u6211\u672c\u5730\u7f16\u8bd1\u901a\u8fc7\u7684\u6838\u5fc3\u5199\u6cd5：<\/p>\n List({ space: 8 }) {
\n Repeat<FeedCard>(this.visibleCards)
\n .each((obj: RepeatItem<FeedCard>) => {
\n ListItem() {
\n FeedRow({
\n item: obj.item,
\n dense: obj.item.kind === 'compact',
\n onToggle: () => {
\n obj.item.selected = !obj.item.selected;
\n }
\n })
\n }
\n })
\n .key((item: FeedCard) => item.id)
\n .virtualScroll({ totalCount: this.visibleCards.length })
\n}<\/p>\n \u8fd9\u91cc\u6709\u4e24\u4e2a\u5173\u952e\u70b9\u3002<\/p>\n \u7b2c\u4e00，key \u7528 item.id，\u4e0d\u7528 index\u3002\u7b5b\u9009\u4ee5\u540e，feed-12 \u8fd8\u662f feed-12，\u4e0d\u4f1a\u56e0\u4e3a\u5b83\u73b0\u5728\u6392\u5728\u7b2c 0 \u884c\u5c31\u53d8\u6210\u53e6\u4e00\u4e2a\u8eab\u4efd\u3002<\/p>\n \u7b2c\u4e8c，virtualScroll \u7684 totalCount \u8ddf\u5f53\u524d\u53ef\u89c1\u5217\u8868\u957f\u5ea6\u4e00\u81f4\u3002\u8fd9\u6837\u5217\u8868\u5728\u201c\u5168\u90e8\u201d\u548c\u201c\u53ea\u770b compact\u201d\u4e4b\u95f4\u5207\u6362\u65f6，\u865a\u62df\u6eda\u52a8\u77e5\u9053\u5f53\u524d\u6570\u636e\u89c4\u6a21\u53d8\u4e86，\u4e0d\u4f1a\u7ee7\u7eed\u62ff\u65e7\u8303\u56f4\u6765\u5224\u65ad\u3002<\/p>\n \u6848\u4f8b\u4e8c：\u6df7\u5408\u884c\u7ec4\u4ef6\u53c2\u4e0e\u590d\u7528<\/h3>\n\u957f\u5217\u8868\u91cc\u7ecf\u5e38\u4e0d\u662f\u6bcf\u4e00\u884c\u90fd\u957f\u4e00\u6837\u3002\u6709\u7684\u884c\u662f\u666e\u901a\u6d88\u606f，\u6709\u7684\u884c\u662f\u7d27\u51d1\u6d88\u606f，\u6709\u7684\u884c\u662f\u91cd\u70b9\u63d0\u793a\u3002\u8fd9\u4e2a\u65f6\u5019\u5982\u679c\u6bcf\u6b21\u90fd\u521b\u5efa\u9500\u6bc1\u590d\u6742\u7ec4\u4ef6，\u6eda\u52a8\u65f6\u5c31\u5bb9\u6613\u6709\u538b\u529b\u3002<\/p>\n \u884c\u7ec4\u4ef6\u53ef\u4ee5\u7528 @ReusableV2 \u6807\u51fa\u6765，\u8ba9\u5b83\u53c2\u4e0e V2 \u7ec4\u4ef6\u590d\u7528：<\/p>\n @ReusableV2
\n@ComponentV2
\nstruct FeedRow {
\n @Param item: FeedCard = new FeedCard('', '', 'normal', 0);
\n @Param dense: boolean = false;
\n @Event onToggle: () => void = () => {};<\/p>\n build() {
\n Row({ space: 12 }) {
\n Text(this.item.selected ? '\u5df2\u8bfb' : '\u672a\u8bfb')
\n .fontSize(12)
\n .fontColor(this.item.selected ? '#198754' : '#C2410C')<\/p>\n Column({ space: 4 }) {
\n Text(this.item.title)
\n .fontSize(this.dense ? 14 : 16)
\n .fontWeight(FontWeight.Medium)
\n .maxLines(1)
\n .textOverflow({ overflow: TextOverflow.Ellipsis })
\n Text(`id=${this.item.id} \/ type=${this.item.kind} \/ unread=${this.item.unread}`)
\n .fontSize(12)
\n .fontColor('#6B7280')
\n }
\n .layoutWeight(1)<\/p>\n Button('\u5207\u6362')
\n .fontSize(12)
\n .height(30)
\n .onClick(this.onToggle)
\n }
\n .width('100%')
\n .padding(12)
\n .backgroundColor(this.item.kind === 'banner' ? '#FFF7ED' : '#FFFFFF')
\n .borderRadius(10)
\n }
\n}<\/p>\n \u8fd9\u91cc\u6211\u6545\u610f\u8ba9 FeedRow \u4e0d\u81ea\u5df1\u4fdd\u5b58 selected\u3002\u5b83\u53ea\u63a5\u6536 item，\u70b9\u51fb\u540e\u628a\u4fee\u6539\u4ea4\u56de\u5916\u5c42\u6570\u636e\u5bf9\u8c61\u3002\u539f\u56e0\u5f88\u76f4\u63a5：\u7ec4\u4ef6\u4f1a\u88ab\u590d\u7528，\u6570\u636e\u624d\u662f\u7a33\u5b9a\u6765\u6e90\u3002\u884c\u7ec4\u4ef6\u5982\u679c\u81ea\u5df1\u518d\u5b58\u4e00\u4efd\u9009\u4e2d\u6001，\u590d\u7528\u65f6\u5c31\u5bb9\u6613\u51fa\u73b0\u201c\u7ec4\u4ef6\u88ab\u62ff\u53bb\u663e\u793a\u53e6\u4e00\u6761\u6570\u636e，\u4f46\u65e7\u72b6\u6001\u8fd8\u6ca1\u6e05\u5e72\u51c0\u201d\u7684\u95ee\u9898\u3002<\/p>\n \u600e\u4e48\u590d\u73b0\u95ee\u9898<\/h3>\n\u53ef\u4ee5\u6309\u8fd9\u4e2a\u987a\u5e8f\u6d4b：<\/p>\n \u6253\u5f00\u9875\u9762，\u5217\u8868\u663e\u793a 80 \u6761\u6570\u636e\u3002<\/li>\n\u70b9\u51fb\u9996\u884c\u201c\u5207\u6362\u201d，\u9996\u884c\u4ece\u672a\u8bfb\u53d8\u6210\u5df2\u8bfb\u3002<\/li>\n\u70b9\u51fb\u201c\u53ea\u770b compact\u201d，\u5217\u8868\u53ea\u5269\u7d27\u51d1\u884c\u3002<\/li>\n\u518d\u70b9\u51fb\u201c\u663e\u793a\u5168\u90e8\u201d，\u56de\u5230\u5b8c\u6574\u5217\u8868\u3002<\/li>\n\u70b9\u51fb\u201c\u672b\u5c3e\u79fb\u5230\u9876\u90e8\u201d，\u8ba9\u6700\u540e\u4e00\u6761\u6570\u636e\u79fb\u52a8\u5230\u7b2c\u4e00\u884c\u3002<\/li>\n\u5982\u679c key \u7528 index，\u7b2c\u4e09\u6b65\u548c\u7b2c\u4e94\u6b65\u6700\u5bb9\u6613\u66b4\u9732\u95ee\u9898：\u72b6\u6001\u53ef\u80fd\u8ddf\u7740\u4f4d\u7f6e\u8d70\u3002\u4f60\u4ee5\u4e3a\u6539\u7684\u662f\u7b2c\u4e00\u6761\u6570\u636e，\u5b9e\u9645 UI \u590d\u7528\u540e\u663e\u793a\u5230\u522b\u7684\u884c\u4e0a\u3002<\/p>\n \u5982\u679c key \u7528 item.id，\u72b6\u6001\u8ddf\u7740 FeedCard \u8d70\u3002\u54ea\u6015\u7b5b\u9009\u3001\u6062\u590d\u3001\u79fb\u52a8\u987a\u5e8f，feed-79 \u8fd8\u662f feed-79，\u4e0d\u4f1a\u56e0\u4e3a\u5b83\u5230\u4e86\u9876\u90e8\u5c31\u62ff\u5230\u522b\u4eba\u7684\u72b6\u6001\u3002<\/p>\n \u51e0\u79cd\u5199\u6cd5\u600e\u4e48\u9009<\/h3>\n\n\u5199\u6cd5\u9002\u5408\u573a\u666f\u4e0d\u9002\u5408\u573a\u666f<\/tr>\n \n\n| ForEach<\/td>\n | \u6570\u636e\u5c11\u3001\u7ed3\u6784\u7b80\u5355\u3001\u6ca1\u6709\u660e\u663e\u6027\u80fd\u538b\u529b<\/td>\n | \u957f\u5217\u8868\u3001\u590d\u6742\u884c\u3001\u9891\u7e41\u7b5b\u9009\u6392\u5e8f<\/td>\n<\/tr>\n | \n| LazyForEach<\/td>\n | \u8001\u9879\u76ee\u5df2\u6709\u6570\u636e\u6e90\u548c\u61d2\u52a0\u8f7d\u5b9e\u73b0<\/td>\n | \u65b0 V2 \u7ec4\u4ef6\u590d\u7528\u573a\u666f，\u8fc1\u79fb\u6210\u672c\u8981\u8bc4\u4f30<\/td>\n<\/tr>\n | \n| Repeat<\/td>\n | \u6570\u7ec4\u6570\u636e\u3001V2 \u7ec4\u4ef6\u590d\u7528\u3001\u6eda\u52a8\u5bb9\u5668\u91cc\u7684\u957f\u5217\u8868<\/td>\n | \u6ca1\u6709\u7a33\u5b9a key\u3001\u6570\u636e\u8eab\u4efd\u6df7\u4e71\u7684\u5217\u8868<\/td>\n<\/tr>\n | \n| Repeat + virtualScroll<\/td>\n | \u957f\u5217\u8868\u3001\u53ef\u6eda\u52a8\u9875\u9762\u3001\u9700\u8981\u6309\u9700\u6e32\u67d3<\/td>\n | \u53ea\u6709\u51e0\u6761\u9759\u6001\u6570\u636e，\u6ca1\u5fc5\u8981\u589e\u52a0\u590d\u6742\u5ea6<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n \u6211\u73b0\u5728\u66f4\u503e\u5411\u7684\u5199\u6cd5\u662f：\u666e\u901a\u77ed\u5217\u8868\u4e0d\u7528\u786c\u4e0a Repeat；\u53ea\u8981\u5217\u8868\u5f00\u59cb\u53d8\u957f，\u6216\u8005\u884c\u7ec4\u4ef6\u6bd4\u8f83\u91cd，\u5c31\u4f18\u5148\u8003\u8651 Repeat + virtualScroll\u3002\u4f46\u524d\u63d0\u662f\u6570\u636e\u6a21\u578b\u91cc\u5fc5\u987b\u6709\u7a33\u5b9a id\u3002<\/p>\n \u5c01\u88c5\u6210\u9879\u76ee\u89c4\u8303<\/h3>\n\u8fd9\u7c7b\u95ee\u9898\u6700\u597d\u4e0d\u8981\u6bcf\u4e2a\u9875\u9762\u4e34\u65f6\u60f3\u3002\u53ef\u4ee5\u5c01\u88c5\u4e00\u4e2a\u5f88\u5c0f\u7684\u5217\u8868\u89c4\u5219：<\/p>\n export interface StableListItem {
\n id: string;
\n}<\/p>\n export function stableKey(item: StableListItem): string {
\n return item.id;
\n}<\/p>\n export function assertStableIds(items: StableListItem[]): boolean {
\n const ids = new Set<string>();
\n for (const item of items) {
\n if (!item.id || ids.has(item.id)) {
\n return false;
\n }
\n ids.add(item.id);
\n }
\n return true;
\n}<\/p>\n \u9875\u9762\u4f7f\u7528 Repeat \u524d\u5148\u786e\u8ba4\u4e24\u4e2a\u6761\u4ef6：\u6bcf\u6761\u6570\u636e\u6709 id，\u5e76\u4e14 id \u4e0d\u91cd\u590d\u3002\u8fd9\u4e2a\u68c0\u67e5\u770b\u8d77\u6765\u5c0f，\u4f46\u80fd\u63d0\u524d\u62e6\u4f4f\u5f88\u591a\u5217\u8868\u9519\u4f4d\u95ee\u9898\u3002<\/p>\n \u672c\u5730\u9a8c\u8bc1\u7ed3\u679c<\/h3>\n\u8fd9\u7ec4\u793a\u4f8b\u5df2\u7ecf\u63a5\u5165\u672c\u5730 HarmonyOS \u5de5\u7a0b\u5b8c\u6210\u7f16\u8bd1\u9a8c\u8bc1：<\/p>\n :entry:default@CompileArkTS \u6210\u529f
\n:entry:assembleHap \u6210\u529f
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