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<a class="article-title" href="/2019/06/17/Rxjs-3-用Subject实现多播/">Rxjs(3):用Subject实现多播</a>
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<h2 id="Cold-Observable"><a href="#Cold-Observable" class="headerlink" title="Cold Observable"></a>Cold Observable</h2><p>多个订阅者的消息来源于同一个消息源，这种情况在应用中是很普遍的，表面上一个Observable可以被多次订阅，但是实际上每一个订阅者的消息来源是不同的，它们都有着自己的消息源，一般的Observable都是Cold的，Cold Observable的数据流如果没有订阅者连产生都不会产生, 而没有一个订阅，都会单独产生一个数据流去满足它的订阅。</p>
<figure class="highlight typescript"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div><div class="line">20</div></pre></td><td class="code"><pre><div class="line"><span class="keyword">const</span> print = <span class="function"><span class="params">x</span> =></span> <span class="built_in">console</span>.log(x);</div><div class="line"><span class="keyword">const</span> numberObservable = timer(<span class="number">0</span>,<span class="number">1000</span>);</div><div class="line">numberObservable.pipe(</div><div class="line"> take(<span class="number">3</span>),</div><div class="line"> map(<span class="function"><span class="params">value</span> =></span> <span class="string">`A:<span class="subst">${value}</span>`</span>)</div><div class="line">).subscribe(print);</div><div class="line"></div><div class="line">setTimeout(<span class="function"><span class="params">()</span> =></span> numberObservable.pipe(</div><div class="line"> take(<span class="number">3</span>),</div><div class="line"> map(<span class="function"><span class="params">value</span> =></span> <span class="string">`B:<span class="subst">${value}</span>`</span>)</div><div class="line">).subscribe(print), <span class="number">2000</span>)</div><div class="line"></div><div class="line"><span class="comment">/*</span></div><div class="line">A:0</div><div class="line">A:1</div><div class="line">B:0</div><div class="line">A:2</div><div class="line">B:1</div><div class="line">B:2</div><div class="line">*/</div></pre></td></tr></table></figure>
<h2 id="Subject"><a href="#Subject" class="headerlink" title="Subject"></a>Subject</h2><p>把Cold Observable变为Hot Observable,我们需要为Cold Observable上一层包装,包装之后的数据还是一个Observable,只不过现在它的数据来源是被包装的那个Cold Observable,它的订阅者无论有多少，数据来源最终都是那一个源头。如何进行包装呢？在Rxjs中Subject类就专门解决这个问题。一个Subject即是Observable，可以被他人订阅，又是Observer订阅了他人。</p>
<p>我们用subject来将冷流变为热流，用一个subject对象作为一个冷流的订阅者,然后其他的订阅者再去订阅subject，让我们来看看会发生什么</p>
<figure class="highlight typescript"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div><div class="line">20</div><div class="line">21</div><div class="line">22</div><div class="line">23</div><div class="line">24</div></pre></td><td class="code"><pre><div class="line"><span class="keyword">let</span> observable = timer(<span class="number">0</span>,<span class="number">1000</span>);</div><div class="line"><span class="keyword">let</span> subject = <span class="keyword">new</span> Subject();</div><div class="line">observable.subscribe(subject);</div><div class="line"></div><div class="line"></div><div class="line">subject.pipe(</div><div class="line"> take(<span class="number">3</span>),</div><div class="line"> map(<span class="function"><span class="params">value</span> =></span> <span class="string">`A:<span class="subst">${value}</span>`</span>)</div><div class="line">).subscribe(print);</div><div class="line"></div><div class="line">setTimeout(<span class="function"><span class="params">()</span> =></span> subject.pipe(</div><div class="line"> take(<span class="number">3</span>),</div><div class="line"> map(<span class="function"><span class="params">value</span> =></span> <span class="string">`B:<span class="subst">${value}</span>`</span>)</div><div class="line">).subscribe(print), <span class="number">2000</span>)</div><div class="line"></div><div class="line"><span class="comment">/*</span></div><div class="line">A:0</div><div class="line">A:1</div><div class="line">A:2</div><div class="line">B:2</div><div class="line">B:3</div><div class="line">B:4</div><div class="line"> <-输出这里挂起了，流没有结束，因为实际的observable没有结束，虽然所有的订阅者都结束了，但是资源依旧没有被释放</div><div class="line">*/</div></pre></td></tr></table></figure>
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<article id="post-Rxjs-2-过滤流" class="article article-type-post article-index" itemscope itemprop="blogPost">
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<a class="article-title" href="/2019/06/16/Rxjs-2-过滤流/">Rxjs(2):过滤流</a>
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<h1 id="过滤数据流"><a href="#过滤数据流" class="headerlink" title="过滤数据流"></a>过滤数据流</h1><h2 id="First-last"><a href="#First-last" class="headerlink" title="First, last"></a>First, last</h2><h3 id="First"><a href="#First" class="headerlink" title="First"></a>First</h3><p>First是可以不带参数的，find和findIndex必须带过滤判断函数参数</p>
<figure class="highlight typescript"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div><div class="line">20</div><div class="line">21</div></pre></td><td class="code"><pre><div class="line"><span class="keyword">const</span> print = <span class="function"><span class="params">x</span> =></span> <span class="built_in">console</span>.log(x);</div><div class="line"><span class="keyword">let</span> observable = of(<span class="number">1</span>,<span class="number">2</span>,<span class="number">3</span>,<span class="number">4</span>,<span class="number">5</span>,<span class="number">6</span>);</div><div class="line"></div><div class="line">observable.pipe(</div><div class="line"> first()</div><div class="line">).subscribe(print);</div><div class="line"><span class="comment">//输出： 1</span></div><div class="line"></div><div class="line"><span class="comment">//first 同样可以带参数</span></div><div class="line">observable.pipe(</div><div class="line"> first(<span class="function"><span class="params">x</span> =></span> x % <span class="number">2</span> === <span class="number">0</span>)</div><div class="line">).subscribe(print);</div><div class="line"><span class="comment">//输出： 2</span></div><div class="line"></div><div class="line"><span class="comment">//first可以传入的函数可以带有一个index参数，来表示当前遍历的元素的位置</span></div><div class="line">observable.pipe(</div><div class="line"> first(</div><div class="line"> <span class="function">(<span class="params">value, index</span>) =></span> value % <span class="number">2</span> === <span class="number">0</span> && index > <span class="number">2</span>,</div><div class="line"> )</div><div class="line">).subscribe(print);</div><div class="line"><span class="comment">//输出4</span></div></pre></td></tr></table></figure>
<p>First的第二个参数是一个可选函数参数，如果没有符合判断的第一个元素，那么我们就返回一个默认元素</p>
<figure class="highlight typescript"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div></pre></td><td class="code"><pre><div class="line">observable.pipe(</div><div class="line"> first(</div><div class="line"> <span class="function"><span class="params">x</span> =></span> x % <span class="number">6</span> === <span class="number">0</span>,</div><div class="line"> <span class="string">'nothing'</span></div><div class="line"> )</div><div class="line">).subscribe(print);</div><div class="line"><span class="comment">//输出： nothing</span></div></pre></td></tr></table></figure>
<h3 id="last"><a href="#last" class="headerlink" title="last"></a>last</h3><p>last和first基本功能相反，但是last必须等到上游结束后才会吐出数据，因为上游没有结束我们就不知道当前拿到 的是不是最后一个元素。</p>
<figure class="highlight typescript"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div></pre></td><td class="code"><pre><div class="line">timer(<span class="number">0</span>, <span class="number">100</span>).pipe(</div><div class="line"> take(<span class="number">8</span>),</div><div class="line"> tap(print),</div><div class="line"> last(</div><div class="line"> <span class="function">(<span class="params">value, index</span>) =></span> value % <span class="number">2</span> === <span class="number">0</span></div><div class="line"> )</div><div class="line">).subscribe(print);</div><div class="line"></div><div class="line"><span class="comment">/*</span></div><div class="line">0</div><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7 <- tap打出了最后一个元素</div><div class="line">6 <- subscirbe输出last过滤的结果</div><div class="line">*/</div></pre></td></tr></table></figure>
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<a class="article-title" href="/2019/04/27/RXjs-1-combination/">RXjs(1): combination</a>
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<h1 id="合并数据流"><a href="#合并数据流" class="headerlink" title="合并数据流"></a>合并数据流</h1><p>## concat：首尾相连<br><figure class="highlight typescript"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div></pre></td><td class="code"><pre><div class="line"><span class="keyword">import</span> {concat, defer, interval, never, Observable, of} <span class="keyword">from</span> <span class="string">"rxjs"</span>;</div><div class="line"></div><div class="line"><span class="comment">// concat会在前一个observable完结之后,去订阅后一个observable，如果前一个observable不完结，那么永远没有机会订阅后一个</span></div><div class="line"></div><div class="line"><span class="keyword">let</span> nextFunc = <span class="function"><span class="params">next</span> =></span> <span class="built_in">console</span>.log(next)</div><div class="line"></div><div class="line"><span class="keyword">let</span> observable = defer(<span class="function"><span class="params">()</span> =></span> {</div><div class="line"> <span class="built_in">console</span>.log(<span class="string">"observable has been subscribed"</span>);</div><div class="line"> <span class="keyword">return</span> of(<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>)</div><div class="line">});</div><div class="line"><span class="comment">//不输出任何日志，因为never永远不会完结，下游的数据永远也不会被subscribe，所以什么也不输出</span></div><div class="line">concat(never(), observable).subscribe(nextFunc);</div><div class="line"><span class="comment">//输出1,2,3</span></div><div class="line">concat(observable, never()).subscribe(nextFunc);</div><div class="line"></div><div class="line">concat(interval(<span class="number">1000</span>), observable).subscribe(nextFunc);</div></pre></td></tr></table></figure></p>
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<article id="post-RXjs-0-creator" class="article article-type-post article-index" itemscope itemprop="blogPost">
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<a class="article-title" href="/2019/04/20/RXjs-0-creator/">RXjs(0): creator</a>
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<time datetime="2019-04-20T09:30:43.000Z" itemprop="datePublished"><i class="icon-calendar icon"></i>2019-04-20</time>
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<h1 id="创建数据流"><a href="#创建数据流" class="headerlink" title="创建数据流"></a>创建数据流</h1><h2 id="同步创建数据流"><a href="#同步创建数据流" class="headerlink" title="同步创建数据流"></a>同步创建数据流</h2><p>在一般情形下我们很少去主动创建同步的数据流，创建同步数据流一般是在写测试，写例子的时候<br>rxjs之所以能够被称为前端编程中的’屠龙刀’，很大程度上是因为它处理异步数据流的简便性</p>
<h3 id="of"><a href="#of" class="headerlink" title="of"></a>of</h3><figure class="highlight typescript"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div></pre></td><td class="code"><pre><div class="line"><span class="comment">// 自定义一个流的内容</span></div><div class="line"><span class="keyword">let</span> of$ = of(<span class="number">1</span>,<span class="number">2</span>,<span class="number">3</span>,<span class="number">4</span>);</div><div class="line">of$.subscribe(</div><div class="line"> <span class="function">(<span class="params">next</span>) =></span> <span class="built_in">console</span>.log(next)</div><div class="line">);</div></pre></td></tr></table></figure>
<h3 id="Range"><a href="#Range" class="headerlink" title="Range"></a>Range</h3><figure class="highlight plain"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div></pre></td><td class="code"><pre><div class="line">// range是给定一个初始值，往后加1</div><div class="line">let range$ = range(1,4);</div><div class="line">range$.subscribe(</div><div class="line"> (next) => console.log(next)</div><div class="line">);</div></pre></td></tr></table></figure>
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<a class="article-title" href="/2019/03/18/Typescript-7-Decorators/">Typescript(7): Decorators</a>
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<p>装饰器是一种我们能够在类的声明和成员上通过元编程语法添加标注的方式，不过不管在ts（3.1）和还是在js中它都是处于试验阶段的。</p>
<p>如果要启用实验性的装饰器特性，我们需要在命令行或者tsconfig.json里启用experimentalDecorators编译器选项。</p>
<figure class="highlight typescript"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div></pre></td><td class="code"><pre><div class="line"><span class="comment">//命令行中加入编译选项参数</span></div><div class="line">tsc --target ES5 --experimentalDecorators</div><div class="line"></div><div class="line"><span class="comment">//tsconfig.json</span></div><div class="line">{</div><div class="line"> <span class="string">"compilerOptions"</span>: {</div><div class="line"> <span class="string">"target"</span>: <span class="string">"ES5"</span>,</div><div class="line"> <span class="string">"experimentalDecorators"</span>: <span class="literal">true</span></div><div class="line"> }</div><div class="line">}</div></pre></td></tr></table></figure>
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