{"id":38193,"date":"2023-03-09T01:14:46","date_gmt":"2023-07-23T01:37:47","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e4%bd%bf%e7%94%a8react%e5%ae%9e%e7%8e%b0%e6%97%a0%e9%99%90%e6%bb%9a%e5%8a%a8%e3%80%82%e6%97%a0%e9%9c%80%e4%bb%bb%e4%bd%95%e6%89%8b%e5%86%8c%e6%88%96%e5%ba%93\/"},"modified":"2024-04-29T17:59:22","modified_gmt":"2024-04-29T09:59:22","slug":"%e4%bd%bf%e7%94%a8react%e5%ae%9e%e7%8e%b0%e6%97%a0%e9%99%90%e6%bb%9a%e5%8a%a8%e3%80%82%e6%97%a0%e9%9c%80%e4%bb%bb%e4%bd%95%e6%89%8b%e5%86%8c%e6%88%96%e5%ba%93","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e4%bd%bf%e7%94%a8react%e5%ae%9e%e7%8e%b0%e6%97%a0%e9%99%90%e6%bb%9a%e5%8a%a8%e3%80%82%e6%97%a0%e9%9c%80%e4%bb%bb%e4%bd%95%e6%89%8b%e5%86%8c%e6%88%96%e5%ba%93\/","title":{"rendered":"\u4f7f\u7528React\u5b9e\u73b0\u65e0\u9650\u6eda\u52a8\u3002(\u65e0\u9700\u4efb\u4f55\u624b\u518c\u6216\u5e93)"},"content":{"rendered":"

\u9996\u5148<\/h2>\n

\u5982\u6807\u9898\u6240\u8ff0\uff0c\u6211\u4eec\u5c06\u4f7f\u7528React\u6765\u5b9e\u73b0\u65e0\u9650\u6eda\u52a8\u3002\u6211\u4eec\u6ca1\u6709\u4f7f\u7528\u4efb\u4f55\u5e93\uff0c\u800c\u662f\u5229\u7528IntersectionObserver\u6765\u521b\u5efa\u3002<\/p>\n

\u9879\u76ee\u6210\u679c<\/h2>\n

 <\/p>\n

\u6e90\u4ee3\u7801<\/h3>\n
~\/develop\/HITOTSU\/react_infinity_scroll$ <\/span>tree -I<\/span> node_modules \r\n.<\/span>\r\n\u251c\u2500\u2500 README.md\r\n\u251c\u2500\u2500 package.json\r\n\u251c\u2500\u2500 public\r\n\u2502   \u251c\u2500\u2500 favicon.ico\r\n\u2502   \u251c\u2500\u2500 index.html\r\n\u2502   \u251c\u2500\u2500 logo192.png\r\n\u2502   \u251c\u2500\u2500 logo512.png\r\n\u2502   \u251c\u2500\u2500 manifest.json\r\n\u2502   \u2514\u2500\u2500 robots.txt\r\n\u251c\u2500\u2500 src\r\n\u2502   \u251c\u2500\u2500 App.tsx\r\n\u2502   \u251c\u2500\u2500 hooks\r\n\u2502   \u2502   \u2514\u2500\u2500 useInfinityScroll.tsx\r\n\u2502   \u251c\u2500\u2500 index.tsx\r\n\u2502   \u2514\u2500\u2500 logo.svg\r\n\u251c\u2500\u2500 tsconfig.json\r\n\u2514\u2500\u2500 yarn.lock\r\n\r\n4 directories, 14 files\r\n<\/code><\/pre>\n
import<\/span> React<\/span> from<\/span> '<\/span>react<\/span>'<\/span>;<\/span>\r\nimport<\/span> ReactDOM<\/span> from<\/span> '<\/span>react-dom\/client<\/span>'<\/span>;<\/span>\r\nimport<\/span> App<\/span> from<\/span> '<\/span>.\/App<\/span>'<\/span>;<\/span>\r\n\r\nconst<\/span> root<\/span> =<\/span> ReactDOM<\/span>.<\/span>createRoot<\/span>(<\/span>\r\n  document<\/span>.<\/span>getElementById<\/span>(<\/span>'<\/span>root<\/span>'<\/span>)<\/span> as<\/span> HTMLElement<\/span>\r\n);<\/span>\r\nroot<\/span>.<\/span>render<\/span>(<\/span>\r\n  <<\/span>React<\/span>.<\/span>StrictMode<\/span>><\/span>\r\n    <<\/span>App<\/span> \/><\/span>\r\n  <\/<\/span>React<\/span>.<\/span>StrictMode<\/span>><\/span>\r\n);<\/span>\r\n<\/code><\/pre>\n
import<\/span> React<\/span>,<\/span> {<\/span> useRef<\/span> }<\/span> from<\/span> '<\/span>react<\/span>'<\/span>;<\/span>\r\nimport<\/span> {<\/span> useInfinityScroll<\/span> }<\/span> from<\/span> '<\/span>.\/hooks\/useInfinityScroll<\/span>'<\/span>\r\n\r\nfunction<\/span> App<\/span>()<\/span> {<\/span>\r\n  const<\/span> containerRef<\/span> =<\/span> useRef<\/span>(<\/span>null<\/span>);<\/span>\r\n\r\n  const<\/span> fetchData<\/span> =<\/span> async <\/span>(<\/span>page<\/span>:<\/span> number<\/span>)<\/span> =><\/span> {<\/span>\r\n    const<\/span> response<\/span> =<\/span> await<\/span> fetch<\/span>(<\/span>`https:\/\/jsonplaceholder.typicode.com\/posts?_page=<\/span>${<\/span>page<\/span>}<\/span>`<\/span>);<\/span>\r\n    const<\/span> data<\/span> =<\/span> await<\/span> response<\/span>.<\/span>json<\/span>();<\/span>\r\n    return<\/span> data<\/span>;<\/span>\r\n  };<\/span>\r\n\r\n  const<\/span> data<\/span>:<\/span> Post<\/span>[]<\/span> =<\/span> useInfinityScroll<\/span>(<\/span>containerRef<\/span>,<\/span> fetchData<\/span>);<\/span>\r\n\r\n  return <\/span>(<\/span>\r\n    <<\/span>div<\/span>><\/span>\r\n      <<\/span>div<\/span> style<\/span>=<\/span>{<\/span>{<\/span>height<\/span>:<\/span> '<\/span>2000px<\/span>'<\/span>}<\/span>}<\/span>><\/span>\u7121\u9650\u30b9\u30af\u30ed\u30fc\u30eb\u958b\u59cb<\/<\/span>div<\/span>><\/span>\r\n      <<\/span>div<\/span> ref<\/span>=<\/span>{<\/span>containerRef<\/span>}<\/span>><\/span>\r\n        {<\/span>data<\/span>.<\/span>map<\/span>((<\/span>item<\/span>:<\/span> Post<\/span>)<\/span> =><\/span> (<\/span>\r\n          <<\/span>div<\/span> key<\/span>=<\/span>{<\/span>item<\/span>.<\/span>id<\/span>}<\/span>><\/span>\r\n            <<\/span>p<\/span>><\/span>\r\n              {<\/span>item<\/span>.<\/span>id<\/span>}<\/span>\uff1a{<\/span>item<\/span>.<\/span>title<\/span>}<\/span>\r\n            <\/<\/span>p<\/span>><\/span>\r\n          <\/<\/span>div<\/span>><\/span>\r\n        ))<\/span>}<\/span>\r\n      <\/<\/span>div<\/span>><\/span>\r\n    <\/<\/span>div<\/span>><\/span>\r\n  );<\/span>\r\n}<\/span>\r\n\r\nexport<\/span> default<\/span> App<\/span>;<\/span>\r\n\r\ninterface<\/span> Post<\/span> {<\/span>\r\n  userId<\/span>:<\/span> number<\/span>;<\/span>\r\n  id<\/span>:<\/span> number<\/span>;<\/span>\r\n  title<\/span>:<\/span> string<\/span>;<\/span>\r\n  body<\/span>:<\/span> string<\/span>;<\/span>\r\n}<\/span>\r\n\r\n<\/code><\/pre>\n
import<\/span> {<\/span>RefObject<\/span>,<\/span> useCallback<\/span>,<\/span> useEffect<\/span>,<\/span> useState<\/span>}<\/span> from<\/span> '<\/span>react<\/span>'<\/span>;<\/span>\r\n\r\nconst<\/span> options<\/span> =<\/span>{<\/span>\r\n    root<\/span>:<\/span> null<\/span>,<\/span> \/\/ \u30eb\u30fc\u30c8\u8981\u7d20 (viewport) \u3092\u4f7f\u7528<\/span>\r\n    rootMargin<\/span>:<\/span> '<\/span>0px<\/span>'<\/span>,<\/span>\r\n    threshold<\/span>:<\/span> 0<\/span>,<\/span> \/\/ \u8981\u7d20\u304c\u5c11\u3057\u3067\u3082\u30d3\u30e5\u30fc\u30dd\u30fc\u30c8\u306b\u8868\u793a\u3055\u308c\u305f\u77ac\u9593\u304b\u3089\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u304c\u547c\u3073\u51fa\u3055\u308c\u308b<\/span>\r\n}<\/span>\r\n\r\nexport<\/span> const<\/span> useInfinityScroll<\/span> =<\/span> <<\/span>T<\/span>,<\/span>><\/span>(<\/span>ref<\/span>:<\/span> RefObject<\/span><<\/span>HTMLElement<\/span> |<\/span> null<\/span>><\/span>,<\/span> fetch<\/span>:<\/span> (<\/span>page<\/span>:<\/span> number<\/span>)<\/span> =><\/span> Promise<\/span><<\/span>T<\/span>[]<\/span>><\/span>)<\/span> =><\/span> {<\/span>\r\n  const<\/span> [<\/span>data<\/span>,<\/span> setData<\/span>]<\/span> =<\/span> useState<\/span><<\/span>T<\/span>[]<\/span>><\/span>([]);<\/span>\r\n  const<\/span> [<\/span>page<\/span>,<\/span> setPage<\/span>]<\/span> =<\/span> useState<\/span>(<\/span>1<\/span>);<\/span>\r\n  const<\/span> [<\/span>isLoading<\/span>,<\/span> setIsLoading<\/span>]<\/span> =<\/span> useState<\/span>(<\/span>false<\/span>);<\/span> \/\/ \u8aad\u307f\u8fbc\u307f\u4e2d\u306e\u30d5\u30e9\u30b0<\/span>\r\n  const<\/span> [<\/span>hasMoreData<\/span>,<\/span> setHasMoreData<\/span>]<\/span> =<\/span> useState<\/span>(<\/span>true<\/span>);<\/span> \/\/ \u8ffd\u52a0\u30c7\u30fc\u30bf\u304c\u3042\u308b\u304b\u3069\u3046\u304b\u3092\u8ffd\u8de1<\/span>\r\n\r\n  const<\/span> scrollObserver<\/span> =<\/span> useCallback<\/span>(<\/span>\r\n    ()<\/span> =><\/span>\r\n      new<\/span> IntersectionObserver<\/span>((<\/span>entries<\/span>)<\/span> =><\/span> {<\/span>\r\n        console<\/span>.<\/span>log<\/span>(<\/span>'<\/span>entries<\/span>'<\/span>,<\/span> entries<\/span>);<\/span>\r\n        entries<\/span>.<\/span>forEach<\/span>((<\/span>entry<\/span>)<\/span> =><\/span> {<\/span>\r\n          if <\/span>(<\/span>entry<\/span>.<\/span>isIntersecting<\/span> &&<\/span> !<\/span>isLoading<\/span> &&<\/span> hasMoreData<\/span>)<\/span> {<\/span>\r\n            setIsLoading<\/span>(<\/span>true<\/span>);<\/span> \/\/ \u8aad\u307f\u8fbc\u307f\u4e2d\u30d5\u30e9\u30b0\u3092\u8a2d\u5b9a<\/span>\r\n            fetch<\/span>(<\/span>page<\/span>).<\/span>then<\/span>((<\/span>_data<\/span>)<\/span> =><\/span> {<\/span>\r\n              console<\/span>.<\/span>log<\/span>(<\/span>'<\/span>fetch call page<\/span>'<\/span>,<\/span> page<\/span>);<\/span>\r\n              if <\/span>(<\/span>_data<\/span>.<\/span>length<\/span> ><\/span> 0<\/span>)<\/span> {<\/span>\r\n                setPage<\/span>(<\/span>page<\/span> +<\/span> 1<\/span>);<\/span>\r\n                setData<\/span>((<\/span>oldValue<\/span>)<\/span> =><\/span> [...<\/span>oldValue<\/span>,<\/span> ...<\/span>_data<\/span>]);<\/span>\r\n              }<\/span> else<\/span> {<\/span>\r\n                \/\/ \u8ffd\u52a0\u30c7\u30fc\u30bf\u304c\u306a\u3044\u5834\u5408<\/span>\r\n                setHasMoreData<\/span>(<\/span>false<\/span>);<\/span>\r\n              }<\/span>\r\n              setIsLoading<\/span>(<\/span>false<\/span>);<\/span>\r\n            });<\/span>\r\n          }<\/span>\r\n        });<\/span>\r\n      },<\/span>options<\/span>),<\/span>\r\n    [<\/span>page<\/span>,<\/span> fetch<\/span>,<\/span> isLoading<\/span>,<\/span> hasMoreData<\/span>]<\/span>\r\n  );<\/span>\r\n  useEffect<\/span>(()<\/span> =><\/span> {<\/span>\r\n    const<\/span> target<\/span> =<\/span> ref<\/span>.<\/span>current<\/span>;<\/span>\r\n    if <\/span>(<\/span>target<\/span>)<\/span> {<\/span>\r\n      const<\/span> observer<\/span> =<\/span> scrollObserver<\/span>();<\/span>\r\n      observer<\/span>.<\/span>observe<\/span>(<\/span>target<\/span>);<\/span>\r\n      return <\/span>()<\/span> =><\/span> {<\/span>\r\n        observer<\/span>.<\/span>unobserve<\/span>(<\/span>target<\/span>);<\/span>\r\n      };<\/span>\r\n    }<\/span>\r\n  },<\/span> [<\/span>scrollObserver<\/span>,<\/span> ref<\/span>]);<\/span>\r\n\r\n  return<\/span> data<\/span>;<\/span>\r\n};<\/span>\r\n\r\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
\u9996\u5148 \u5982\u6807\u9898\u6240\u8ff0\uff0c\u6211\u4eec\u5c06\u4f7f\u7528React\u6765\u5b9e\u73b0\u65e0\u9650\u6eda\u52a8\u3002\u6211\u4eec\u6ca1\u6709\u4f7f\u7528\u4efb\u4f55\u5e93\uff0c\u800c\u662f\u5229\u7528IntersectionOb […]<\/p>\n","protected":false},"author":10,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-38193","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"\n\u4f7f\u7528React\u5b9e\u73b0\u65e0\u9650\u6eda\u52a8\u3002(\u65e0\u9700\u4efb\u4f55\u624b\u518c\u6216\u5e93) - Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/zh\/blog\/\u4f7f\u7528react\u5b9e\u73b0\u65e0\u9650\u6eda\u52a8\u3002\u65e0\u9700\u4efb\u4f55\u624b\u518c\u6216\u5e93\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u4f7f\u7528React\u5b9e\u73b0\u65e0\u9650\u6eda\u52a8\u3002(\u65e0\u9700\u4efb\u4f55\u624b\u518c\u6216\u5e93)\" \/>\n<meta property=\"og:description\" content=\"\u9996\u5148 \u5982\u6807\u9898\u6240\u8ff0\uff0c\u6211\u4eec\u5c06\u4f7f\u7528React\u6765\u5b9e\u73b0\u65e0\u9650\u6eda\u52a8\u3002\u6211\u4eec\u6ca1\u6709\u4f7f\u7528\u4efb\u4f55\u5e93\uff0c\u800c\u662f\u5229\u7528IntersectionOb […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/zh\/blog\/\u4f7f\u7528react\u5b9e\u73b0\u65e0\u9650\u6eda\u52a8\u3002\u65e0\u9700\u4efb\u4f55\u624b\u518c\u6216\u5e93\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - 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