{"id":38390,"date":"2024-01-06T03:47:31","date_gmt":"2024-01-26T06:23:00","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e9%80%9a%e8%bf%87%e4%bd%bf%e7%94%a8react%e5%92%8cintersectionobserver%e5%ae%9e%e7%8e%b0%e7%9a%84%e4%b8%89%e4%b8%aa%e5%bc%ba%e5%a4%a7%e7%9a%84%e5%8a%9f%e8%83%bd%ef%bc%81\/"},"modified":"2024-05-04T17:05:43","modified_gmt":"2024-05-04T09:05:43","slug":"%e9%80%9a%e8%bf%87%e4%bd%bf%e7%94%a8react%e5%92%8cintersectionobserver%e5%ae%9e%e7%8e%b0%e7%9a%84%e4%b8%89%e4%b8%aa%e5%bc%ba%e5%a4%a7%e7%9a%84%e5%8a%9f%e8%83%bd%ef%bc%81","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e9%80%9a%e8%bf%87%e4%bd%bf%e7%94%a8react%e5%92%8cintersectionobserver%e5%ae%9e%e7%8e%b0%e7%9a%84%e4%b8%89%e4%b8%aa%e5%bc%ba%e5%a4%a7%e7%9a%84%e5%8a%9f%e8%83%bd%ef%bc%81\/","title":{"rendered":"\u901a\u8fc7\u4f7f\u7528React\u548cIntersectionObserver\u5b9e\u73b0\u7684\u4e09\u4e2a\u5f3a\u5927\u7684\u529f\u80fd\uff01"},"content":{"rendered":"

\u6709\u4e00\u4e2aAPI\u53ebIntersectionObserver\uff0c\u5b83\u53ef\u4ee5\u76d1\u89c6\u4e00\u4e2a\u8981\u7d20\u662f\u5426\u5728\u89c6\u53e3\u5185\u3002\u5982\u679c\u5c06\u5b83\u4e0eReact\u7ed3\u5408\u4f7f\u7528\uff0c\u53ef\u4ee5\u663e\u8457\u63d0\u5347\u7528\u6237\u4f53\u9a8c\u3002\u5728\u672c\u6587\u4e2d\uff0c\u6211\u4eec\u5c06\u4ecb\u7ecd\u5982\u4f55\u5145\u5206\u53d1\u6325\u8fd9\u79cd\u7ec4\u5408\u7684\u529b\u91cf\uff01<\/p>\n

\u76ee\u5f55<\/h2>\n
    \n
  1. \n
      IntersectionObserver\u662f\u4ec0\u4e48\uff1f<\/ol>\n<\/li>\n<\/ol>\n

       <\/p>\n

        \n
      1. \n
          \u5728React\u4e2d\u4f7f\u7528IntersectionObserver\u7684\u57fa\u672c\u539f\u7406<\/ol>\n<\/li>\n<\/ol>\n

           <\/p>\n

            \n
          1. \n
              \u5b9e\u8df5\uff01\u4e09\u4e2a\u529f\u80fd<\/ol>\n<\/li>\n<\/ol>\n

              \u5ef6\u8fdf\u52a0\u8f7d
              \n\u65e0\u9650\u6eda\u52a8
              \n\u5e7f\u544a\u5c55\u793a\u7387\u8ba1\u7b97<\/p>\n

              \u603b\u7ed3<\/p>\n

              IntersectionObserver\u662f\u4ec0\u4e48\uff1f<\/h2>\n

              IntersectionObserver\u662f\u4e00\u79cd\u7528\u4e8e\u76d1\u89c6\u7279\u5b9a\u5143\u7d20\u8fdb\u5165\u6216\u79bb\u5f00\u89c6\u53e3\uff08\u663e\u793a\u533a\u57df\uff09\u7684API\u3002\u901a\u8fc7\u8fd9\u79cd\u65b9\u5f0f\uff0c\u53ef\u4ee5\u6709\u6548\u5730\u63a7\u5236\u5143\u7d20\u7684\u663e\u793a\/\u9690\u85cf\uff0c\u5e76\u89e6\u53d1\u7279\u5b9a\u7684\u64cd\u4f5c\u3002<\/p>\n

              \u4f7f\u7528React\u57fa\u672c\u65b9\u6cd5\u4f7f\u7528IntersectionObserver<\/h2>\n

              \u5728\u4f7f\u7528React\u4e2d\u7684IntersectionObserver\u65f6\uff0c\u4e3b\u8981\u662f\u5c06useRef\u548cuseEffect\u7ed3\u5408\u4f7f\u7528\u3002\u901a\u8fc7useRef\u83b7\u53d6DOM\u5143\u7d20\uff0c\u5e76\u5728useEffect\u5185\u8bbe\u7f6e\u4e00\u4e2a\u89c2\u5bdf\u5668\u6765\u76d1\u89c6\u8be5\u5143\u7d20\u3002<\/p>\n

              \u5b9e\u8df5\uff01\u4e09\u4e2a\u7279\u70b9<\/h2>\n

              1. \u60f0\u6027\u52a0\u8f7d<\/h3>\n

              \u61d2\u52a0\u8f7d\u662f\u4e00\u79cd\u6280\u672f\uff0c\u5b83\u4e0d\u662f\u5728\u9875\u9762\u52a0\u8f7d\u65f6\u7acb\u5373\u52a0\u8f7d\u5143\u7d20\uff08\u5c24\u5176\u662f\u56fe\u7247\u548c\u89c6\u9891\uff09\uff0c\u800c\u662f\u5728\u9700\u8981\u65f6\uff08\u4f8b\u5982\uff1a\u6eda\u52a8\u9875\u9762\u4f7f\u5143\u7d20\u63a5\u8fd1\u89c6\u7a97\u65f6\uff09\u8fdb\u884c\u52a0\u8f7d\u3002<\/p>\n

              \u4ee3\u7801\u793a\u4f8b<\/h4>\n
              import<\/span> React<\/span>,<\/span> {<\/span> useState<\/span>,<\/span> useEffect<\/span>,<\/span> useRef<\/span> }<\/span> from<\/span> '<\/span>react<\/span>'<\/span>;<\/span>\r\n\r\nfunction<\/span> LazyImage<\/span>({<\/span> src<\/span>,<\/span> alt<\/span>,<\/span> ...<\/span>props<\/span> })<\/span> {<\/span>\r\n  const<\/span> [<\/span>isLoaded<\/span>,<\/span> setIsLoaded<\/span>]<\/span> =<\/span> useState<\/span>(<\/span>false<\/span>);<\/span>\r\n  const<\/span> imgRef<\/span> =<\/span> useRef<\/span>(<\/span>null<\/span>);<\/span>\r\n\r\n  useEffect<\/span>(()<\/span> =><\/span> {<\/span>\r\n    const<\/span> observer<\/span> =<\/span> new<\/span> IntersectionObserver<\/span>(([<\/span>entry<\/span>])<\/span> =><\/span> {<\/span>\r\n      if <\/span>(<\/span>entry<\/span>.<\/span>isIntersecting<\/span>)<\/span> {<\/span>\r\n        imgRef<\/span>.<\/span>current<\/span>.<\/span>src<\/span> =<\/span> src<\/span>;<\/span>\r\n        imgRef<\/span>.<\/span>current<\/span>.<\/span>onload<\/span> =<\/span> ()<\/span> =><\/span> setIsLoaded<\/span>(<\/span>true<\/span>);<\/span>\r\n        observer<\/span>.<\/span>disconnect<\/span>();<\/span>\r\n      }<\/span>\r\n    });<\/span>\r\n\r\n    observer<\/span>.<\/span>observe<\/span>(<\/span>imgRef<\/span>.<\/span>current<\/span>);<\/span>\r\n\r\n    return <\/span>()<\/span> =><\/span> observer<\/span>.<\/span>disconnect<\/span>();<\/span>\r\n  },<\/span> [<\/span>src<\/span>]);<\/span>\r\n\r\n  return<\/span> <<\/span>img<\/span> ref<\/span>=<\/span>{<\/span>imgRef<\/span>}<\/span> alt<\/span>=<\/span>{<\/span>alt<\/span>}<\/span> {...<\/span>props<\/span>}<\/span> style<\/span>=<\/span>{<\/span>isLoaded<\/span> ?<\/span> {}<\/span> :<\/span> {<\/span> opacity<\/span>:<\/span> 0<\/span> }}<\/span> \/><\/span>;\r\n<\/span>}<\/span>\r\n<\/code><\/pre>\n
              \u89e3\u91ca (ji\u011b sh\u00ec)<\/h4>\n
              useState\u3067\u753b\u50cf\u306e\u8aad\u307f\u8fbc\u307f\u72b6\u614b\u3092\u7ba1\u7406\u3057\u307e\u3059\u3002<\/p>\n
              useRef\u3092\u4f7f\u3063\u3066\u753b\u50cf\u8981\u7d20\u3078\u306e\u53c2\u7167\u3092\u4fdd\u6301\u3057\u307e\u3059\u3002<\/p>\n
              useEffect\u5185\u3067\u3001\u8981\u7d20\u304c\u30d3\u30e5\u30fc\u30dd\u30fc\u30c8\u5185\u306b\u5165\u3063\u305f\u304b\u3069\u3046\u304b\u3092\u76e3\u8996\u3059\u308b\u30aa\u30d6\u30b6\u30fc\u30d0\u30fc\u3092\u8a2d\u5b9a\u3057\u307e\u3059\u3002
              \n\u753b\u50cf\u304c\u30d3\u30e5\u30fc\u30dd\u30fc\u30c8\u5185\u306b\u5165\u308b\u3068\u3001\u5b9f\u969b\u306esrc\u3092\u8a2d\u5b9a\u3057\u3001\u753b\u50cf\u3092\u8aad\u307f\u8fbc\u307f\u307e\u3059\u3002<\/p>\n
              2. \u65e0\u9650\u6eda\u52a8<\/h3>\n
              \u5f53\u6eda\u52a8\u5230\u9875\u9762\u5e95\u90e8\u65f6\uff0c\u4f1a\u81ea\u52a8\u52a0\u8f7d\u4e0b\u4e00\u6bb5\u5185\u5bb9\u7684\u6280\u672f\uff0c\u8fd9\u5728\u793e\u4ea4\u5a92\u4f53\u7b49\u5e73\u53f0\u4e0a\u7ecf\u5e38\u89c1\u5230\u3002<\/p>\n
              \u4ee3\u7801\u793a\u4f8b<\/h4>\n
              import<\/span> React<\/span>,<\/span> {<\/span> useState<\/span>,<\/span> useEffect<\/span>,<\/span> useRef<\/span> }<\/span> from<\/span> '<\/span>react<\/span>'<\/span>;<\/span>\r\n\r\nfunction<\/span> InfinityScroll<\/span>({<\/span> fetchData<\/span> })<\/span> {<\/span>\r\n  const<\/span> [<\/span>items<\/span>,<\/span> setItems<\/span>]<\/span> =<\/span> useState<\/span>([]);<\/span>\r\n  const<\/span> loadingRef<\/span> =<\/span> useRef<\/span>(<\/span>null<\/span>);<\/span>\r\n\r\n  useEffect<\/span>(()<\/span> =><\/span> {<\/span>\r\n    const<\/span> observer<\/span> =<\/span> new<\/span> IntersectionObserver<\/span>(<\/span>async <\/span>([<\/span>entry<\/span>])<\/span> =><\/span> {<\/span>\r\n      if <\/span>(<\/span>entry<\/span>.<\/span>isIntersecting<\/span>)<\/span> {<\/span>\r\n        const<\/span> newItems<\/span> =<\/span> await<\/span> fetchData<\/span>();<\/span>\r\n        setItems<\/span>(<\/span>prevItems<\/span> =><\/span> [...<\/span>prevItems<\/span>,<\/span> ...<\/span>newItems<\/span>]);<\/span>\r\n      }<\/span>\r\n    });<\/span>\r\n\r\n    if <\/span>(<\/span>loadingRef<\/span>.<\/span>current<\/span>)<\/span> {<\/span>\r\n      observer<\/span>.<\/span>observe<\/span>(<\/span>loadingRef<\/span>.<\/span>current<\/span>);<\/span>\r\n    }<\/span>\r\n\r\n    return <\/span>()<\/span> =><\/span> observer<\/span>.<\/span>disconnect<\/span>();<\/span>\r\n  },<\/span> [<\/span>fetchData<\/span>]);<\/span>\r\n\r\n  return <\/span>(<\/span>\r\n    <<\/span>div<\/span>><\/span>\r\n      {<\/span>items<\/span>.<\/span>map<\/span>(<\/span>item<\/span> =><\/span> (<\/span>\r\n        <<\/span>div<\/span> key<\/span>=<\/span>{<\/span>item<\/span>.<\/span>id<\/span>}<\/span>><\/span>{<\/span>item<\/span>.<\/span>name<\/span>}<\/span><<\/span>\/div<\/span>>\r\n<\/span>      ))}<\/span>\r\n      <<\/span>div<\/span> ref<\/span>=<\/span>{<\/span>loadingRef<\/span>}<\/span>><\/span>Loading<\/span>...<\/span><<\/span>\/div<\/span>>\r\n<\/span>    <<\/span>\/div<\/span>>\r\n<\/span>  );<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
              \u8bf4\u660e<\/h4>\n
                \n
              • \n
                  \u8aad\u307f\u8fbc\u307f\u4e2d\u306e\u30b9\u30c6\u30fc\u30bf\u30b9\u3092\u8868\u793a\u3059\u308b\u8981\u7d20\uff08\u3053\u306e\u4f8b\u3067\u306f”Loading…”\uff09\u3092\u76e3\u8996\u3057\u307e\u3059\u3002<\/ul>\n<\/li>\n<\/ul>\n
                   <\/p>\n
                    \u3053\u306e\u8981\u7d20\u304c\u30d3\u30e5\u30fc\u30dd\u30fc\u30c8\u5185\u306b\u5165\u308b\u3068\u3001\u6b21\u306e\u30c7\u30fc\u30bf\u3092\u30d5\u30a7\u30c3\u30c1\u3057\u3001\u65e2\u5b58\u306e\u30a2\u30a4\u30c6\u30e0\u30ea\u30b9\u30c8\u306b\u8ffd\u52a0\u3057\u307e\u3059\u3002<\/ul>\n
                    \u5e7f\u544a\u663e\u793a\u7387\u6d4b\u91cf<\/h3>\n
                    \u6d4b\u91cf\u5e7f\u544a\u5728\u89c6\u53e3\u4e2d\u663e\u793a\u4e86\u591a\u5c11\u65f6\u95f4\u3002\u8fd9\u5728\u5e7f\u544a\u7684\u8ba1\u8d39\u6807\u51c6\u7b49\u65b9\u9762\u53ef\u80fd\u4f1a\u88ab\u4f7f\u7528\u3002<\/p>\n
                    \u793a\u4f8b\u4ee3\u7801<\/h4>\n
                    import<\/span> React<\/span>,<\/span> {<\/span> useEffect<\/span>,<\/span> useRef<\/span> }<\/span> from<\/span> '<\/span>react<\/span>'<\/span>;<\/span>\r\n\r\nfunction<\/span> AdComponent<\/span>({<\/span> src<\/span> })<\/span> {<\/span>\r\n  const<\/span> adRef<\/span> =<\/span> useRef<\/span>(<\/span>null<\/span>);<\/span>\r\n  const<\/span> startTimeRef<\/span> =<\/span> useRef<\/span>(<\/span>null<\/span>);<\/span>\r\n\r\n  useEffect<\/span>(()<\/span> =><\/span> {<\/span>\r\n    const<\/span> observer<\/span> =<\/span> new<\/span> IntersectionObserver<\/span>(([<\/span>entry<\/span>])<\/span> =><\/span> {<\/span>\r\n      if <\/span>(<\/span>entry<\/span>.<\/span>isIntersecting<\/span>)<\/span> {<\/span>\r\n        startTimeRef<\/span>.<\/span>current<\/span> =<\/span> new<\/span> Date<\/span>();<\/span>\r\n      }<\/span> else<\/span> if <\/span>(<\/span>startTimeRef<\/span>.<\/span>current<\/span>)<\/span> {<\/span>\r\n        const<\/span> duration<\/span> =<\/span> new<\/span> Date<\/span>()<\/span> -<\/span> startTimeRef<\/span>.<\/span>current<\/span>;<\/span>\r\n        console<\/span>.<\/span>log<\/span>(<\/span>`Ad was visible for <\/span>${<\/span>duration<\/span>}<\/span>ms`<\/span>);<\/span>\r\n        startTimeRef<\/span>.<\/span>current<\/span> =<\/span> null<\/span>;<\/span>\r\n      }<\/span>\r\n    });<\/span>\r\n\r\n    if <\/span>(<\/span>adRef<\/span>.<\/span>current<\/span>)<\/span> {<\/span>\r\n      observer<\/span>.<\/span>observe<\/span>(<\/span>adRef<\/span>.<\/span>current<\/span>);<\/span>\r\n    }<\/span>\r\n\r\n    return <\/span>()<\/span> =><\/span> observer<\/span>.<\/span>disconnect<\/span>();<\/span>\r\n  },<\/span> []);<\/span>\r\n\r\n  return<\/span> <<\/span>img<\/span> ref<\/span>=<\/span>{<\/span>adRef<\/span>}<\/span> src<\/span>=<\/span>{<\/span>src<\/span>}<\/span> alt<\/span>=<\/span>\"<\/span>Advertisement<\/span>\"<\/span> \/><\/span>;<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
                    \u8bf4\u660e<\/h4>\n
                      \n
                    • \n
                        \u5e83\u544a\u304c\u30d3\u30e5\u30fc\u30dd\u30fc\u30c8\u306b\u8868\u793a\u3055\u308c\u305f\u958b\u59cb\u6642\u9593\u3092\u8a18\u9332\u3057\u307e\u3059\u3002<\/ul>\n<\/li>\n<\/ul>\n
                         <\/p>\n
                          \u5e83\u544a\u304c\u30d3\u30e5\u30fc\u30dd\u30fc\u30c8\u304b\u3089\u51fa\u308b\u3068\u3001\u8868\u793a\u3055\u308c\u305f\u6642\u9593\u3092\u8a08\u7b97\u3057\u3001\u305d\u308c\u3092\u30ed\u30b0\u306b\u51fa\u529b\u3057\u307e\u3059\u3002<\/ul>\n
                          \u603b\u7ed3<\/h2>\n
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