{"id":38631,"date":"2023-09-10T00:20:18","date_gmt":"2023-10-17T22:26:15","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%9b%9e%e5%ba%94%e7%ac%94%e8%ae%b0\/"},"modified":"2024-05-03T23:00:31","modified_gmt":"2024-05-03T15:00:31","slug":"%e5%9b%9e%e5%ba%94%e7%ac%94%e8%ae%b0","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%9b%9e%e5%ba%94%e7%ac%94%e8%ae%b0\/","title":{"rendered":"\u56de\u5e94\u7b14\u8bb0"},"content":{"rendered":"

\u6b63\u5219\u8868\u8fbe\u5f0f\u5339\u914d\u6587\u5b57\u548c\u6570\u5b57\u7ec4\u6210\u7684id\u3002<\/p>\n

const<\/span> idRegex<\/span> =<\/span> \/timePairId-<\/span>\\d<\/span>\/g<\/span>\r\nconst<\/span> result_id<\/span> =<\/span> timeAthtml<\/span>.<\/span>match<\/span>(<\/span>idRegex<\/span>)<\/span>\r\n<\/code><\/pre>\n
\u4f7f\u7528querySelectorAll\u65b9\u6cd5\u4ece\u591a\u4e2a\u5177\u6709\u76f8\u540cid\u7684\u5143\u7d20\u4e2d\u83b7\u53d6\u503c\u3002<\/p>\n
    const<\/span> Array<\/span> =<\/span> []<\/span>\r\n    const<\/span> Selector<\/span> =<\/span> document<\/span>.<\/span>querySelectorAll<\/span>(<\/span>'<\/span>[id^=dateAndTimeAt__Item]<\/span>'<\/span>)<\/span>\r\n    for<\/span> (<\/span>let<\/span> i<\/span> =<\/span> 0<\/span>;<\/span> i<\/span> <<\/span> Selector<\/span>.<\/span>length<\/span>;<\/span> i<\/span>++<\/span>)<\/span> {<\/span>\r\n      const<\/span> target<\/span> =<\/span> Selector<\/span>[<\/span>i<\/span>].<\/span>innerHTML<\/span>\r\n      const<\/span> result<\/span> =<\/span> target<\/span>.<\/span>match<\/span>(<\/span>\u6b63\u898f\u8868\u73fe<\/span>)<\/span>\r\n      Array<\/span>.<\/span>push<\/span>(<\/span>String<\/span>(<\/span>result<\/span>))<\/span>\r\n    }<\/span>\r\n<\/code><\/pre>\n
\u4f7f\u7528querySelectorAll\u4ece\u591a\u4e2a\u5177\u6709\u76f8\u540cid\u7684\u5143\u7d20\u4e2d\u83b7\u53d6\u503c\u3010\u5173\u8054\u6570\u7ec4\u3011\u3002<\/p>\n
    const<\/span> Array<\/span> =<\/span> []<\/span>\r\n    const<\/span> Braces<\/span> =<\/span> {}<\/span>\r\n    const<\/span> Selector<\/span> =<\/span> document<\/span>.<\/span>querySelectorAll<\/span>(<\/span>'<\/span>[id^=dateAndTimeAt__Item]<\/span>'<\/span>)<\/span>\r\n    for<\/span> (<\/span>let<\/span> i<\/span> =<\/span> 0<\/span>;<\/span> i<\/span> <<\/span> Selector<\/span>.<\/span>length<\/span>;<\/span> i<\/span>++<\/span>)<\/span> {<\/span>\r\n      const<\/span> target<\/span> =<\/span> Selector<\/span>[<\/span>i<\/span>].<\/span>innerHTML<\/span>\r\n      const<\/span> result<\/span> =<\/span> target<\/span>.<\/span>match<\/span>(<\/span>\u6b63\u898f\u8868\u73fe<\/span>)<\/span>\r\n      Array<\/span>[<\/span>'<\/span>name<\/span>'<\/span>]<\/span> =<\/span> result<\/span>[<\/span>0<\/span> +<\/span> i<\/span>]<\/span>\r\n      Array<\/span>[<\/span>'<\/span>email<\/span>'<\/span>]<\/span> =<\/span> result<\/span>[<\/span>1<\/span> +<\/span> i<\/span>]<\/span>\r\n      Array<\/span>[<\/span>'<\/span>pass<\/span>'<\/span>]<\/span> =<\/span> result<\/span>[<\/span>2<\/span> +<\/span> i<\/span>]<\/span>\r\n      Braces<\/span>.<\/span>push<\/span>(<\/span>Array<\/span>)<\/span>\r\n    }<\/span>\r\n<\/code><\/pre>\n
\u6211\u4e0d\u60f3\u5728\u521d\u59cb\u4f7f\u7528useEffect\u3002<\/p>\n
\/\/ useEffect\u3092\u521d\u56de\u306b\u4f7f\u7528\u3057\u305f\u304f\u306a\u3044\u306e\u3067useRef\u3092\u4f7f\u7528<\/span>\r\nconst<\/span> isFirstRender<\/span> =<\/span> useRef<\/span>(<\/span>false<\/span>)<\/span>\r\n\/\/ \u521d\u56de\u3060\u3063\u305f\u3089isFirstRender\u306btrue\u3092\u5165\u308c\u308b<\/span>\r\nuseEffect<\/span>(()<\/span> =><\/span> {<\/span>\r\n  isFirstRender<\/span>.<\/span>current<\/span> =<\/span> true<\/span>\r\n},<\/span> [])<\/span>\r\n\/\/ useEffect<\/span>\r\n  useEffect<\/span>(()<\/span> =><\/span> {<\/span>\r\n    if<\/span> (<\/span>isFirstRender<\/span>.<\/span>current<\/span>)<\/span> {<\/span>\r\n      isFirstRender<\/span>.<\/span>current<\/span> =<\/span> false<\/span>\r\n    }<\/span> else<\/span> {<\/span>\r\n    }<\/span>\r\n    })<\/span>\r\n<\/code><\/pre>\n
\u60f3\u8981\u5728 React \u7684 useEffect \u4e2d\u4f7f\u7528\u591a\u4e2a\u53c2\u6570\u6765\u89e6\u53d1<\/p>\n
\u4f8b<\/span>\r\nconst<\/span> [<\/span>hasAaa<\/span>,<\/span> setAaa<\/span>]<\/span> =<\/span> useState<\/span>(<\/span>0<\/span>)<\/span>\r\nconst<\/span> [<\/span>hasBbb<\/span>,<\/span> setBbb<\/span>]<\/span> =<\/span> useState<\/span>(<\/span>0<\/span>)<\/span>\r\nconst<\/span> [<\/span>hasCcc<\/span>,<\/span> setCcc<\/span>]<\/span> =<\/span> useState<\/span>(<\/span>0<\/span>)<\/span>\r\nuseEffect<\/span>(()<\/span> =><\/span> {<\/span>\r\n  console<\/span>.<\/span>log<\/span>(<\/span>\"<\/span>@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@<\/span>\"<\/span>)<\/span>\r\n},<\/span> [<\/span>hasAaa<\/span>,<\/span> hasBbb<\/span>,<\/span> hasCcc<\/span>])<\/span>\r\n<\/code><\/pre>\n
\u68c0\u67e5\u6570\u7ec4\u5143\u7d20\u662f\u5426\u91cd\u590d\u3010JS\u3011<\/p>\n
\u53c2\u8003<\/span>\r\n\u524d\u63d0<\/span>\r\n\u914d\u5217\u306e\u4e2d\u306e\u8981\u7d20\u306f<\/span>\u3001\u300c\u201c\u201d\u300d<\/span>\u306e\u6587\u5b57\u5217\u8981\u7d20\u3067\u3042\u308b\u5fc5\u8981\u304c\u3042\u308b<\/span>\r\nconst<\/span> array<\/span> =<\/span> [<\/span>\"<\/span>aaa<\/span>\"<\/span>,<\/span> \"<\/span>bbb<\/span>\"<\/span>,<\/span> \"<\/span>bbb<\/span>\"<\/span>,<\/span> \"<\/span>ccc<\/span>\"<\/span>]<\/span>\r\nconst<\/span> DuplicateCheck<\/span> =<\/span> array<\/span>.<\/span>filter<\/span>(<\/span>function<\/span> (<\/span>x<\/span>,<\/span> i<\/span>,<\/span> self<\/span>)<\/span> {<\/span>\r\n  return<\/span> self<\/span>.<\/span>indexOf<\/span>(<\/span>x<\/span>)<\/span> !==<\/span> self<\/span>.<\/span>lastIndexOf<\/span>(<\/span>x<\/span>)<\/span>\r\n})<\/span>\r\nconsole<\/span>.<\/span>log<\/span>(<\/span>DuplicateCheck<\/span>)<\/span>\r\n<\/code><\/pre>\n
\u4f7f\u7528React\u7684useMemo\u6765\u8df3\u8fc7\u7ec4\u4ef6\u7684\u91cd\u65b0\u6e32\u67d3\u3002<\/p>\n
\u53c2\u8003<\/span>\r\nimport<\/span> React<\/span>,<\/span> {<\/span> useState<\/span>,<\/span> useMemo<\/span> }<\/span> from<\/span> \"<\/span>react<\/span>\"<\/span>;<\/span>\r\nexport<\/span> default<\/span> function<\/span> App<\/span>()<\/span> {<\/span>\r\n  const<\/span> [<\/span>count1<\/span>,<\/span> setCount1<\/span>]<\/span> =<\/span> useState<\/span>(<\/span>0<\/span>);<\/span>\r\n  const<\/span> [<\/span>count2<\/span>,<\/span> setCount2<\/span>]<\/span> =<\/span> useState<\/span>(<\/span>0<\/span>);<\/span>\r\n  \/\/ \u5f15\u6570\u306e\u6570\u5024\u3092\uff12\u500d\u306b\u3057\u3066\u8fd4\u3059\u3002<\/span>\r\n  \/\/ \u4e0d\u8981\u306a\u30eb\u30fc\u30d7\u3092\u5b9f\u884c\u3057\u3066\u3044\u308b\u305f\u3081\u8a08\u7b97\u306b\u304b\u306a\u308a\u306e\u6642\u9593\u304c\u304b\u304b\u308b\u3002<\/span>\r\n  const<\/span> double<\/span> =<\/span> count<\/span> =><\/span> {<\/span>\r\n    let<\/span> i<\/span> =<\/span> 0<\/span>;<\/span>\r\n    while<\/span> (<\/span>i<\/span> <<\/span> 1000000000<\/span>)<\/span> i<\/span>++<\/span>;<\/span>\r\n    return<\/span> count<\/span> *<\/span> 2<\/span>;<\/span>\r\n  };<\/span>\r\n  \/\/ count2 \u3092\uff12\u500d\u306b\u3057\u305f\u5024\u3092\u30e1\u30e2\u5316\u3059\u308b\u3002<\/span>\r\n  \/\/ \u7b2c\uff12\u5f15\u6570\u306b count2 \u3092\u6e21\u3057\u3066\u3044\u308b\u305f\u3081\u3001count2 \u304c\u66f4\u65b0\u3055\u308c\u305f\u6642\u3060\u3051\u5024\u304c\u518d\u8a08\u7b97\u3055\u308c\u308b\u3002<\/span>\r\n  \/\/ count1 \u304c\u66f4\u65b0\u3055\u308c\u3001\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u304c\u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3055\u308c\u305f\u6642\u306f\u30e1\u30e2\u5316\u3057\u305f\u5024\u3092\u5229\u7528\u3059\u308b\u305f\u3081\u518d\u8a08\u7b97\u3055\u308c\u306a\u3044\u3002<\/span>\r\n  const<\/span> doubledCount<\/span> =<\/span> useMemo<\/span>(()<\/span> =><\/span> double<\/span>(<\/span>count2<\/span>),<\/span> [<\/span>count2<\/span>]);<\/span>\r\n  return<\/span> (<\/span>\r\n    <><\/span>\r\n      <<\/span>h2<\/span>><\/span>Increment<\/span>(<\/span>fast<\/span>)<\/span><<\/span>\/h2<\/span>>\r\n<\/span>      <<\/span>p<\/span>><\/span>Counter<\/span>:<\/span> {<\/span>count1<\/span>}<\/span><<\/span>\/p<\/span>>\r\n<\/span>      <<\/span>button<\/span> onClick<\/span>=<\/span>{()<\/span> =><\/span> setCount1<\/span>(<\/span>count1<\/span> +<\/span> 1<\/span>)}<\/span>><\/span>Increment<\/span>(<\/span>fast<\/span>)<\/span><<\/span>\/button<\/span>>\r\n<\/span>      <<\/span>h2<\/span>><\/span>Increment<\/span>(<\/span>slow<\/span>)<\/span><<\/span>\/h2<\/span>>\r\n<\/span>      <<\/span>p<\/span>><\/span>\r\n        Counter<\/span>:<\/span> {<\/span>count2<\/span>},<\/span> {<\/span>doubledCount<\/span>}<\/span>\r\n      <<\/span>\/p<\/span>>\r\n<\/span>      <<\/span>button<\/span> onClick<\/span>=<\/span>{()<\/span> =><\/span> setCount2<\/span>(<\/span>count2<\/span> +<\/span> 1<\/span>)}<\/span>><\/span>Increment<\/span>(<\/span>slow<\/span>)<\/span><<\/span>\/button<\/span>>\r\n<\/span>    <<\/span>\/<\/span>>\r\n<\/span>  );<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u53cd\u5e94\u54cd\u5e94\u65f6\u63a5\u6536\u5173\u8054\u6570\u7ec4\u3002<\/p>\n
const<\/span> tasks<\/span> =<\/span> [<\/span>\r\n  {<\/span> id<\/span>:<\/span> 1<\/span>,<\/span> title<\/span>:<\/span> \"<\/span>one<\/span>\"<\/span> },<\/span>\r\n  {<\/span> id<\/span>:<\/span> 2<\/span>,<\/span> title<\/span>:<\/span> \"<\/span>two<\/span>\"<\/span> },<\/span>\r\n  {<\/span> id<\/span>:<\/span> 3<\/span>,<\/span> title<\/span>:<\/span> \"<\/span>three<\/span>\"<\/span> },<\/span>\r\n  {<\/span> id<\/span>:<\/span> 4<\/span>,<\/span> title<\/span>:<\/span> \"<\/span>four<\/span>\"<\/span> },<\/span>\r\n  {<\/span> id<\/span>:<\/span> 5<\/span>,<\/span> title<\/span>:<\/span> \"<\/span>five<\/span>\"<\/span> }<\/span>\r\n];<\/span>\r\nconst<\/span> list<\/span> =<\/span> tasks<\/span>.<\/span>map<\/span>(<\/span>task<\/span> =><\/span> {<\/span>\r\n  console<\/span>.<\/span>log<\/span>(<\/span>task<\/span>.<\/span>id<\/span>)<\/span>\r\n  console<\/span>.<\/span>log<\/span>(<\/span>task<\/span>.<\/span>title<\/span>)<\/span>\r\n});<\/span>\r\n<\/code><\/pre>\n
\u521b\u5efaReact\u5173\u8054\u6570\u7ec4<\/p>\n
const<\/span> Array<\/span> =<\/span> []<\/span>\r\nconst<\/span> Braces<\/span> =<\/span> {}<\/span>\r\nconst<\/span> xxxxxxxxx<\/span> =<\/span>  hasDateAndTimeAtItems<\/span>.<\/span>map<\/span>(<\/span>item<\/span> =><\/span> {<\/span>\r\n    Braces<\/span>[<\/span>'<\/span>date<\/span>'<\/span>]<\/span> =<\/span> item<\/span>[<\/span>0<\/span>]<\/span>\r\n    Braces<\/span>[<\/span>'<\/span>startAt<\/span>'<\/span>]<\/span> =<\/span> item<\/span>[<\/span>1<\/span>]<\/span>\r\n    Braces<\/span>[<\/span>'<\/span>endAt<\/span>'<\/span>]<\/span> =<\/span> item<\/span>[<\/span>2<\/span>]<\/span>\r\n    Array<\/span>.<\/span>push<\/span>(<\/span>Braces<\/span>)<\/span>\r\n    return<\/span> (<\/span>Array<\/span>)<\/span>\r\n  })<\/span>\r\nconsole<\/span>.<\/span>log<\/span>(<\/span>xxxxxxxxx<\/span>)<\/span>\r\nlet<\/span> wrongMap<\/span> =<\/span> new<\/span> Map<\/span>()<\/span>\r\nwrongMap<\/span>[<\/span>'<\/span>bla<\/span>'<\/span>]<\/span> =<\/span> '<\/span>blaa<\/span>'<\/span>\r\nwrongMap<\/span>[<\/span>'<\/span>bla2<\/span>'<\/span>]<\/span> =<\/span> '<\/span>blaaa2<\/span>'<\/span>\r\nconsole<\/span>.<\/span>log<\/span>(<\/span>wrongMap<\/span>)<\/span>  \/\/ Map { bla: 'blaa', bla2: 'blaaa2' }<\/span>\r\n<\/code><\/pre>\n
\u521b\u5efa\u53cd\u5e94\u6620\u5c04(\u8fde\u60f3\u6570\u7ec4)<\/p>\n
      const<\/span> associativeArrayConvert<\/span> =<\/span> hasDateAndTimeAtItems<\/span>.<\/span>map<\/span>(<\/span>item<\/span> =><\/span> {<\/span>\r\n        const<\/span> itemMap<\/span> =<\/span> {<\/span>\r\n          date<\/span>:<\/span> item<\/span>[<\/span>0<\/span>],<\/span>\r\n          startAt<\/span>:<\/span> item<\/span>[<\/span>1<\/span>],<\/span>\r\n          endAt<\/span>:<\/span> item<\/span>[<\/span>2<\/span>]<\/span>\r\n        }<\/span>\r\n        return<\/span> itemMap<\/span>\r\n      })<\/span>\r\nconsole<\/span>.<\/span>log<\/span>(<\/span>associativeArrayConvert<\/span>)<\/span>\r\n<\/code><\/pre>\n
React Map (\u8fde\u60f3\u6570\u7ec4) \u63a5\u6536 \u83b7\u53d6 \u63d0\u53d6<\/p>\n
      associativeArrayConvert<\/span>.<\/span>map<\/span>((<\/span>item<\/span>,<\/span> index<\/span>)<\/span> =><\/span> {<\/span>\r\n        console<\/span>.<\/span>log<\/span>(<\/span>item<\/span>.<\/span>startAt<\/span>)<\/span>\r\n      });<\/span>\r\n<\/code><\/pre>\n
\u521b\u5efa\u952e\u503c\u5bf9\uff0c\u5e76\u4f7f\u7528React\u7684setState\u65b9\u6cd5\u8bbe\u7f6e\u503c\u7684\u65b9\u6cd5<\/p>\n
const<\/span> [<\/span>productQuantity<\/span>,<\/span> setProductQuantity<\/span>]<\/span> =<\/span> useState<\/span>({});<\/span>\r\nconst<\/span> handleQuantity<\/span> =<\/span> (<\/span>e<\/span>,<\/span> id<\/span>)<\/span> =><\/span> {<\/span>\r\n  setProductQuantity<\/span>((<\/span>currentQuantity<\/span>)<\/span> =><\/span> ({<\/span>\r\n    ...<\/span>currentQuantity<\/span>,<\/span>\r\n    [<\/span>id<\/span>]:<\/span> e<\/span>.<\/span>target<\/span>.<\/span>value<\/span>,<\/span>\r\n  }));<\/span>\r\n};<\/span>\r\n<\/code><\/pre>\n
\u590d\u5236Object \uff08\u514b\u9686\uff09<\/p>\n
let<\/span> user<\/span> =<\/span> {<\/span>firstName<\/span>:<\/span> '<\/span>John<\/span>'<\/span>,<\/span> lastName<\/span>:<\/span> '<\/span>Doe<\/span>'<\/span> };<\/span>\r\nlet<\/span> user_clone<\/span> =<\/span> Object<\/span>.<\/span>assign<\/span>({},<\/span> user<\/span>);<\/span>\r\n<\/code><\/pre>\n
\u5408\u5e76\u4e24\u4e2a\u5bf9\u8c61\u6570\u7ec4\u3002<\/p>\n
const<\/span> mergeByProperty<\/span> =<\/span> (<\/span>target<\/span>,<\/span> source<\/span>,<\/span> prop<\/span>)<\/span> =><\/span> {<\/span>\r\n  source<\/span>.<\/span>forEach<\/span>(<\/span>sourceElement<\/span> =><\/span> {<\/span>\r\n    let<\/span> targetElement<\/span> =<\/span> target<\/span>.<\/span>find<\/span>(<\/span>targetElement<\/span> =><\/span> {<\/span>\r\n      return<\/span> sourceElement<\/span>[<\/span>prop<\/span>]<\/span> ===<\/span> targetElement<\/span>[<\/span>prop<\/span>];<\/span>\r\n    })<\/span>\r\n    targetElement<\/span> ?<\/span> Object<\/span>.<\/span>assign<\/span>(<\/span>targetElement<\/span>,<\/span> sourceElement<\/span>)<\/span> :<\/span> target<\/span>.<\/span>push<\/span>(<\/span>sourceElement<\/span>);<\/span>\r\n  })<\/span>\r\n}<\/span>\r\nvar<\/span> target<\/span> \/* arr1 *\/<\/span> =<\/span> [{<\/span>name<\/span>:<\/span> \"<\/span>lang<\/span>\"<\/span>,<\/span> value<\/span>:<\/span> \"<\/span>English<\/span>\"<\/span>},<\/span> {<\/span>name<\/span>:<\/span> \"<\/span>age<\/span>\"<\/span>,<\/span> value<\/span>:<\/span> \"<\/span>18<\/span>\"<\/span>}];<\/span>\r\nvar<\/span> source<\/span> \/* arr2 *\/<\/span> =<\/span> [{<\/span>name<\/span> :<\/span> \"<\/span>childs<\/span>\"<\/span>,<\/span> value<\/span>:<\/span> '<\/span>5<\/span>'<\/span>},<\/span> {<\/span>name<\/span>:<\/span> \"<\/span>lang<\/span>\"<\/span>,<\/span> value<\/span>:<\/span> \"<\/span>German<\/span>\"<\/span>}];<\/span>\r\nmergeByProperty<\/span>(<\/span>target<\/span>,<\/span> source<\/span>,<\/span> '<\/span>name<\/span>'<\/span>);<\/span>\r\nconsole<\/span>.<\/span>log<\/span>(<\/span>target<\/span>)<\/span>\r\n<\/code><\/pre>\n
\u6839\u636e\u6307\u5b9a\u7684\u7d22\u5f15\u5220\u9664\u6570\u7ec4\u5143\u7d20\u3002<\/p>\n
function<\/span> removeItemOnce<\/span>(<\/span>arr<\/span>,<\/span> value<\/span>)<\/span> {<\/span>\r\n  var<\/span> index<\/span> =<\/span> arr<\/span>.<\/span>indexOf<\/span>(<\/span>value<\/span>);<\/span>\r\n  if<\/span> (<\/span>index<\/span> ><\/span> -<\/span>1<\/span>)<\/span> {<\/span>\r\n    arr<\/span>.<\/span>splice<\/span>(<\/span>index<\/span>,<\/span> 1<\/span>);<\/span>\r\n  }<\/span>\r\n  return<\/span> arr<\/span>;<\/span>\r\n}<\/span>\r\nconsole<\/span>.<\/span>log<\/span>(<\/span>removeItemOnce<\/span>([<\/span>2<\/span>,<\/span>5<\/span>,<\/span>9<\/span>,<\/span>1<\/span>,<\/span>5<\/span>,<\/span>8<\/span>,<\/span>5<\/span>],<\/span> 5<\/span>))<\/span>\r\n[<\/span>\r\n  2<\/span>,<\/span>\r\n  9<\/span>,<\/span>\r\n  1<\/span>,<\/span>\r\n  5<\/span>,<\/span>\r\n  8<\/span>,<\/span>\r\n  5<\/span>\r\n]<\/span>\r\n\u8ffd\u52a0<\/span>\r\nvar<\/span> value<\/span> =<\/span> 3<\/span>\r\nvar<\/span> arr<\/span> =<\/span> [<\/span>1<\/span>,<\/span> 2<\/span>,<\/span> 3<\/span>,<\/span> 4<\/span>,<\/span> 5<\/span>,<\/span> 3<\/span>]<\/span>\r\narr<\/span> =<\/span> arr<\/span>.<\/span>filter<\/span>(<\/span>function<\/span>(<\/span>item<\/span>)<\/span> {<\/span>\r\n    return<\/span> item<\/span> !==<\/span> value<\/span>\r\n})<\/span>\r\nconsole<\/span>.<\/span>log<\/span>(<\/span>arr<\/span>)<\/span>\r\n[<\/span> 1<\/span>,<\/span> 2<\/span>,<\/span> 4<\/span>,<\/span> 5<\/span> ]<\/span>\r\n<\/code><\/pre>\n
\u5982\u4f55\u4ece\u6570\u7ec4\u4e2d\u5220\u9664\u7279\u5b9a\u5143\u7d20\uff1f<\/p>\n
\uff08Note: The given question is already in Japanese, not Chinese. However, I have provided the requested paraphrase in Chinese.)<\/p>\n
function<\/span> removeItemAll<\/span>(<\/span>arr<\/span>,<\/span> value<\/span>)<\/span> {<\/span>\r\n  var<\/span> i<\/span> =<\/span> 0<\/span>;<\/span>\r\n  while<\/span> (<\/span>i<\/span> <<\/span> arr<\/span>.<\/span>length<\/span>)<\/span> {<\/span>\r\n    if<\/span> (<\/span>arr<\/span>[<\/span>i<\/span>]<\/span> ===<\/span> value<\/span>)<\/span> {<\/span>\r\n      arr<\/span>.<\/span>splice<\/span>(<\/span>i<\/span>,<\/span> 1<\/span>);<\/span>\r\n    }<\/span> else<\/span> {<\/span>\r\n      ++<\/span>i<\/span>;<\/span>\r\n    }<\/span>\r\n  }<\/span>\r\n  return<\/span> arr<\/span>;<\/span>\r\n}<\/span>\r\nconsole<\/span>.<\/span>log<\/span>(<\/span>removeItemAll<\/span>([<\/span>2<\/span>,<\/span>5<\/span>,<\/span>9<\/span>,<\/span>1<\/span>,<\/span>5<\/span>,<\/span>8<\/span>,<\/span>5<\/span>],<\/span> 5<\/span>))<\/span>\r\n[<\/span>\r\n  2<\/span>,<\/span>\r\n  9<\/span>,<\/span>\r\n  1<\/span>,<\/span>\r\n  8<\/span>\r\n]<\/span>\r\n\u8ffd\u52a0<\/span>\r\nlet<\/span> value<\/span> =<\/span> 3<\/span>\r\nlet<\/span> arr<\/span> =<\/span> [<\/span>1<\/span>,<\/span> 2<\/span>,<\/span> 3<\/span>,<\/span> 4<\/span>,<\/span> 5<\/span>,<\/span> 3<\/span>]<\/span>\r\narr<\/span> =<\/span> arr<\/span>.<\/span>filter<\/span>(<\/span>item<\/span> =><\/span> item<\/span> !==<\/span> value<\/span>)<\/span>\r\nconsole<\/span>.<\/span>log<\/span>(<\/span>arr<\/span>)<\/span>\r\n[<\/span> 1<\/span>,<\/span> 2<\/span>,<\/span> 4<\/span>,<\/span> 5<\/span> ]<\/span>\r\n<\/code><\/pre>\n
\u7528\u5bf9\u8c61\u6765\u7ba1\u7406\u72b6\u6001\uff08\u5305\u62ec\u6dfb\u52a0\u548c\u5220\u9664\uff09\u3002<\/p>\n
https<\/span>:<\/span>\/\/stackblitz.com\/edit\/dynamic-input-fields-reactjs-kqbrx3?file=src%2FApp.js<\/span>\r\nimport<\/span> React<\/span>,<\/span> {<\/span> useState<\/span> }<\/span> from<\/span> \"<\/span>react<\/span>\"<\/span>;<\/span>\r\nfunction<\/span> App<\/span>()<\/span> {<\/span>\r\n  const<\/span> [<\/span>inputList<\/span>,<\/span> setInputList<\/span>]<\/span> =<\/span> useState<\/span>([{<\/span> firstName<\/span>:<\/span> \"\"<\/span>,<\/span> lastName<\/span>:<\/span> \"\"<\/span> }]);<\/span>\r\n  \/\/ handle input change<\/span>\r\n  const<\/span> handleInputChange<\/span> =<\/span> (<\/span>e<\/span>,<\/span> index<\/span>)<\/span> =><\/span> {<\/span>\r\n    console<\/span>.<\/span>log<\/span>(<\/span>\"<\/span>e.target<\/span>\"<\/span>,<\/span> e<\/span>.<\/span>target<\/span>)<\/span>\r\n    const<\/span> {<\/span> name<\/span>,<\/span> value<\/span> }<\/span> =<\/span> e<\/span>.<\/span>target<\/span>;<\/span>\r\n    const<\/span> list<\/span> =<\/span> [...<\/span>inputList<\/span>];<\/span>\r\n    list<\/span>[<\/span>index<\/span>][<\/span>name<\/span>]<\/span> =<\/span> value<\/span>;<\/span>\r\n    setInputList<\/span>(<\/span>list<\/span>);<\/span>\r\n  };<\/span>\r\n  \/\/ handle click event of the Remove button<\/span>\r\n  const<\/span> handleRemoveClick<\/span> =<\/span> index<\/span> =><\/span> {<\/span>\r\n    const<\/span> list<\/span> =<\/span> [...<\/span>inputList<\/span>];<\/span>\r\n    list<\/span>.<\/span>splice<\/span>(<\/span>index<\/span>,<\/span> 1<\/span>);<\/span>\r\n    setInputList<\/span>(<\/span>list<\/span>);<\/span>\r\n  };<\/span>\r\n  \/\/ handle click event of the Add button<\/span>\r\n  const<\/span> handleAddClick<\/span> =<\/span> ()<\/span> =><\/span> {<\/span>\r\n    setInputList<\/span>([...<\/span>inputList<\/span>,<\/span> {<\/span> firstName<\/span>:<\/span> \"\"<\/span>,<\/span> lastName<\/span>:<\/span> \"\"<\/span> }]);<\/span>\r\n  };<\/span>\r\n  return<\/span> (<\/span>\r\n    <<\/span>div<\/span> className<\/span>=<\/span>\"<\/span>App<\/span>\"<\/span>><\/span>\r\n      <<\/span>h3<\/span>><<\/span>a<\/span> href<\/span>=<\/span>\"<\/span>https:\/\/cluemediator.com<\/span>\"<\/span>><\/span>Clue<\/span> Mediator<\/span><<\/span>\/a><\/<\/span>h3<\/span>><\/span>\r\n      {<\/span>inputList<\/span>.<\/span>map<\/span>((<\/span>x<\/span>,<\/span> i<\/span>)<\/span> =><\/span> {<\/span>\r\n        return<\/span> (<\/span>\r\n          <<\/span>div<\/span> className<\/span>=<\/span>\"<\/span>box<\/span>\"<\/span>><\/span>\r\n            <<\/span>input<\/span>\r\n              name<\/span>=<\/span>\"<\/span>firstName<\/span>\"<\/span>\r\n              placeholder<\/span>=<\/span>\"<\/span>Enter First Name<\/span>\"<\/span>\r\n              value<\/span>=<\/span>{<\/span>x<\/span>.<\/span>firstName<\/span>}<\/span>\r\n              onChange<\/span>=<\/span>{<\/span>e<\/span> =><\/span> handleInputChange<\/span>(<\/span>e<\/span>,<\/span> i<\/span>)}<\/span>\r\n            \/<\/span>>\r\n<\/span>            <<\/span>input<\/span>\r\n              className<\/span>=<\/span>\"<\/span>ml10<\/span>\"<\/span>\r\n              name<\/span>=<\/span>\"<\/span>lastName<\/span>\"<\/span>\r\n              placeholder<\/span>=<\/span>\"<\/span>Enter Last Name<\/span>\"<\/span>\r\n              value<\/span>=<\/span>{<\/span>x<\/span>.<\/span>lastName<\/span>}<\/span>\r\n              onChange<\/span>=<\/span>{<\/span>e<\/span> =><\/span> handleInputChange<\/span>(<\/span>e<\/span>,<\/span> i<\/span>)}<\/span>\r\n            \/<\/span>>\r\n<\/span>            <<\/span>div<\/span> className<\/span>=<\/span>\"<\/span>btn-box<\/span>\"<\/span>><\/span>\r\n              {<\/span>inputList<\/span>.<\/span>length<\/span> !==<\/span> 1<\/span> &&<\/span> <<\/span>button<\/span>\r\n                className<\/span>=<\/span>\"<\/span>mr10<\/span>\"<\/span>\r\n                onClick<\/span>=<\/span>{()<\/span> =><\/span> handleRemoveClick<\/span>(<\/span>i<\/span>)}<\/span>><\/span>Remove<\/span><<\/span>\/button><\/span>}\r\n<\/span>              {<\/span>inputList<\/span>.<\/span>length<\/span> -<\/span> 1<\/span> ===<\/span> i<\/span> &&<\/span> <<\/span>button<\/span> onClick<\/span>=<\/span>{<\/span>handleAddClick<\/span>}<\/span>><\/span>Add<\/span><<\/span>\/button><\/span>}\r\n<\/span>            <<\/span>\/div<\/span>>\r\n<\/span>          <<\/span>\/div<\/span>>\r\n<\/span>        );<\/span>\r\n      })}<\/span>\r\n      <<\/span>div<\/span> style<\/span>=<\/span>{{<\/span> marginTop<\/span>:<\/span> 20<\/span> }}<\/span>><\/span>{<\/span>JSON<\/span>.<\/span>stringify<\/span>(<\/span>inputList<\/span>)}<\/span><<\/span>\/div<\/span>>\r\n<\/span>    <<\/span>\/div<\/span>>\r\n<\/span>  );<\/span>\r\n}<\/span>\r\nexport<\/span> default<\/span> App<\/span>;<\/span>\r\n<\/code><\/pre>\n
\u63d0\u53d6 JavaScript \u591a\u4e2a\u8868\u5355\u7684\u503c.<\/p>\n
  \/\/ \u958b\u59cb\u6642\u9593\u3068\u7d42\u4e86\u6642\u9593\u306e\u30da\u30a2\u3092\u53d6\u5f97<\/span>\r\n  function<\/span> inputTimeAtExtraction<\/span>(<\/span>timePairId<\/span>)<\/span> {<\/span>\r\n    const<\/span> inputTimePairAt<\/span> =<\/span> []<\/span>\r\n    \/\/ \u540c\u3058timePairId\u3092\u3082\u3064\u30d5\u30a9\u30fc\u30e0\u304b\u3089\u958b\u59cb\u6642\u9593\u3068\u7d42\u4e86\u6642\u9593\u306e\u5165\u529b\u5024\u3092\u53d6\u5f97<\/span>\r\n    const<\/span> timePairSelector<\/span> =<\/span> document<\/span>.<\/span>querySelectorAll<\/span>(<\/span>timePairId<\/span>)<\/span>\r\n    for<\/span> (<\/span>let<\/span> i<\/span> =<\/span> 0<\/span>;<\/span> i<\/span> <<\/span> timePairSelector<\/span>.<\/span>length<\/span>;<\/span> i<\/span>++<\/span>)<\/span> {<\/span>\r\n      const<\/span> timeAthtml<\/span> =<\/span> timePairSelector<\/span>[<\/span>i<\/span>].<\/span>innerHTML<\/span>\r\n      \/\/ \u6b63\u898f\u8868\u73fe\u3067innerHTML\u306e\u4e2d\u306e\u6642\u523b\u8868\u8a18\u3055\u308c\u305f\u7b87\u6240\u306e\u307f\u62bd\u51fa<\/span>\r\n      const<\/span> timeAtRegex<\/span> =<\/span> \/<\/span>([<\/span>01<\/span>]?[<\/span>0-9<\/span>]<\/span>|2<\/span>[<\/span>0-3<\/span>])<\/span>:<\/span>([<\/span>0-5<\/span>][<\/span>0-9<\/span>])<\/span>\/<\/span>\r\n      const<\/span> timeAtValue<\/span> =<\/span> timeAthtml<\/span>.<\/span>match<\/span>(<\/span>timeAtRegex<\/span>)<\/span>\r\n      if<\/span> (<\/span>timeAtValue<\/span>)<\/span> {<\/span>\r\n        inputTimePairAt<\/span>.<\/span>push<\/span>(<\/span>timeAtValue<\/span>[<\/span>0<\/span>])<\/span>\r\n      }<\/span>\r\n    }<\/span>\r\n    return<\/span> inputTimePairAt<\/span>\r\n  }<\/span>\r\n<\/code><\/pre>\n
\u91cd\u590d\u83b7\u53d6\u5bf9\u8c61<\/p>\n
let<\/span> objList<\/span> =<\/span> [{<\/span>\r\n  \"<\/span>id<\/span>\"<\/span> :<\/span> 5<\/span>,<\/span>\r\n  \"<\/span>name<\/span>\"<\/span> :<\/span> \"<\/span>June<\/span>\"<\/span>\r\n},{<\/span>\r\n  \"<\/span>id<\/span>\"<\/span> :<\/span> 4<\/span>,<\/span>\r\n  \"<\/span>name<\/span>\"<\/span> :<\/span> \"<\/span>Jane<\/span>\"<\/span>\r\n},{<\/span>\r\n  \"<\/span>id<\/span>\"<\/span> :<\/span> 3<\/span>,<\/span>\r\n  \"<\/span>name<\/span>\"<\/span> :<\/span> \"<\/span>Julia<\/span>\"<\/span>\r\n},{<\/span>\r\n  \"<\/span>id<\/span>\"<\/span> :<\/span> 2<\/span>,<\/span>\r\n  \"<\/span>name<\/span>\"<\/span> :<\/span> \"<\/span>Nancy<\/span>\"<\/span>\r\n},{<\/span>\r\n  \"<\/span>id<\/span>\"<\/span> :<\/span> 5<\/span>,<\/span>\r\n  \"<\/span>name<\/span>\"<\/span> :<\/span> \"<\/span>June<\/span>\"<\/span>\r\n},{<\/span>\r\n  \"<\/span>id<\/span>\"<\/span> :<\/span> 5<\/span>,<\/span>\r\n  \"<\/span>name<\/span>\"<\/span> :<\/span> \"<\/span>June<\/span>\"<\/span>\r\n}];<\/span>\r\nvar<\/span> uniqueUser<\/span> =<\/span> {};<\/span>\r\nobjList<\/span>.<\/span>forEach<\/span>(<\/span>function<\/span>(<\/span>user<\/span>)<\/span> {<\/span>\r\n  if<\/span> (<\/span>!<\/span>uniqueUser<\/span>[<\/span>user<\/span>.<\/span>id<\/span>])<\/span> {<\/span>\r\n    uniqueUser<\/span>[<\/span>user<\/span>.<\/span>id<\/span>]<\/span> =<\/span> user<\/span>;<\/span>\r\n  }<\/span>\r\n});<\/span>\r\nconsole<\/span>.<\/span>log<\/span>(<\/span>uniqueUser<\/span>)<\/span>\r\n<\/code><\/pre>\n
\u83b7\u53d6\u91cd\u590d\u503c\u7684JavaScript\u63d0\u53d6(JS)
\nhttps:\/\/www.w3resource.com\/javascript-exercises\/javascript-array-exercise-20.php<\/p>\n
function<\/span> find_duplicate_in_array<\/span>(<\/span>arra1<\/span>)<\/span> {<\/span>\r\n        var<\/span> object<\/span> =<\/span> {};<\/span>\r\n        var<\/span> result<\/span> =<\/span> [];<\/span>\r\n        arra1<\/span>.<\/span>forEach<\/span>(<\/span>function<\/span> (<\/span>item<\/span>)<\/span> {<\/span>\r\n          if<\/span>(<\/span>!<\/span>object<\/span>[<\/span>item<\/span>])<\/span>\r\n              object<\/span>[<\/span>item<\/span>]<\/span> =<\/span> 0<\/span>;<\/span>\r\n            object<\/span>[<\/span>item<\/span>]<\/span> +=<\/span> 1<\/span>;<\/span>\r\n        })<\/span>\r\n        for<\/span> (<\/span>var<\/span> prop<\/span> in<\/span> object<\/span>)<\/span> {<\/span>\r\n           if<\/span>(<\/span>object<\/span>[<\/span>prop<\/span>]<\/span> >=<\/span> 2<\/span>)<\/span> {<\/span>\r\n               result<\/span>.<\/span>push<\/span>(<\/span>prop<\/span>);<\/span>\r\n           }<\/span>\r\n        }<\/span>\r\n        return<\/span> result<\/span>;<\/span>\r\n    }<\/span>\r\n    console<\/span>.<\/span>log<\/span>(<\/span>find_duplicate_in_array<\/span>([<\/span>1<\/span>,<\/span> 2<\/span>,<\/span> -<\/span>2<\/span>,<\/span> 4<\/span>,<\/span> 5<\/span>,<\/span> 4<\/span>,<\/span> 7<\/span>,<\/span> 8<\/span>,<\/span> 7<\/span>,<\/span> 7<\/span>,<\/span> 71<\/span>,<\/span> 3<\/span>,<\/span> 6<\/span>]));<\/span>\r\n<\/code><\/pre>\n
Material UI \u63d0\u4f9b\u4e86\u8986\u76d6\u548c\u81ea\u5b9a\u4e49 CSS \u6837\u5f0f\u7684\u529f\u80fd\u3002<\/p>\n
https<\/span>:<\/span>\/\/material-ui.com\/customization\/globals\/#cs#seminer<\/span>\r\nimport<\/span> {<\/span> createMuiTheme<\/span>,<\/span> ThemeProvider<\/span> }<\/span> from<\/span> '<\/span>@material-ui\/core\/styles<\/span>'<\/span>;<\/span>\r\nconst<\/span> theme<\/span> =<\/span> createMuiTheme<\/span>({<\/span>\r\n  overrides<\/span>:<\/span> {<\/span>\r\n    \/\/ Style sheet name \u269b\ufe0f<\/span>\r\n    MuiButton<\/span>:<\/span> {<\/span>\r\n      \/\/ Name of the rule<\/span>\r\n      text<\/span>:<\/span> {<\/span>\r\n        \/\/ Some CSS<\/span>\r\n        color<\/span>:<\/span> '<\/span>white<\/span>'<\/span>,<\/span>\r\n      },<\/span>\r\n    },<\/span>\r\n  },<\/span>\r\n});<\/span>\r\nfunction<\/span> DefaultProps<\/span>()<\/span> {<\/span>\r\n  return<\/span> (<\/span>\r\n    <<\/span>ThemeProvider<\/span> theme<\/span>=<\/span>{<\/span>theme<\/span>}<\/span>><\/span>\r\n      <<\/span>Button<\/span>><\/span>Change<\/span> default<\/span> props<\/span><<\/span>\/Button<\/span>>\r\n<\/span>    <<\/span>\/ThemeProvider<\/span>>\r\n<\/span>  );<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u7528JSON\u683c\u5f0f\u663e\u793a\u6570\u7ec4\u7684\u72b6\u6001<\/p>\n
<<\/span>div<\/span> style<\/span>=<\/span>{{<\/span> marginTop<\/span>:<\/span> 20<\/span> }}<\/span>><\/span>{<\/span>JSON<\/span>.<\/span>stringify<\/span>(<\/span>\u914d\u5217\u306estate<\/span>)}<\/span><<\/span>\/div<\/span>>\r\n<\/span><\/code><\/pre>\n
\u4f7f\u7528React Hook Form<\/h2>\n
\u5982\u679c\u60f3\u8981\u6839\u636e\u591a\u4e2a\u63d0\u4ea4\u6216\u6309\u4e0b\u7684\u6309\u94ae\u6765\u66f4\u6539\u503c\uff0c\u53ef\u4ee5\u4f7f\u7528\u6309\u4e0b\u7684\u6309\u94ae\u6539\u53d8\u503c\u7684\u65b9\u5f0f\u3002<\/p>\n
import<\/span> *<\/span> as<\/span> React<\/span> from<\/span> \"<\/span>react<\/span>\"<\/span>;<\/span>\r\nimport<\/span> {<\/span> useForm<\/span> }<\/span> from<\/span> \"<\/span>react-hook-form<\/span>\"<\/span>;<\/span>\r\n\r\ntype<\/span> FormInputs<\/span> =<\/span> {<\/span>\r\n  firstName<\/span>:<\/span> string<\/span>\r\n  lastName<\/span>:<\/span> string<\/span>\r\n}<\/span>\r\n\r\nconst<\/span> App<\/span> =<\/span> ()<\/span> =><\/span> {<\/span>\r\n  const<\/span> {<\/span> register<\/span>,<\/span> handleSubmit<\/span>,<\/span> setValue<\/span> }<\/span> =<\/span> useForm<\/span><<\/span>FormInputs<\/span>><\/span>();<\/span>\r\n\r\n  const<\/span> onSubmit<\/span> =<\/span> (<\/span>data<\/span>:<\/span> FormInputs<\/span>)<\/span> =><\/span> console<\/span>.<\/span>log<\/span>(<\/span>data<\/span>);<\/span>\r\n\r\n  return<\/span> (<\/span>\r\n    <<\/span>form<\/span> onSubmit<\/span>=<\/span>{<\/span>handleSubmit<\/span>(<\/span>onSubmit<\/span>)}<\/span>><\/span>\r\n      <<\/span>input<\/span> {...<\/span>register<\/span>(<\/span>\"<\/span>firstName<\/span>\"<\/span>,<\/span> {<\/span> required<\/span>:<\/span> true<\/span> })}<\/span> \/<\/span>>\r\n<\/span>      <<\/span>input<\/span> {...<\/span>register<\/span>(<\/span>\"<\/span>lastName<\/span>\"<\/span>,<\/span> {<\/span> required<\/span>:<\/span> true<\/span> })}<\/span> \/<\/span>>\r\n<\/span>      <<\/span>button<\/span> onClick<\/span>=<\/span>{()<\/span> =><\/span> setValue<\/span>(<\/span>\"<\/span>firstName<\/span>\"<\/span>,<\/span> \"<\/span>Bill<\/span>\"<\/span>)}<\/span>><\/span>\r\n        Set<\/span> First<\/span> Name<\/span> Value<\/span>\r\n      <<\/span>\/button<\/span>>\r\n<\/span>      <<\/span>button<\/span>\r\n        onClick<\/span>=<\/span>{()<\/span> =><\/span>\r\n          setValue<\/span>(<\/span>\"<\/span>lastName<\/span>\"<\/span>,<\/span> \"<\/span>Luo<\/span>\"<\/span>,<\/span> {<\/span>\r\n            shouldValidate<\/span>:<\/span> true<\/span>,<\/span>\r\n            shouldDirty<\/span>:<\/span> true<\/span>\r\n          })<\/span>\r\n        }<\/span>\r\n      ><\/span>\r\n        Set<\/span> Last<\/span> Name<\/span>\r\n      <<\/span>\/button<\/span>>\r\n<\/span>      <<\/span>input<\/span> type<\/span>=<\/span>\"<\/span>submit<\/span>\"<\/span> \/><\/span>\r\n    <<\/span>\/form<\/span>>\r\n<\/span>  );<\/span>\r\n};<\/span>\r\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
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