{"id":192861,"date":"2020-11-15T13:54:25","date_gmt":"2020-11-15T05:54:25","guid":{"rendered":"http:\/\/4563.org\/?p=192861"},"modified":"2020-11-15T13:54:25","modified_gmt":"2020-11-15T05:54:25","slug":"%e8%ae%b0%e4%b8%80%e6%ac%a1-rxjs-%e4%b8%ad-subject-%e7%9a%84%e4%bd%bf%e7%94%a8%e7%bb%8f%e5%8e%86","status":"publish","type":"post","link":"http:\/\/4563.org\/?p=192861","title":{"rendered":"\u8bb0\u4e00\u6b21 RXjs \u4e2d Subject \u7684\u4f7f\u7528\u7ecf\u5386"},"content":{"rendered":"
\n
\n
\n

\u8bb0\u4e00\u6b21 RXjs \u4e2d Subject \u7684\u4f7f\u7528\u7ecf\u5386 <\/h1>\n

<\/p>\n

\n
\u8cc7\u6df1\u5927\u4f6c : shakukansp <\/span> <\/i> 8<\/span> <\/div>\n
<\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n
\u5199\u9879\u76ee\u7684\u65f6\u5019\u9047\u5230\u4e00\u4e2a\u573a\u666f
inputA blur \u7684\u65f6\u5019\u4f1a\u89e6\u53d1\u81ea\u5df1\u7684\u8868\u5355\u9a8c\u8bc1\u5e76\u53d1\u51fa\u4e00\u4e2a\u8bf7\u6c42\uff0c\u8bf7\u6c42\u6570\u636e\uff0c\u586b\u5165 input C
\u70b9\u51fb\u6309\u94ae B\uff0c\u4f1a\u89e6\u53d1 A \u3001C \u7684\u8868\u5355\u9a8c\u8bc1\uff0c\u5e76\u53d1\u9001 A \u3001C \u4e2d\u7684\u6570\u636e\u7ed9\u670d\u52a1\u7aef<\/p>\n

\u95ee\u9898\u6765\u4e86\uff0c\u9700\u8981\u4fdd\u8bc1 A \u7684\u5f02\u6b65\u5b8c\u6210\u4e4b\u540e\u518d\u8fdb\u884c B \u7684\u5f02\u6b65\u8bf7\u6c42\uff0c\u4e8e\u662f\u7b2c\u4e00\u65f6\u95f4\u60f3\u5230\u7528 rxjs \u7684 subject
\u601d\u8def\u662f\u8fd9\u6837\uff1a
\u521b\u5efa\u4e00\u4e2a subject D,
\u6309\u94ae B \u8ba2\u9605 D\uff0csubscribe \u7684 next \u5b9a\u4e49\u4e3a \u53d1\u9001 A \u3001C \u6570\u636e\u7ed9\u670d\u52a1\u7aef\u7684\u5f02\u6b65\u64cd\u4f5c
\u8fd9\u6837 Input A \u5728\u5f02\u6b65\u83b7\u53d6 C \u7684\u56de\u8c03\u4e2d \u89e6\u53d1 subject D \u7684 next \u65b9\u6cd5\uff0c\u628a\u8bf7\u6c42\u7ed3\u679c\u901a\u8fc7 subject \u5206\u53d1\u7ed9 B
B \u518d\u5728 subscribe \u4e2d\u63a5\u6536 D \u5206\u53d1\u6765\u7684\u503c\uff0c\u628a\u6570\u636e\u53d1\u9001\u7ed9\u670d\u52a1\u7aef
\u4f46\u662f\u5b9e\u64cd\u8fc7\u7a0b \u4e2d\u53d1\u73b0 B \u7684\u8868\u5355\u9a8c\u8bc1\u4f1a\u6162\u4e8e A \u7684 next\u2026\u2026 \u4e5f\u5c31\u662f A \u5df2\u7ecf\u8bf7\u6c42\u5b8c\u6570\u636e\u628a\u6570\u636e\u63a8\u9001\u7ed9 D \u4e86\uff0c\u4f46\u662f B \u8868\u5355\u9a8c\u8bc1\u8fd8\u6ca1\u5b8c\u2026\u2026 \u6240\u4ee5\u63a5\u6536\u4e0d\u5230 A \u4f20\u8fc7\u6765\u7684\u503c\uff0c\u65e0\u6cd5\u7ee7\u7eed\u53d1\u9001\u8bf7\u6c42<\/p>\n

\u65e0\u5948\u53ea\u597d\u53c8\u521b\u5efa\u4e86 subject E, \u5728 A \u7684\u8bf7\u6c42\u53d1\u51fa\u53bb\u4e4b\u524d \u8ba2\u9605 B \u7684\u8868\u5355\u9a8c\u8bc1\u7b49\u5f85\u5176\u5b8c\u6210\uff0csubscribe \u7684 next \u4e3a A \u8bf7\u6c42 C \u6570\u636e\u7684\u8fc7\u7a0b\u2026\u2026
\u8fd9\u6837\u4e00\u6765\uff0cB \u5c31\u9700\u8981\u5728\u9a8c\u8bc1\u5b8c\u6210\u4e4b\u540e \u89e6\u53d1 E \u7684 next, \u628a\u8868\u5355\u9a8c\u8bc1\u5b8c\u6210\u8fd9\u4e2a\u4e8b\u60c5\u544a\u8bc9 A \u2026\u2026 A \u63a5\u5230 B \u9a8c\u8bc1\u6210\u529f\u7684\u6d88\u606f\u4e4b\u540e\u518d\u901a\u8fc7 D \u628a \u8bf7\u6c42\u7ed3\u679c\u53d1\u7ed9 B\u2026\u2026<\/p>\n

\u597d\u4e86\uff0c\u5199\u5b8c\u4e4b\u540e\u6d4b\u8bd5\u4e86\u4e00\u4e0b\uff0c\u548c\u9884\u60f3\u4e2d\u7684\u7ed3\u679c\u4e00\u6837\uff0c\u5b8c\u7f8e\u2026\u2026
\uff1f\uff1f
\u90a3 A blur \u7684\u65f6\u5019\u5982\u679c\u4eba\u6ca1\u5728\u70b9\u51fb B\uff0c\u4e0d\u5c31\u6ca1\u6cd5\u901a\u77e5 A \u8868\u5355\u9a8c\u8bc1\u5b8c\u6210\u53ef\u4ee5\u7ee7\u7eed\u4e86\u5417\uff1f
\u6240\u4ee5\u9700\u8981\u52a0\u4e00\u4e2a\u5224\u65ad\u2026\u2026 \u5224\u65ad A \u7684 blur \u4e8b\u4ef6\u7684 relatedTarget \u5b58\u4e0d\u5b58\u5728\u4e14\u662f\u4e0d\u662f B\uff0c \u5982\u679c\u4e0d\u5b58\u5728\u6216\u8005\u4e0d\u662f B \u90a3\u4e48\u5c31\u7531 A \u81ea\u5df1\u901a\u77e5\u81ea\u5df1\u5b8c\u6210\u8bf7\u6c42 C \u7684\u503c\u7684\u8fc7\u7a0b\u3002<\/p>\n

\u8fd9\u4e0b\u7ec8\u4e8e\u600e\u4e48\u6d4b\u90fd\u6ca1\u95ee\u9898\u4e86\u3002<\/p>\n

\u7136\u540e\u6211\u53d1\u73b0\u76f4\u63a5 click \u6309\u94ae B \u7684\u65f6\u5019 \u4e5f\u53d1\u9001 A \u7684\u8bf7\u6c42\uff0c\u7136\u540e\u5728 A \u8bf7\u6c42\u7684\u56de\u8c03\u91cc\u9762\u8fdb\u884c B \u7684\u540e\u7eed\u8bf7\u6c42\u5373\u53ef
\u53ea\u8981\u5728 A blur \u7684\u65f6\u5019\u5224\u65ad\u4e00\u4e0b relatedTarget \u5b58\u4e0d\u5b58\u5728\u4e14\u662f\u4e0d\u662f B
\u5982\u679c\u4e0d\u5b58\u5728\u6216\u8005\u4e0d\u662f B \u90a3\u4e48 A \u5c31\u4e0d\u53d1\u8bf7\u6c42
\u5b8c\u4e8b<\/p>\n

\u86cb\u75bc\u3002 <\/p><\/div>\n

\u5927\u4f6c\u6709\u8a71\u8aaa<\/b> (6<\/span>) <\/div>\n
<\/div>\n<\/p><\/div>\n<\/p><\/div>\n
    \n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : chnwillliu <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u611f\u89c9\u4e0d\u9700\u8981 Subject \u5427\u3002<\/p>\n

    A blur \u4f1a\u89e6\u53d1\u9a8c\u8bc1\u5e76\u53d1\u8bf7\u6c42\uff0c\u8fd9\u4e2a\u5c31\u5b83\u81ea\u5df1\u7ba1\u597d\u81ea\u5df1\u5c31 OK \u3002B click \u9700\u8981\u68c0\u6d4b\u5f53\u524d\u6709\u65e0\u6b63\u5728 pending \u7684 A blur \u5f15\u8d77\u7684\u8bf7\u6c42\uff0c\u6709\u5219\u7b49\u5f85\uff0c\u65e0\u5219\u76f4\u63a5\u505a\u81ea\u5df1\u8be5\u505a\u7684\u4e8b\u3002<\/p>\n

    \u4e0d\u8ffd\u6c42\u5b8c\u5168\u51fd\u6570\u7f16\u7a0b\uff0c\u5c31\u53ef\u4ee5\u628a A blur \u53d1\u8bf7\u6c42\u7684 observable \u7528\u53d8\u91cf\u4fdd\u5b58\u8d77\u6765\u3002<\/p>\n

    \u5927\u6982\u8fd9\u4e2a\u610f\u601d\uff1a<\/p>\n

    “`
    let pendingRequest = null;<\/p>\n

    inputABlur$
    .pipe(
    switchMap(() => {
    pendingRequest = httpClient.get(‘\/url’, data).pipe(share());
    return pendingRequest;
    }),
    finallize(() => {
    pendingRequest = null;
    })
    )
    .subscribe();<\/p>\n

    buttonBClick$
    .pipe(
    switchMap(value => {
    if (pendingRequest) {
    return pendingRequest.pipe(mapTo(value));
    }
    return of(value);
    }),
    switchMap(() => httpClient.get(‘\/url-a-c’, dataAC))
    )
    .subscribe();<\/p>\n

    “` <\/div>\n<\/p><\/div>\n<\/li>\n

  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : chnwillliu <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u4f60\u8fd9\u91cc\u7684\u8868\u5355\u9a8c\u8bc1\u5177\u4f53\u662f\u4ec0\u4e48\u64cd\u4f5c\uff1f\u4e0d\u5e94\u8be5\u662f\u540c\u6b65\u7684\u64cd\u4f5c\u4e48\uff1f <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : xuanbg <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u5728 A \u7684\u56de\u8c03\u91cc\u9762\u663e\u793a B \u6309\u94ae\uff0c\u8fd9\u6837\u5c31\u80fd\u4fdd\u8bc1 A \u8fd4\u56de\u6b63\u786e\u7ed3\u679c\u540e B \u624d\u53d8\u5f97\u53ef\u70b9\u51fb\u3002\u51e1\u662f\u9700\u8981\u5957\u5a03\u7684\u90fd\u53ef\u4ee5\u5957\u7528\u8fd9\u4e2a\u65b9\u6cd5\u3002 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u4e3b<\/span> \u8cc7\u6df1\u5927\u4f6c : shakukansp <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    @chnwillliu \u4e00\u822c\u662f\u7528\u6237\u586b\u5b8c\u4e86 a \u4ee5\u540e blur,\u770b\u5230 c \u6846\u5185\u7684\u6570\u636e\u6539\u53d8\u4e86\uff0c\u7136\u540e\u518d\u53bb\u70b9 B<\/p>\n

    \u4f46\u662f\u73b0\u5728\u6d4b\u8bd5\u7684\u65f6\u5019\u6709\u7c98\u8d34\u5230 a \u4ee5\u540e\u76f4\u63a5\u70b9 B \u7684\u60c5\u51b5\uff0c\u8fd9\u91cc\u9700\u8981\u5904\u7406 blur -> click \u6781\u77ed\u65f6\u95f4\u5185\u7684\u5f02\u6b65\u6d41\u7a0b<\/p>\n

    @xuanbg \u786e\u5b9e\uff0c\u4f46\u662f\u8fd9\u4e2a\u95ee\u9898\u7684\u573a\u666f\u5c31\u50cf\u4e0a\u9762\u8bf4\u7684\uff0c\u7528\u6237\u7c98\u8d34\u5230 a \u4ee5\u540e\u76f4\u63a5\u53bb\u70b9\u4e86 b\uff0c\u73b0\u5728\u60f3\u60f3\u83b7\u53d6\u4e00\u5f00\u59cb\u8bbe\u7f6e b \u4e0d\u53ef\u70b9\u51fb\uff0cC \u6709\u503c\u7684\u65f6\u5019\u518d\u5141\u8bb8\u70b9\u51fb\u6bd4\u8f83\u597d <\/div>\n<\/p><\/div>\n<\/li>\n

  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : chnwillliu <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    @shakukansp blur \u603b\u662f\u4f1a\u4f18\u5148\u4e8e click \u89e6\u53d1\u7684\uff0c\u6240\u4ee5 click \u5185\u90e8\u5224\u65ad\u6709\u65e0 blur \u5f15\u8d77\u7684 request \u5728 pending \u5c31\u53ef\u4ee5\u3002<\/p>\n

    \u4e0d\u77e5\u9053\u4f60\u7684 A \u6846\u4e2d\u7684\u503c\u4e0d\u540c\u4f1a\u4e0d\u4f1a\u5f71\u54cd C \u6846\u5f97\u5230\u4e0d\u4e00\u6837\u7684\u7ed3\u679c\uff0c\u5982\u679c\u4f1a\u7684\u8bdd\uff0cC \u6709\u503c\u518d enable B \u6309\u94ae\u8fd9\u79cd\u65b9\u6848\u8fd8\u662f\u6709\u95ee\u9898\u3002 <\/p><\/div>\n<\/p><\/div>\n<\/li>\n

  • \n
    \n
    \n
    \u4e3b<\/span> \u8cc7\u6df1\u5927\u4f6c : shakukansp <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    @chnwillliu \u786e\u5b9e\u4e0d\u59a5\uff0c\u6211\u5c1d\u8bd5\u4e00\u4e0b\u4f60\u7684\u65b9\u6cd5 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n","protected":false},"excerpt":{"rendered":"

    \u8bb0\u4e00\u6b21 RXjs \u4e2d Subjec…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[],"tags":[],"_links":{"self":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts\/192861"}],"collection":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=192861"}],"version-history":[{"count":0,"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts\/192861\/revisions"}],"wp:attachment":[{"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=192861"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=192861"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=192861"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}