{"id":38722,"date":"2023-12-17T19:46:48","date_gmt":"2022-12-12T05:40:34","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e3%80%90angular%e3%80%91angular%e7%9a%84%e6%93%8d%e4%bd%9c%e7%ac%a6%e6%80%bb%e7%bb%93\/"},"modified":"2024-05-04T14:04:37","modified_gmt":"2024-05-04T06:04:37","slug":"%e3%80%90angular%e3%80%91angular%e7%9a%84%e6%93%8d%e4%bd%9c%e7%ac%a6%e6%80%bb%e7%bb%93","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e3%80%90angular%e3%80%91angular%e7%9a%84%e6%93%8d%e4%bd%9c%e7%ac%a6%e6%80%bb%e7%bb%93\/","title":{"rendered":"\u3010Angular\u3011Angular\u7684\u64cd\u4f5c\u7b26\u603b\u7ed3"},"content":{"rendered":"<h1>\u8fd0\u8425\u5546\u662f\u6307<\/h1>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u30aa\u30da\u30ec\u30fc\u30bf\u30fc\u306f\u3001 \u30ea\u30a2\u30af\u30c6\u30a3\u30d6\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0 \u3067\u3001Observable\u30af\u30e9\u30b9\u3067\u6271\u3046 \u30b9\u30c8\u30ea\u30fc\u30e0\u306e\u9ad8\u5ea6\u306a\u64cd\u4f5c \u3092\u53ef\u80fd\u306b\u3059\u308b\u305f\u3081\u306e\u95a2\u6570\u3067\u3059\u3002<\/ul>\n<\/li>\n<\/ul>\n<p>\u30ea\u30a2\u30af\u30c6\u30a3\u30d6\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\uff1a\u6d41\u308c\u3066\u304f\u308b\u30c7\u30fc\u30bf\uff08\u30b9\u30c8\u30ea\u30fc\u30e0\uff09\u306b\u95a2\u9023\u6027\u3068\u64cd\u4f5c\u3092\u5ba3\u8a00\u7684\u306b\u8a18\u8ff0\u3059\u308b\u624b\u6cd5\u306e\u3053\u3068\u3067\u3059<br \/>\nObservable\uff1a\u30b9\u30c8\u30ea\u30fc\u30e0\u3092\u6271\u3046\u30af\u30e9\u30b9\u3067\u3059<\/p>\n<p>\u4f8b\uff1a\u30de\u30a6\u30b9\u64cd\u4f5c\u3084HTTP\u30ea\u30af\u30a8\u30b9\u30c8\u3067\u30c7\u30fc\u30bf\u53d6\u5f97\u3059\u308b\u306a\u3069<\/p>\n<p>\u30b9\u30c8\u30ea\u30fc\u30e0\u306f\u5ddd\u306e\u69d8\u306a\u30a4\u30e1\u30fc\u30b8\u3067\u3059<br \/>\n\u3064\u307e\u308a\u30aa\u30da\u30ec\u30fc\u30bf\u306f\u3001\u5ddd\uff08\u30b9\u30c8\u30ea\u30fc\u30e0\uff09\u306e \u4e2d\u9593\u3067\u51e6\u7406\u3059\u308b\u4ed5\u7d44\u307f \u3067\u3042\u308a\u3001\u6d41\u308c\u3066\u304d\u305f\u30c7\u30fc\u30bf\u3092\u4e0b\u6d41\u3067\u30ad\u30e3\u30c3\u30c1\u3057\u3066\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u9593\u306e\u30c7\u30fc\u30bf\u306e\u3084\u308a\u53d6\u308a\u3092\u3057\u307e\u3059<\/p>\n<h1>\u4e3b\u8981\u8fd0\u8425\u5546\u7684\u4f7f\u7528\u65b9\u6cd5<\/h1>\n<h2>OF\u64cd\u4f5c<\/h2>\n<ul class=\"post-ul\">\u6e21\u3063\u3066\u304d\u305f\u30c7\u30fc\u30bf\u306b\u4f55\u3082\u305b\u305a\u305d\u306e\u307e\u307e\u6d41\u3057\u307e\u3059<\/ul>\n<pre class=\"post-pre\"><code><span class=\"k\">import<\/span> <span class=\"p\">{<\/span> <span class=\"k\">of<\/span> <span class=\"p\">}<\/span> <span class=\"k\">from<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">rxjs<\/span><span class=\"dl\">'<\/span><span class=\"p\">;<\/span>\r\n<span class=\"kd\">const<\/span> <span class=\"nx\">cats<\/span> <span class=\"o\">=<\/span> <span class=\"k\">of<\/span><span class=\"p\">(<\/span><span class=\"dl\">'<\/span><span class=\"s1\">cat1<\/span><span class=\"dl\">'<\/span><span class=\"p\">,<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">cat2<\/span><span class=\"dl\">'<\/span><span class=\"p\">,<\/span><span class=\"dl\">'<\/span><span class=\"s1\">cat3<\/span><span class=\"dl\">'<\/span><span class=\"p\">);<\/span>\r\n<span class=\"nx\">cats<\/span><span class=\"p\">.<\/span><span class=\"nx\">subscribe<\/span><span class=\"p\">(<\/span><span class=\"nx\">cat<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"nx\">console<\/span><span class=\"p\">.<\/span><span class=\"nx\">log<\/span><span class=\"p\">(<\/span><span class=\"nx\">cat<\/span><span class=\"p\">));<\/span> <span class=\"c1\">\/\/ cat1, cat2, cat3<\/span>\r\n<\/code><\/pre>\n<h2>\u5730\u56fe\u64cd\u4f5c\u5458<\/h2>\n<ul class=\"post-ul\">\u6e21\u3063\u3066\u304d\u305f\u30c7\u30fc\u30bf\u3092\u53d7\u3051\u53d6\u3063\u3066\u9055\u3046\u30c7\u30fc\u30bf\u3092\u8fd4\u3057\u307e\u3059<\/ul>\n<pre class=\"post-pre\"><code><span class=\"k\">import<\/span> <span class=\"p\">{<\/span> <span class=\"k\">of<\/span> <span class=\"p\">}<\/span> <span class=\"k\">from<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">rxjs<\/span><span class=\"dl\">'<\/span><span class=\"p\">;<\/span>\r\n<span class=\"k\">import<\/span> <span class=\"p\">{<\/span> <span class=\"nx\">map<\/span> <span class=\"p\">}<\/span> <span class=\"k\">from<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">rxjs\/operators<\/span><span class=\"dl\">'<\/span><span class=\"p\">;<\/span>\r\n\r\n<span class=\"kd\">const<\/span> <span class=\"nx\">nums<\/span> <span class=\"o\">=<\/span> <span class=\"k\">of<\/span><span class=\"p\">(<\/span><span class=\"mi\">1<\/span><span class=\"p\">,<\/span> <span class=\"mi\">2<\/span><span class=\"p\">,<\/span> <span class=\"mi\">3<\/span><span class=\"p\">)<\/span>\r\n<span class=\"p\">.<\/span><span class=\"nx\">pipe<\/span><span class=\"p\">(<\/span>\r\n  <span class=\"nx\">map<\/span><span class=\"p\">(<\/span><span class=\"nx\">num<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"nx\">num<\/span> <span class=\"o\">*<\/span> <span class=\"nx\">num<\/span><span class=\"p\">)<\/span>\r\n<span class=\"p\">).<\/span><span class=\"nx\">subscribe<\/span><span class=\"p\">(<\/span>\r\n  <span class=\"nx\">num<\/span>  <span class=\"o\">=&gt;<\/span> <span class=\"nx\">console<\/span><span class=\"p\">.<\/span><span class=\"nx\">log<\/span><span class=\"p\">(<\/span><span class=\"nx\">num<\/span><span class=\"p\">)<\/span> <span class=\"c1\">\/\/ 1, 4, 9<\/span>\r\n<span class=\"p\">);<\/span>\r\n<\/code><\/pre>\n<h2>\u7b5b\u9009\u8fd0\u7b97\u7b26<\/h2>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u6d41\u308c\u3066\u304d\u305f\u30c7\u30fc\u30bf\u30c1\u30a7\u30c3\u30af\u3092\u884c\u3044\u3001\u6761\u4ef6\u306b\u3042\u3063\u305f\u5834\u5408\u306e\u307f\u3001\u30b9\u30c8\u30ea\u30fc\u30e0\u304c\u6d41\u308c\u307e\u3059<\/ul>\n<\/li>\n<\/ul>\n<p>\u6587\u5b57\u5217\u4e00\u81f4\u5224\u5b9a\u3001typeOf\u6f14\u7b97\u5b50\u3067\u3001\u3069\u306e\u7a2e\u985e\u306e\u6f14\u7b97\u5b50\u304b\u5224\u5b9a\u3059\u308b\u306a\u3069\u306b\u4f7f\u3048\u307e\u3059<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">import<\/span> <span class=\"p\">{<\/span> <span class=\"k\">of<\/span> <span class=\"p\">}<\/span> <span class=\"k\">from<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">rxjs<\/span><span class=\"dl\">'<\/span><span class=\"p\">;<\/span>\r\n<span class=\"k\">import<\/span> <span class=\"p\">{<\/span> <span class=\"nx\">filter<\/span> <span class=\"p\">}<\/span> <span class=\"k\">from<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">rxjs\/operators<\/span><span class=\"dl\">'<\/span><span class=\"p\">;<\/span>\r\n\r\n<span class=\"kd\">const<\/span> <span class=\"nx\">cats<\/span> <span class=\"o\">=<\/span> <span class=\"k\">of<\/span><span class=\"p\">(<\/span><span class=\"dl\">'<\/span><span class=\"s1\">mike<\/span><span class=\"dl\">'<\/span><span class=\"p\">,<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">tama<\/span><span class=\"dl\">'<\/span><span class=\"p\">,<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">mikeneko<\/span><span class=\"dl\">'<\/span><span class=\"p\">)<\/span>\r\n<span class=\"p\">.<\/span><span class=\"nx\">pipe<\/span><span class=\"p\">(<\/span>\r\n  <span class=\"nx\">filter<\/span><span class=\"p\">(<\/span><span class=\"nx\">cat<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"nx\">cat<\/span> <span class=\"o\">===<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">mike<\/span><span class=\"dl\">'<\/span><span class=\"p\">)<\/span>\r\n<span class=\"p\">).<\/span><span class=\"nx\">subscribe<\/span><span class=\"p\">(<\/span>\r\n  <span class=\"nx\">cat<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"nx\">console<\/span><span class=\"p\">.<\/span><span class=\"nx\">log<\/span><span class=\"p\">(<\/span> <span class=\"s2\">`matched: <\/span><span class=\"p\">${<\/span><span class=\"nx\">cat<\/span><span class=\"p\">}<\/span><span class=\"s2\">`<\/span><span class=\"p\">)<\/span> <span class=\"c1\">\/\/matched: mike<\/span>\r\n<span class=\"p\">);<\/span>\r\n<\/code><\/pre>\n<h2>\u9632\u6296\u65f6\u95f4\u64cd\u4f5c\u7b26<\/h2>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u9023\u7d9a\u3057\u3066\u30c7\u30fc\u30bf\u3092\u6d41\u3059\u3068\u304d\u306b\u3001\u6307\u5b9a\u6642\u9593\u9045\u5ef6\u5f8c\u3001\u6700\u5f8c\u306e\u30c7\u30fc\u30bf\u3092\u4e00\u5ea6\u306e\u307f\u30b9\u30c8\u30ea\u30fc\u30e0\u3092\u6d41\u3057\u307e\u3059<\/ul>\n<\/li>\n<\/ul>\n<p>debounceTime(250)\u3067\u306f\u3001250msec\u4ee5\u4e0b\u306e\u30b9\u30c8\u30ea\u30fc\u30e0\u306f\u6d41\u308c\u306a\u3044<\/p>\n<p>\u4f55\u56de\u3082\u6d41\u308c\u306a\u3044\u3088\u3046\u306b\u5236\u5fa1\u3067\u304d\u307e\u3059<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">import<\/span> <span class=\"p\">{<\/span> <span class=\"k\">of<\/span> <span class=\"p\">}<\/span> <span class=\"k\">from<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">rxjs<\/span><span class=\"dl\">'<\/span><span class=\"p\">;<\/span>\r\n<span class=\"k\">import<\/span> <span class=\"p\">{<\/span> <span class=\"nx\">map<\/span><span class=\"p\">,<\/span> <span class=\"nx\">debounceTime<\/span> <span class=\"p\">}<\/span> <span class=\"k\">from<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">rxjs\/operators<\/span><span class=\"dl\">'<\/span><span class=\"p\">;<\/span>\r\n\r\n<span class=\"c1\">\/\/ \u9023\u7d9a\u3059\u308b\u6700\u5f8c\u306e\u51e6\u7406\u304b\u3089250\u30df\u30ea\u79d2\u9045\u5ef6\u5f8c\u3001\u6700\u5f8c\u306e\u30c7\u30fc\u30bf\u30921\u5ea6\u3060\u3051\u30b9\u30c8\u30ea\u30fc\u30e0\u306b\u6d41\u3059<\/span>\r\n<span class=\"kd\">const<\/span> <span class=\"nx\">nums<\/span> <span class=\"o\">=<\/span> <span class=\"k\">of<\/span><span class=\"p\">(<\/span><span class=\"mi\">1<\/span><span class=\"p\">,<\/span> <span class=\"mi\">2<\/span><span class=\"p\">,<\/span> <span class=\"mi\">3<\/span><span class=\"p\">,<\/span> <span class=\"mi\">4<\/span><span class=\"p\">,<\/span> <span class=\"mi\">5<\/span><span class=\"p\">,<\/span> <span class=\"mi\">6<\/span><span class=\"p\">,<\/span> <span class=\"mi\">7<\/span><span class=\"p\">,<\/span> <span class=\"mi\">8<\/span><span class=\"p\">,<\/span> <span class=\"mi\">9<\/span><span class=\"p\">,<\/span> <span class=\"mi\">10<\/span><span class=\"p\">)<\/span>\r\n<span class=\"p\">.<\/span><span class=\"nx\">pipe<\/span><span class=\"p\">(<\/span>\r\n    <span class=\"nx\">debounceTime<\/span><span class=\"p\">(<\/span><span class=\"mi\">250<\/span><span class=\"p\">),<\/span>\r\n    <span class=\"nx\">map<\/span><span class=\"p\">(<\/span><span class=\"nx\">value<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"s2\">`debounceTime(250): <\/span><span class=\"p\">${<\/span><span class=\"nx\">value<\/span><span class=\"p\">}<\/span><span class=\"s2\">`<\/span><span class=\"p\">)<\/span>\r\n<span class=\"p\">)<\/span>\r\n<span class=\"p\">.<\/span><span class=\"nx\">subscribe<\/span><span class=\"p\">(<\/span>\r\n  <span class=\"nx\">value<\/span>  <span class=\"o\">=&gt;<\/span> <span class=\"nx\">console<\/span><span class=\"p\">.<\/span><span class=\"nx\">log<\/span><span class=\"p\">(<\/span><span class=\"nx\">value<\/span><span class=\"p\">)<\/span> <span class=\"c1\">\/\/ debounceTime(250): 10<\/span>\r\n<span class=\"p\">);<\/span>\r\n<\/code><\/pre>\n<h2>\u8282\u6d41\u65f6\u95f4\u64cd\u4f5c\u7b26<\/h2>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u9023\u7d9a\u3057\u3066\u30c7\u30fc\u30bf\u3092\u6d41\u3059\u3068\u304d\u306b\u3001\u4e2d\u9593\u51e6\u7406\u3092250\u30df\u30ea\u79d2\u9593\u9694\u3067\u9593\u5f15\u304f\u3053\u3068\u304c\u3067\u304d\u307e\u3059<\/ul>\n<\/li>\n<\/ul>\n<p>window\u306e\u30b9\u30af\u30ed\u30fc\u30eb\u3092\u9593\u5f15\u304d\u305f\u3044\u3068\u304d\u306a\u3069\u306b\u4f7f\u3044\u307e\u3059<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">import<\/span> <span class=\"p\">{<\/span> <span class=\"k\">of<\/span> <span class=\"p\">}<\/span> <span class=\"k\">from<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">rxjs<\/span><span class=\"dl\">'<\/span><span class=\"p\">;<\/span>\r\n<span class=\"k\">import<\/span> <span class=\"p\">{<\/span> <span class=\"nx\">map<\/span><span class=\"p\">,<\/span> <span class=\"nx\">throttleTime<\/span> <span class=\"p\">}<\/span> <span class=\"k\">from<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">rxjs\/operators<\/span><span class=\"dl\">'<\/span><span class=\"p\">;<\/span>\r\n\r\n<span class=\"c1\">\/\/ \u9023\u7d9a\u3059\u308b\u51e6\u7406\u3092250\u30df\u30ea\u79d2\u9593\u9694\u3067\u9593\u5f15\u304f<\/span>\r\n<span class=\"kd\">const<\/span> <span class=\"nx\">nums<\/span> <span class=\"o\">=<\/span> <span class=\"k\">of<\/span><span class=\"p\">(<\/span><span class=\"mi\">1<\/span><span class=\"p\">,<\/span> <span class=\"mi\">2<\/span><span class=\"p\">,<\/span> <span class=\"mi\">3<\/span><span class=\"p\">,<\/span> <span class=\"mi\">4<\/span><span class=\"p\">,<\/span> <span class=\"mi\">5<\/span><span class=\"p\">,<\/span> <span class=\"mi\">6<\/span><span class=\"p\">,<\/span> <span class=\"mi\">7<\/span><span class=\"p\">,<\/span> <span class=\"mi\">8<\/span><span class=\"p\">,<\/span> <span class=\"mi\">9<\/span><span class=\"p\">,<\/span> <span class=\"mi\">10<\/span><span class=\"p\">)<\/span>\r\n<span class=\"p\">.<\/span><span class=\"nx\">pipe<\/span><span class=\"p\">(<\/span>\r\n    <span class=\"nx\">throttleTime<\/span><span class=\"p\">(<\/span><span class=\"mi\">250<\/span><span class=\"p\">),<\/span>\r\n    <span class=\"nx\">map<\/span><span class=\"p\">(<\/span><span class=\"nx\">value<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"s2\">`throttleTime(250): <\/span><span class=\"p\">${<\/span><span class=\"nx\">value<\/span><span class=\"p\">}<\/span><span class=\"s2\">`<\/span><span class=\"p\">)<\/span>\r\n<span class=\"p\">)<\/span>\r\n<span class=\"p\">.<\/span><span class=\"nx\">subscribe<\/span><span class=\"p\">(<\/span>\r\n  <span class=\"nx\">value<\/span>  <span class=\"o\">=&gt;<\/span> <span class=\"nx\">console<\/span><span class=\"p\">.<\/span><span class=\"nx\">log<\/span><span class=\"p\">(<\/span><span class=\"nx\">value<\/span><span class=\"p\">)<\/span> <span class=\"c1\">\/\/ debounceTime(250): 1<\/span>\r\n<span class=\"p\">);<\/span>\r\n<\/code><\/pre>\n<h2>distinctUntilChanged \u8fd0\u7b97\u7b26<\/h2>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u524d\u56de\u3068\u30c7\u30fc\u30bf\u304c\u9055\u3046\u6642\u306e\u307f\u30c7\u30fc\u30bf\u3092\u6d41\u3057\u307e\u3059<\/ul>\n<\/li>\n<\/ul>\n<p>\u540c\u3058\u30c7\u30fc\u30bf\u3092\u9023\u7d9a\u3067\u6d41\u3057\u305f\u304f\u306a\u3044\u6642\u306b\u4f7f\u3044\u307e\u3059<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">import<\/span> <span class=\"p\">{<\/span> <span class=\"k\">of<\/span> <span class=\"p\">}<\/span> <span class=\"k\">from<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">rxjs<\/span><span class=\"dl\">'<\/span><span class=\"p\">;<\/span>\r\n<span class=\"k\">import<\/span> <span class=\"p\">{<\/span> <span class=\"nx\">distinctUntilChanged<\/span><span class=\"p\">,<\/span> <span class=\"nx\">map<\/span> <span class=\"p\">}<\/span> <span class=\"k\">from<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">rxjs\/operators<\/span><span class=\"dl\">'<\/span><span class=\"p\">;<\/span>\r\n\r\n<span class=\"c1\">\/\/ \u524d\u56de\u3068\u5024\u304c\u9055\u3046\u5834\u5408\u306e\u307f\u3001\u30b9\u30c8\u30ea\u30fc\u30e0\u3092\u6d41\u3059<\/span>\r\n<span class=\"kd\">const<\/span> <span class=\"nx\">cats<\/span> <span class=\"o\">=<\/span> <span class=\"k\">of<\/span><span class=\"p\">(<\/span><span class=\"dl\">'<\/span><span class=\"s1\">mike<\/span><span class=\"dl\">'<\/span><span class=\"p\">,<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">mike<\/span><span class=\"dl\">'<\/span><span class=\"p\">,<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">mike<\/span><span class=\"dl\">'<\/span> <span class=\"p\">,<\/span><span class=\"dl\">'<\/span><span class=\"s1\">mikeneko<\/span><span class=\"dl\">'<\/span><span class=\"p\">)<\/span>\r\n<span class=\"p\">.<\/span><span class=\"nx\">pipe<\/span><span class=\"p\">(<\/span>\r\n    <span class=\"nx\">distinctUntilChanged<\/span><span class=\"p\">(),<\/span>\r\n<span class=\"p\">).<\/span><span class=\"nx\">subscribe<\/span><span class=\"p\">(<\/span>\r\n    <span class=\"nx\">cat<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"nx\">console<\/span><span class=\"p\">.<\/span><span class=\"nx\">log<\/span><span class=\"p\">(<\/span> <span class=\"s2\">`distinctUntilChanged: <\/span><span class=\"p\">${<\/span><span class=\"nx\">cat<\/span><span class=\"p\">}<\/span><span class=\"s2\">`<\/span> <span class=\"p\">)<\/span> \r\n<span class=\"p\">);<\/span>\r\n\r\n<span class=\"c1\">\/\/ distinctUntilChanged: mike<\/span>\r\n<span class=\"c1\">\/\/ distinctUntilChanged: mikeneko<\/span>\r\n<\/code><\/pre>\n<h2>switchMap\u64cd\u4f5c\u7b26<\/h2>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">Stream A\u306b\u6d41\u308c\u3066\u304f\u308b\u30c7\u30fc\u30bf\u3092\u5143\u306b\u3001\u5225\u306eStream B\u3092\u6d41\u3057\u307e\u3059<\/ul>\n<\/li>\n<\/ul>\n<p>Observable \u3092\u5207\u308a\u66ff\u3048\u3066\u3001\u5225\u306eObservable \u3092\u8fd4\u3059\u3053\u3068\u304c\u3067\u304d\u307e\u3059<br \/>\n\u5225\u306eStream B\u304c\u7d42\u308f\u308b\u524d\u306b\u3001\u5143\u306eStream A \u304c\u6d41\u308c\u305f\u5834\u5408\u3001\u9014\u4e2d\u307e\u3067\u306eStream B\u306f\u30ad\u30e3\u30f3\u30bb\u30eb\u3055\u308c\u3066\u3001\u59cb\u3081\u304b\u3089\u518d\u3073\u5b9f\u884c\u3055\u308c\u307e\u3059<\/p>\n<p>HTTP\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u3067\u30ea\u30af\u30a8\u30b9\u30c8\u3092\u6295\u3052\u305f\u5f8c\u3001\u51e6\u7406\u3092\u9014\u4e2d\u3067\u6b62\u3081\u308b\u6642\u306b\u4f7f\u3044\u307e\u3059<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">import<\/span> <span class=\"p\">{<\/span> <span class=\"nx\">interval<\/span><span class=\"p\">,<\/span> <span class=\"k\">of<\/span> <span class=\"p\">}<\/span> <span class=\"k\">from<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">rxjs<\/span><span class=\"dl\">'<\/span><span class=\"p\">;<\/span>\r\n<span class=\"k\">import<\/span> <span class=\"p\">{<\/span> <span class=\"nx\">map<\/span><span class=\"p\">,<\/span> <span class=\"nx\">switchMap<\/span><span class=\"p\">,<\/span> <span class=\"nx\">take<\/span><span class=\"p\">}<\/span> <span class=\"k\">from<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">rxjs\/operators<\/span><span class=\"dl\">'<\/span><span class=\"p\">;<\/span>\r\n\r\n<span class=\"kd\">const<\/span> <span class=\"nx\">cats<\/span> <span class=\"o\">=<\/span> <span class=\"k\">of<\/span><span class=\"p\">(<\/span><span class=\"dl\">'<\/span><span class=\"s1\">mike<\/span><span class=\"dl\">'<\/span><span class=\"p\">,<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">mike<\/span><span class=\"dl\">'<\/span><span class=\"p\">,<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">mike<\/span><span class=\"dl\">'<\/span> <span class=\"p\">,<\/span><span class=\"dl\">'<\/span><span class=\"s1\">mikeneko<\/span><span class=\"dl\">'<\/span><span class=\"p\">)<\/span> <span class=\"c1\">\/\/ StreamA<\/span>\r\n<span class=\"p\">.<\/span><span class=\"nx\">pipe<\/span><span class=\"p\">(<\/span>\r\n    <span class=\"nx\">switchMap<\/span><span class=\"p\">(<\/span><span class=\"nx\">cat<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\r\n          <span class=\"k\">return<\/span> <span class=\"nx\">interval<\/span><span class=\"p\">(<\/span><span class=\"mi\">1000<\/span><span class=\"p\">).<\/span><span class=\"nx\">pipe<\/span><span class=\"p\">(<\/span> <span class=\"c1\">\/\/ StreamB<\/span>\r\n            <span class=\"nx\">take<\/span><span class=\"p\">(<\/span><span class=\"mi\">3<\/span><span class=\"p\">),<\/span>\r\n            <span class=\"nx\">map<\/span><span class=\"p\">((<\/span><span class=\"nx\">index<\/span><span class=\"p\">)<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"s2\">`switchMap: <\/span><span class=\"p\">${<\/span><span class=\"nx\">index<\/span><span class=\"p\">}<\/span><span class=\"s2\"> =&gt; <\/span><span class=\"p\">${<\/span><span class=\"nx\">cat<\/span><span class=\"p\">}<\/span><span class=\"s2\">`<\/span><span class=\"p\">)<\/span>\r\n          <span class=\"p\">);<\/span>\r\n      <span class=\"p\">})<\/span>\r\n  <span class=\"p\">)<\/span>       \r\n<span class=\"p\">.<\/span><span class=\"nx\">subscribe<\/span><span class=\"p\">(<\/span>\r\n    <span class=\"nx\">cat<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"nx\">console<\/span><span class=\"p\">.<\/span><span class=\"nx\">log<\/span><span class=\"p\">(<\/span> <span class=\"s2\">`<\/span><span class=\"p\">${<\/span><span class=\"nx\">cat<\/span><span class=\"p\">}<\/span><span class=\"s2\">`<\/span> <span class=\"p\">)<\/span> \r\n<span class=\"p\">);<\/span>\r\n<\/code><\/pre>\n<h2>\u8df3\u8fc7\u64cd\u4f5c\u7b26 gu\u00f2 zu\u00f2 f\u00fa)<\/h2>\n<ul class=\"post-ul\">\u6307\u5b9a\u3057\u305f\u56de\u6570\u5206\u3001\u610f\u56f3\u7684\u306b\u30c7\u30fc\u30bf\u3092\u6d41\u3055\u306a\u3044\u6642\u306b\u4f7f\u3044\u307e\u3059<\/ul>\n<pre class=\"post-pre\"><code><span class=\"k\">import<\/span> <span class=\"p\">{<\/span> <span class=\"k\">of<\/span> <span class=\"p\">}<\/span> <span class=\"k\">from<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">rxjs<\/span><span class=\"dl\">'<\/span><span class=\"p\">;<\/span>\r\n<span class=\"k\">import<\/span> <span class=\"p\">{<\/span> <span class=\"nx\">skip<\/span> <span class=\"p\">}<\/span> <span class=\"k\">from<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">rxjs\/operators<\/span><span class=\"dl\">'<\/span><span class=\"p\">;<\/span>\r\n\r\n<span class=\"kd\">const<\/span> <span class=\"nx\">cats<\/span> <span class=\"o\">=<\/span> <span class=\"k\">of<\/span><span class=\"p\">(<\/span><span class=\"dl\">'<\/span><span class=\"s1\">mike<\/span><span class=\"dl\">'<\/span><span class=\"p\">,<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">mike<\/span><span class=\"dl\">'<\/span><span class=\"p\">,<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">mike<\/span><span class=\"dl\">'<\/span> <span class=\"p\">,<\/span><span class=\"dl\">'<\/span><span class=\"s1\">mikeneko<\/span><span class=\"dl\">'<\/span><span class=\"p\">)<\/span> \r\n<span class=\"p\">.<\/span><span class=\"nx\">pipe<\/span><span class=\"p\">(<\/span>\r\n    <span class=\"nx\">skip<\/span><span class=\"p\">(<\/span><span class=\"mi\">2<\/span><span class=\"p\">),<\/span>\r\n<span class=\"p\">)<\/span>       \r\n<span class=\"p\">.<\/span><span class=\"nx\">subscribe<\/span><span class=\"p\">(<\/span>\r\n    <span class=\"nx\">cat<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"nx\">console<\/span><span class=\"p\">.<\/span><span class=\"nx\">log<\/span><span class=\"p\">(<\/span> <span class=\"s2\">`skip: <\/span><span class=\"p\">${<\/span><span class=\"nx\">cat<\/span><span class=\"p\">}<\/span><span class=\"s2\">`<\/span> <span class=\"p\">)<\/span> \r\n<span class=\"p\">);<\/span>\r\n\r\n<span class=\"c1\">\/\/skip: mike<\/span>\r\n<span class=\"c1\">\/\/skip: mikeneko<\/span>\r\n\r\n<\/code><\/pre>\n<h2>\u83b7\u53d6\u64cd\u4f5c\u7b26<\/h2>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u6307\u5b9a\u56de\u6570\u306e\u307f\u5b9f\u884c\u3059\u308b\u3068\u304d\u306b\u4f7f\u3044\u307e\u3059<\/ul>\n<\/li>\n<\/ul>\n<p>\u521d\u3081\u306e\u4e00\u56de\u306e\u307f\u5b9f\u884c\u3057\u305f\u3044\u306a\u3069<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">import<\/span> <span class=\"p\">{<\/span> <span class=\"k\">of<\/span> <span class=\"p\">}<\/span> <span class=\"k\">from<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">rxjs<\/span><span class=\"dl\">'<\/span><span class=\"p\">;<\/span>\r\n<span class=\"k\">import<\/span> <span class=\"p\">{<\/span> <span class=\"nx\">take<\/span> <span class=\"p\">}<\/span> <span class=\"k\">from<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">rxjs\/operators<\/span><span class=\"dl\">'<\/span><span class=\"p\">;<\/span>\r\n\r\n<span class=\"kd\">let<\/span> <span class=\"nx\">count<\/span> <span class=\"o\">=<\/span> <span class=\"mi\">0<\/span><span class=\"p\">;<\/span>\r\n<span class=\"kd\">const<\/span> <span class=\"nx\">cats<\/span> <span class=\"o\">=<\/span> <span class=\"k\">of<\/span><span class=\"p\">(<\/span><span class=\"dl\">'<\/span><span class=\"s1\">mike<\/span><span class=\"dl\">'<\/span><span class=\"p\">,<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">tama<\/span><span class=\"dl\">'<\/span><span class=\"p\">,<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">mike<\/span><span class=\"dl\">'<\/span> <span class=\"p\">,<\/span><span class=\"dl\">'<\/span><span class=\"s1\">mikeneko<\/span><span class=\"dl\">'<\/span><span class=\"p\">,<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">tama<\/span><span class=\"dl\">'<\/span><span class=\"p\">)<\/span> \r\n<span class=\"p\">.<\/span><span class=\"nx\">pipe<\/span><span class=\"p\">(<\/span>\r\n    <span class=\"nx\">take<\/span><span class=\"p\">(<\/span><span class=\"mi\">3<\/span><span class=\"p\">)<\/span>\r\n<span class=\"p\">)<\/span>       \r\n<span class=\"p\">.<\/span><span class=\"nx\">subscribe<\/span><span class=\"p\">(<\/span>\r\n    <span class=\"nx\">cat<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"nx\">console<\/span><span class=\"p\">.<\/span><span class=\"nx\">log<\/span><span class=\"p\">(<\/span> <span class=\"s2\">`take(<\/span><span class=\"p\">${<\/span><span class=\"o\">++<\/span><span class=\"nx\">count<\/span><span class=\"p\">}<\/span><span class=\"s2\">): <\/span><span class=\"p\">${<\/span><span class=\"nx\">cat<\/span><span class=\"p\">}<\/span><span class=\"s2\">`<\/span> <span class=\"p\">)<\/span> \r\n<span class=\"p\">);<\/span>\r\n\r\n<span class=\"c1\">\/\/take(1): mike<\/span>\r\n<span class=\"c1\">\/\/take(2): tama<\/span>\r\n<span class=\"c1\">\/\/take(3): mike<\/span>\r\n<\/code><\/pre>\n<h2>\u5b8c\u6210\u64cd\u4f5c\u7b26<\/h2>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u5f15\u6570\u3067\u6e21\u3057\u305f\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u95a2\u6570\u3092\u3001\u30b9\u30c8\u30ea\u30fc\u30e0\u304c\u6d41\u308c\u305f\u6700\u5f8c\u306b\u5b9f\u884c\u3057\u307e\u3059<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u30b9\u30c8\u30ea\u30fc\u30e0\u304c\u6d41\u308c\u305f\u6700\u5f8c\u306b\u51e6\u7406\u3092\u884c\u3046\u6642\u306b\u4f7f\u3044\u307e\u3059<\/ul>\n<\/li>\n<\/ul>\n<p>HTTP\u30ea\u30af\u30a8\u30b9\u30c8\u3067\u753b\u9762\u306b\u30ed\u30fc\u30c7\u30a3\u30f3\u30b0\u30a2\u30a4\u30b3\u30f3\u3092\u8868\u793a\u3057\u305f\u969b\u306b\u3001\u51e6\u7406\u306e\u518d\u5f8c\u306b\u30a2\u30a4\u30b3\u30f3\u3092\u975e\u8868\u793a\u306b\u3059\u308b\u306a\u3069<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">import<\/span> <span class=\"p\">{<\/span> <span class=\"nx\">interval<\/span> <span class=\"p\">}<\/span> <span class=\"k\">from<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">rxjs<\/span><span class=\"dl\">'<\/span><span class=\"p\">;<\/span>\r\n<span class=\"k\">import<\/span> <span class=\"p\">{<\/span> <span class=\"nx\">map<\/span><span class=\"p\">,<\/span> <span class=\"nx\">take<\/span><span class=\"p\">,<\/span> <span class=\"nx\">finalize<\/span> <span class=\"p\">}<\/span> <span class=\"k\">from<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">rxjs\/operators<\/span><span class=\"dl\">'<\/span><span class=\"p\">;<\/span>\r\n\r\n<span class=\"nx\">interval<\/span><span class=\"p\">(<\/span><span class=\"mi\">1000<\/span><span class=\"p\">)<\/span> <span class=\"c1\">\/\/ 1s\u305a\u3064\u30ab\u30a6\u30f3\u30c8\u30a2\u30c3\u30d7<\/span>\r\n<span class=\"p\">.<\/span><span class=\"nx\">pipe<\/span><span class=\"p\">(<\/span>\r\n    <span class=\"nx\">map<\/span><span class=\"p\">(<\/span><span class=\"nx\">index<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"s2\">`finalize(map): <\/span><span class=\"p\">${<\/span><span class=\"nx\">index<\/span> <span class=\"o\">+<\/span> <span class=\"mi\">1<\/span><span class=\"p\">}<\/span><span class=\"s2\">`<\/span><span class=\"p\">),<\/span>\r\n    <span class=\"nx\">take<\/span><span class=\"p\">(<\/span><span class=\"mi\">3<\/span><span class=\"p\">),<\/span>\r\n    <span class=\"nx\">finalize<\/span><span class=\"p\">(()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\r\n      <span class=\"nx\">setTimeout<\/span><span class=\"p\">(()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"nx\">console<\/span><span class=\"p\">.<\/span><span class=\"nx\">log<\/span><span class=\"p\">(<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">finalize!(\u02c6o\u02c6)<\/span><span class=\"dl\">'<\/span> <span class=\"p\">)<\/span> <span class=\"p\">,<\/span> <span class=\"mi\">100<\/span><span class=\"p\">);<\/span>\r\n    <span class=\"p\">}),<\/span>\r\n<span class=\"p\">)<\/span>       \r\n<span class=\"p\">.<\/span><span class=\"nx\">subscribe<\/span><span class=\"p\">(<\/span>\r\n    <span class=\"nx\">val<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"nx\">console<\/span><span class=\"p\">.<\/span><span class=\"nx\">log<\/span><span class=\"p\">(<\/span> <span class=\"s2\">`<\/span><span class=\"p\">${<\/span><span class=\"nx\">val<\/span><span class=\"p\">}<\/span><span class=\"s2\">`<\/span> <span class=\"p\">)<\/span> \r\n<span class=\"p\">);<\/span>\r\n\r\n<span class=\"c1\">\/\/ finalize(map): 1<\/span>\r\n<span class=\"c1\">\/\/ finalize(map): 2<\/span>\r\n<span class=\"c1\">\/\/ finalize(map): 3<\/span>\r\n<span class=\"c1\">\/\/ finalize!(\u02c6o\u02c6)<\/span>\r\n<\/code><\/pre>\n<h2>(\u53c3\u8003\u7db2\u7ad9)<\/h2>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u69d8\u3005\u306a\u30aa\u30da\u30ec\u30fc\u30bf\u306e\u52d5\u4f5c\u3092\u8996\u899a\u7684\u306b\u78ba\u8a8d\u3067\u304d\u307e\u3059?<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">RxJS marbles<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>\u8fd0\u8425\u5546\u662f\u6307 \u30aa\u30da\u30ec\u30fc\u30bf\u30fc\u306f\u3001 \u30ea\u30a2\u30af\u30c6\u30a3\u30d6\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0 \u3067\u3001Observable\u30af\u30e9\u30b9\u3067\u6271\u3046 \u30b9\u30c8\u30ea\u30fc\u30e0\u306e\u9ad8 [&hellip;]<\/p>\n","protected":false},"author":6,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-38722","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>\u3010Angular\u3011Angular\u7684\u64cd\u4f5c\u7b26\u603b\u7ed3 - 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\/\u3010angular\u3011angular\u7684\u64cd\u4f5c\u7b26\u603b\u7ed3\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u3010Angular\u3011Angular\u7684\u64cd\u4f5c\u7b26\u603b\u7ed3\" \/>\n<meta property=\"og:description\" content=\"\u8fd0\u8425\u5546\u662f\u6307 \u30aa\u30da\u30ec\u30fc\u30bf\u30fc\u306f\u3001 \u30ea\u30a2\u30af\u30c6\u30a3\u30d6\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0 \u3067\u3001Observable\u30af\u30e9\u30b9\u3067\u6271\u3046 \u30b9\u30c8\u30ea\u30fc\u30e0\u306e\u9ad8 [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/zh\/blog\/\u3010angular\u3011angular\u7684\u64cd\u4f5c\u7b26\u603b\u7ed3\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - Silicon Cloud\" \/>\n<meta property=\"article:published_time\" content=\"2022-12-12T05:40:34+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-05-04T06:04:37+00:00\" \/>\n<meta name=\"author\" content=\"\u6587, \u7fd4\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u4f5c\u8005\" \/>\n\t<meta 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