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<a class="article-title" href="/2019/04/19/async函数整理/">async函数总结</a>
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<h3 id="1、什么是async函数："><a href="#1、什么是async函数：" class="headerlink" title="1、什么是async函数："></a>1、什么是async函数：</h3><p>async函数是js处理异步函数的最终解决方案，它的语法看起来是用同步的代码结构来描述异步的代码。async函数返回值是一个成功或者失败状态的Promise，但必须等到内部所有的Promise执行完以后，才会发生状态改变。</p>
<h4 id="1-1、-async函数的优点"><a href="#1-1、-async函数的优点" class="headerlink" title="1.1、 async函数的优点"></a>1.1、 async函数的优点</h4><p>async/await是Generator函数的语法糖，相比之下会有如下优点：</p>
<h5 id="1、内置执行器："><a href="#1、内置执行器：" class="headerlink" title="1、内置执行器："></a>1、内置执行器：</h5><p>async函数自带执行器，不需要调用next()方法。</p>
<h5 id="2、更好的语义："><a href="#2、更好的语义：" class="headerlink" title="2、更好的语义："></a>2、更好的语义：</h5><p>async/await相对与*/yield来说有更好的语义</p>
<h5 id="3、更好的适用性："><a href="#3、更好的适用性：" class="headerlink" title="3、更好的适用性："></a>3、更好的适用性：</h5><p>对于yield，后面只能是thunk或者promise函数。而await后面可以是promise和原始类型值，如果不是Promise的话，会将其默认转化为Promise</p>
<h5 id="4、返回值是promise"><a href="#4、返回值是promise" class="headerlink" title="4、返回值是promise"></a>4、返回值是promise</h5><p>async函数返回值是promise类型，而Generator函数必须是Iterator 对象</p>
<h3 id="2、async函数的语法"><a href="#2、async函数的语法" class="headerlink" title="2、async函数的语法"></a>2、async函数的语法</h3><h4 id="2-1-async函数结构表达式："><a href="#2-1-async函数结构表达式：" class="headerlink" title="2.1 async函数结构表达式："></a>2.1 async函数结构表达式：</h4><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">async function name([param[, param[, ... param]]]) {</span><br><span class="line"> statements</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<p>eg:</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br></pre></td><td class="code"><pre><span class="line">function resolveAfter2Seconds() {</span><br><span class="line"> return new Promise(resolve => {</span><br><span class="line"> setTimeout(() => {</span><br><span class="line"> resolve('resolved');</span><br><span class="line"> }, 2000);</span><br><span class="line"> });</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line">async function asyncCall() {</span><br><span class="line"> console.log('calling');</span><br><span class="line"> var result = await resolveAfter2Seconds();</span><br><span class="line"> console.log(result);</span><br><span class="line"> // expected output: 'resolved'</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line">asyncCall();</span><br><span class="line">// 'calling'</span><br><span class="line">// after 2 second</span><br><span class="line">//resolved</span><br></pre></td></tr></table></figure>
<h4 id="2-2、async函数的注意事项"><a href="#2-2、async函数的注意事项" class="headerlink" title="2.2、async函数的注意事项"></a>2.2、async函数的注意事项</h4><p>async函数中await可以暂停函数的执行，等到异步函数返回执行结果的时候再继续执行函数。</p>
<p>await关键字只能用在async函数中，用在其它地方会抛错。</p>
<p>async函数不同于promise函数，函数中使用return不是必须的，如果含有return，则返回的Promise中的promiseValue的值不为undefide。否则依旧会返回一个promiseValue为空的Promise。</p>
<h4 id="3、async函数的错误处理机制"><a href="#3、async函数的错误处理机制" class="headerlink" title="3、async函数的错误处理机制"></a>3、async函数的错误处理机制</h4><p>在async函数中，如果await后面的异步函数中抛出错，则async函数剩余的函数都将不会执行。</p>
<p>如下所示：<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line">async function f() {</span><br><span class="line"> await Promise.reject('出错了');</span><br><span class="line"> await Promise.resolve('hello world'); // 不会执行</span><br><span class="line">}</span><br></pre></td></tr></table></figure></p>
<p>有时候我们希望一个await函数执行失败后，不要影响其它函数的执行。可以将await用try{}catch(){}包起来。</p>
<p>如下所示：<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br></pre></td><td class="code"><pre><span class="line">async function f() {</span><br><span class="line"> try {</span><br><span class="line"> await Promise.reject('出错了');</span><br><span class="line"> } catch(e) {</span><br><span class="line"> console.log(e)</span><br><span class="line"> }</span><br><span class="line"> return await Promise.resolve('hello world');</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line">f()</span><br><span class="line">.then(v => console.log(v))</span><br><span class="line">// hello world</span><br></pre></td></tr></table></figure></p>
<h4 id="4、async函数并发执行"><a href="#4、async函数并发执行" class="headerlink" title="4、async函数并发执行"></a>4、async函数并发执行</h4><p>当多个await命令后的函数之间没有依赖关系的时候，可以考虑让它们并发的执行：</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br></pre></td><td class="code"><pre><span class="line">var resolveAfter2Seconds = function() {</span><br><span class="line"> console.log("starting slow promise");</span><br><span class="line"> return new Promise(resolve => {</span><br><span class="line"> setTimeout(function() {</span><br><span class="line"> resolve("slow");</span><br><span class="line"> console.log("slow promise is done");</span><br><span class="line"> }, 2000);</span><br><span class="line"> });</span><br><span class="line">};</span><br><span class="line"></span><br><span class="line">var resolveAfter1Second = function() {</span><br><span class="line"> console.log("starting fast promise");</span><br><span class="line"> return new Promise(resolve => {</span><br><span class="line"> setTimeout(function() {</span><br><span class="line"> resolve("fast");</span><br><span class="line"> console.log("fast promise is done");</span><br><span class="line"> }, 1000);</span><br><span class="line"> });</span><br><span class="line">};</span><br><span class="line">var sequentialStart = async function() {</span><br><span class="line"> console.log('==SEQUENTIAL START==');</span><br><span class="line"></span><br><span class="line"> // 1. Execution gets here almost instantly</span><br><span class="line"> const slow = await resolveAfter2Seconds();</span><br><span class="line"> console.log(slow); // 2. this runs 2 seconds after 1.</span><br><span class="line"></span><br><span class="line"> const fast = await resolveAfter1Second();</span><br><span class="line"> console.log(fast); // 3. this runs 3 seconds after 1.</span><br><span class="line">}</span><br><span class="line">// sequentialStart函数执行完需要三秒，两个无关的函数顺序执行</span><br><span class="line"></span><br><span class="line">var concurrentStart = async function() {</span><br><span class="line"> console.log('==CONCURRENT START with await==');</span><br><span class="line"> const slow = resolveAfter2Seconds(); // starts timer immediately</span><br><span class="line"> const fast = resolveAfter1Second(); // starts timer immediately</span><br><span class="line"></span><br><span class="line"> // 1. Execution gets here almost instantly</span><br><span class="line"> console.log(await slow); // 2. this runs 2 seconds after 1.</span><br><span class="line"> console.log(await fast); // 3. this runs 2 seconds after 1., immediately after 2., since fast is already resolved</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line">var concurrentPromise = function() {</span><br><span class="line"> console.log('==CONCURRENT START with Promise.all==');</span><br><span class="line"> return Promise.all([resolveAfter2Seconds(), resolveAfter1Second()]).then((messages) => {</span><br><span class="line"> console.log(messages[0]); // slow</span><br><span class="line"> console.log(messages[1]); // fast</span><br><span class="line"> });</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<p>concurrentStart和concurrentPromise是两种异步函数无耦合的情况的下并发执行的方式：</p>
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<a class="article-title" href="/2019/04/19/Promise整理/">Promise整理</a>
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<a href="/2019/04/19/Promise整理/" class="archive-article-date">
<time datetime="2019-04-19T15:16:22.422Z" itemprop="datePublished"><i class="icon-calendar icon"></i>2019-04-19</time>
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<h3 id="1、使用promise的原因"><a href="#1、使用promise的原因" class="headerlink" title="1、使用promise的原因"></a>1、使用promise的原因</h3><p>解决回调函数多层嵌套，让异步方法可以像同步方法那样返回值，使代码更易读。</p>
<h3 id="2、promise的三种状态"><a href="#2、promise的三种状态" class="headerlink" title="2、promise的三种状态"></a>2、promise的三种状态</h3><p>pending: 初始状态，既不是成功，也不是失败状态。</p>
<p>fulfilled: 意味着操作成功完成。</p>
<p>rejected: 意味着操作失败。</p>
<h3 id="3、promise语法："><a href="#3、promise语法：" class="headerlink" title="3、promise语法："></a>3、promise语法：</h3><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">new Promise( function(resolve, reject) {...} /* executor */ );</span><br></pre></td></tr></table></figure>
<p>promise参数 executor</p>
<p>executor执行器函数包括两个参数resolve 和 reject，Promise构造函数执行时会立即调用exector函数，resolve 和 reject函数会被当作参数传给exector函数。exector函数一般会执行一些异步函数，异步函数调用的成功和失败分别调用resolve函数和reject函数，将promise状态分别转为fulfiled和rejected状态。</p>
<p><strong>eg:</strong><br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line">function myAsyncFunction(url) {</span><br><span class="line"> return new Promise((resolve, reject) => {</span><br><span class="line"> const xhr = new XMLHttpRequest();</span><br><span class="line"> xhr.open("GET", url);</span><br><span class="line"> xhr.onload = () => resolve(xhr.responseText);</span><br><span class="line"> xhr.onerror = () => reject(xhr.statusText);</span><br><span class="line"> xhr.send();</span><br><span class="line"> });</span><br><span class="line">};</span><br></pre></td></tr></table></figure></p>
<h4 id="3-1、promise在事件轮循的注意事项："><a href="#3-1、promise在事件轮循的注意事项：" class="headerlink" title="3.1、promise在事件轮循的注意事项："></a>3.1、promise在事件轮循的注意事项：</h4><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br></pre></td><td class="code"><pre><span class="line">new Promise(function(resolve, reject){</span><br><span class="line"> console.log('hello');</span><br><span class="line"> resolve(24);</span><br><span class="line"> console.log('world');</span><br><span class="line">}).then(value => console.log(value));</span><br><span class="line">console.log('number');</span><br><span class="line">/*</span><br><span class="line">hello</span><br><span class="line">world</span><br><span class="line">number</span><br><span class="line">24</span><br><span class="line">*/</span><br></pre></td></tr></table></figure>
<p>Promise本身是同步的立即执行函数，在执行到resolve()的时候属于异步操作，会把参数传给.then(),并将它放到微任务异步队列里。所以当executor函数中执行完同步操作后，console.log(‘number’)被放到函数调用栈，调用栈的宏观同步任务执行完后，会去微任务队列里取微任务到调用栈。</p>
<h3 id="4、Promise-prototype-then-onFulfilled-onRejected"><a href="#4、Promise-prototype-then-onFulfilled-onRejected" class="headerlink" title="4、Promise.prototype.then(onFulfilled, onRejected)"></a>4、Promise.prototype.then(onFulfilled, onRejected)</h3><p>当new Promise((resolve,reject) => resolve())的时候对应执行then操作，代表Promise的成功状态(fulfilled)。</p>
<p>当Promise变成接受状态（fulfilled）时，onFulfilled参数作为回调函数被调用。</p>
<p>当Promise变成拒绝状态（rejected ）时，onRejected参数作为回调函数被调用。此时等价与.catch()功能</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line">var p = new Promise((resolve, reject) => {</span><br><span class="line"> resolve('foo')</span><br><span class="line">})</span><br><span class="line"></span><br><span class="line">// 'bar' 不是函数，会在内部被替换为 (x) => x</span><br><span class="line">p.then('bar').then((value) => {</span><br><span class="line"> console.log(value) // 'foo'</span><br><span class="line">})</span><br></pre></td></tr></table></figure>
<p>.then()的参数如果只有一个字符串的话，此时可以忽略这个参数。<br>.then(String) <=> .then((value) => value) 其中value代表Promise的返回值。</p>
<h4 id="4-1、promise-then-的注意事项："><a href="#4-1、promise-then-的注意事项：" class="headerlink" title="4.1、promise.then()的注意事项："></a>4.1、promise.then()的注意事项：</h4><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br></pre></td><td class="code"><pre><span class="line">Promise.resolve()</span><br><span class="line"> .then( () => {</span><br><span class="line"> // 使 .then() 返回一个 rejected promise</span><br><span class="line"> throw 'Oh no!';</span><br><span class="line"> })</span><br><span class="line"> .catch( reason => {</span><br><span class="line"> console.error( 'onRejected function called: ', reason );</span><br><span class="line"> })</span><br><span class="line"> .then( () => {</span><br><span class="line"> console.log( "I am always called even if the prior then's promise rejects" );</span><br><span class="line"> });</span><br></pre></td></tr></table></figure>
<p>当promise.then()返回的状态是rejected promise 的时候这个时候会被catch()捕获，<br>这时候只要catch中不返回rejected。此时都会执行后面的then操作。</p>
<h4 id="4-2-注意promise和setTimeOut-的优先级："><a href="#4-2-注意promise和setTimeOut-的优先级：" class="headerlink" title="4.2 注意promise和setTimeOut()的优先级："></a>4.2 注意promise和setTimeOut()的优先级：</h4><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br></pre></td><td class="code"><pre><span class="line">Promise.resolve("foo")</span><br><span class="line"> // 1. 接收 "foo" 并与 "bar" 拼接，并将其结果做为下一个resolve返回。</span><br><span class="line"> .then(function(string) {</span><br><span class="line"> return new Promise(function(resolve, reject) {</span><br><span class="line"> setTimeout(function() {</span><br><span class="line"> string += 'bar';</span><br><span class="line"> resolve(string);</span><br><span class="line"> }, 1);</span><br><span class="line"> });</span><br><span class="line"> })</span><br><span class="line"> // 2. 接收 "foobar", 放入一个异步函数中处理该字符串</span><br><span class="line"> // 并将其打印到控制台中, 但是不将处理后的字符串返回到下一个。</span><br><span class="line"> .then(function(string) {</span><br><span class="line"> setTimeout(function() {</span><br><span class="line"> string += 'baz';</span><br><span class="line"> console.log(string);</span><br><span class="line"> }, 1)</span><br><span class="line"> return string;</span><br><span class="line"> })</span><br><span class="line"> // 3. 打印本节中代码将如何运行的帮助消息，</span><br><span class="line"> // 字符串实际上是由上一个回调函数之前的那块异步代码处理的。</span><br><span class="line"> .then(function(string) {</span><br><span class="line"> console.log("Last Then: oops... didn't bother to instantiate and return " +</span><br><span class="line"> "a promise in the prior then so the sequence may be a bit " +</span><br><span class="line"> "surprising");</span><br><span class="line"></span><br><span class="line"> // 注意 `string` 这时不会存在 'baz'。</span><br><span class="line"> // 因为这是发生在我们通过setTimeout模拟的异步函数中。</span><br><span class="line"> console.log(string);</span><br><span class="line">});</span><br></pre></td></tr></table></figure>
<p>第一个then()方法中返回了一个新定义的Promise对象，等待1ms后返回一个promiseValue为foobar的值和fulfiled状态。此时执行下一个then(),把foobar传给浏览器定时器API，然后将它放入宏任务异步队列中，return string进入函数调用栈，将值传给下一个then(),此时将then()中的onFulfilled函数放入微任务队列中，此时调用栈为空。微任务队列中只有第三个.then()的内容，将微任务队列清空，将其中的同步代码放入调用栈，打印两个console.log()语句到控制台。最后执行宏任务队列中的setTimeOut()的回调函数。</p>
<h3 id="5、Promise-prototype-catch-onRejected"><a href="#5、Promise-prototype-catch-onRejected" class="headerlink" title="5、Promise.prototype.catch(onRejected)"></a>5、Promise.prototype.catch(onRejected)</h3><p>当返回一个rejected promise的时候，或者throw出一个错，此时会被catch()捕获<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line">var p1 = new Promise(function(resolve, reject) {</span><br><span class="line"> throw 'Uh-oh!';</span><br><span class="line">}).catch();</span><br><span class="line"><=></span><br><span class="line">var p1 = new Promise(function(resolve, reject) {</span><br><span class="line"> return Promise.reject('Uh-oh!');</span><br><span class="line">}).catch();</span><br></pre></td></tr></table></figure></p>
<h4 id="5-1、catch-的注意事项；"><a href="#5-1、catch-的注意事项；" class="headerlink" title="5.1、catch()的注意事项；"></a>5.1、catch()的注意事项；</h4><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br></pre></td><td class="code"><pre><span class="line">// 在异步函数中抛出的错误不会被catch捕获到</span><br><span class="line">var p2 = new Promise(function(resolve, reject) {</span><br><span class="line"> setTimeout(function() {</span><br><span class="line"> throw 'Uncaught Exception!';</span><br><span class="line"> }, 1000);</span><br><span class="line">});</span><br><span class="line"></span><br><span class="line">p2.catch(function(e) {</span><br><span class="line"> console.log(e); // 不会执行</span><br><span class="line">});</span><br><span class="line"></span><br><span class="line">// 在resolve()后面抛出的错误会被忽略</span><br><span class="line">var p3 = new Promise(function(resolve, reject) {</span><br><span class="line"> resolve();</span><br><span class="line"> throw 'Silenced Exception!';</span><br><span class="line">});</span><br><span class="line"></span><br><span class="line">p3.catch(function(e) {</span><br><span class="line"> console.log(e); // 不会执行</span><br><span class="line">});</span><br></pre></td></tr></table></figure>
<p>在异步函数中抛错之所以无法被catch到的原因是：new Promise是同步的立即执行函数，执行到setTimeout函数，将它放到宏任务异步队列中，宏任务异步队列的执行优先级最低。只有当微任务异步队列和函数调用栈队列为空时才会调用。当setTimeout函数执行时，外部已经没有代码可以接到它所抛出的错误。所以异步回调函数抛出的错总是因为函数调用栈为空，没有代码可以承接错误而导致无法被捕获到。</p>
<h3 id="6、Promise-prototype-all-iterable"><a href="#6、Promise-prototype-all-iterable" class="headerlink" title="6、Promise.prototype.all(iterable)"></a>6、Promise.prototype.all(iterable)</h3><p>当promise.all()内没有参数的时候，返回一个已完成状态的promise。</p>
<p>如果所有传入的 promise 都变为完成状态，或者传入的可迭代对象内没有 promise，Promise.all 返回的 promise 异步地变为完成。</p>
<p>在任何情况下，Promise.all 返回的 promise 的完成状态的结果都是一个数组</p>
<p>如果传入的 promise 中有一个失败（rejected），promise.all 异步地将失败的那个结果给失败状态的回调函数，而不管其它 promise 是否完成。</p>
<h4 id="6-1-Promise-all-的注意事项"><a href="#6-1-Promise-all-的注意事项" class="headerlink" title="6.1 Promise.all()的注意事项"></a>6.1 Promise.all()的注意事项</h4><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br></pre></td><td class="code"><pre><span class="line">const p1 = new Promise((resolve, reject) => {</span><br><span class="line"> resolve('hello');</span><br><span class="line">})</span><br><span class="line">.then(result => result)</span><br><span class="line">.catch(e => e);</span><br><span class="line"></span><br><span class="line">const p2 = new Promise((resolve, reject) => {</span><br><span class="line"> throw new Error('报错了');</span><br><span class="line">})</span><br><span class="line">.then(result => result)</span><br><span class="line">.catch(e => e);</span><br><span class="line"></span><br><span class="line">Promise.all([p1, p2])</span><br><span class="line">.then(result => console.log(result))</span><br><span class="line">.catch(e => console.log(e));</span><br><span class="line">// ["hello", Error: 报错了]</span><br></pre></td></tr></table></figure>
<p>当p1执行成功状态变为resolved，p2执行的时候会出错跳到catch()，执行完状态也会变为resolved，所以Promise.all()可以正常执行。</p>
<p>如果p2没有catch的化，状态还是rejected，此时的Promise.all()不会执行。</p>
<h3 id="7、Promise-prototype-race-iterable"><a href="#7、Promise-prototype-race-iterable" class="headerlink" title="7、Promise.prototype.race(iterable)"></a>7、Promise.prototype.race(iterable)</h3><p>Promise.race(iterable) 方法返回一个 promise，一旦迭代器中的某个promise解决或拒绝，就会返回一个解决状态或拒绝状态的promise。简言之，以最先返回结果的promise的状态为准。</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br></pre></td><td class="code"><pre><span class="line">var p3 = new Promise(function(resolve, reject) { </span><br><span class="line"> setTimeout(resolve, 100, "three");</span><br><span class="line">});</span><br><span class="line">var p4 = new Promise(function(resolve, reject) { </span><br><span class="line"> setTimeout(reject, 500, "four"); </span><br><span class="line">});</span><br><span class="line"></span><br><span class="line">Promise.race([p3, p4]).then(function(value) {</span><br><span class="line"> console.log(value); // "three"</span><br><span class="line"> // p3 更快，所以它完成了 </span><br><span class="line">}, function(reason) {</span><br><span class="line"> // 未被调用</span><br><span class="line">});</span><br></pre></td></tr></table></figure>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br></pre></td><td class="code"><pre><span class="line">var promise1 = new Promise(function(resolve, reject) {</span><br><span class="line"> setTimeout(resolve, 500, 'one');</span><br><span class="line">});</span><br><span class="line"></span><br><span class="line">var promise2 = new Promise(function(resolve, reject) {</span><br><span class="line"> setTimeout(resolve, 100, 'two');</span><br><span class="line">});</span><br><span class="line"></span><br><span class="line">Promise.race([promise1, promise2]).then(function(value) {</span><br><span class="line"> console.log(value);</span><br><span class="line"> // Both resolve, but promise2 is faster</span><br><span class="line">});</span><br><span class="line">// expected output: "two"</span><br></pre></td></tr></table></figure>
<h3 id="8、创建已处理的Promise"><a href="#8、创建已处理的Promise" class="headerlink" title="8、创建已处理的Promise"></a>8、创建已处理的Promise</h3><h4 id="8-1-Promise-resolve-value"><a href="#8-1-Promise-resolve-value" class="headerlink" title="8.1 Promise.resolve(value)"></a>8.1 Promise.resolve(value)</h4><p>value的值分多种情况，当value的值是Promise，此时Promise.resolve()不起作用，返回的promise状态和value的最后状态保持一致。当value是thenable（带有then方法），返回的promise会“跟随”这个thenable的对象，采用它的最终状态。其它情况返回成功状态的promise。</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">Promise.resolve(value);</span><br><span class="line">Promise.resolve(promise);</span><br><span class="line">Promise.resolve(thenable);</span><br></pre></td></tr></table></figure>
<p>thenable函数使用第一参数函数返回一个成功状态的promise,使用第二个参数函数返回一个失败的promise。</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line">var p1 = Promise.resolve({ </span><br><span class="line"> then: function(test, rej) { rej("rejected!"); }</span><br><span class="line">});</span><br><span class="line">console.log(p1 instanceof Promise) // true, 这是一个Promise对象</span><br><span class="line"></span><br><span class="line">p1.then(function(v) {</span><br><span class="line"> console.log(v); </span><br><span class="line"> }, function(e) {</span><br><span class="line"> console.log(e) //rejected</span><br><span class="line">})</span><br></pre></td></tr></table></figure>
<h4 id="8-2-Promise-reject-reason"><a href="#8-2-Promise-reject-reason" class="headerlink" title="8.2 Promise.reject(reason)"></a>8.2 Promise.reject(reason)</h4><p>Promise.reject返回一个被拒绝的Promise对象，<br>参数代表被拒绝的原因。</p>
<p>Promise.reject(reason).catch((reason) => …);</p>
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<a class="article-title" href="/2019/04/19/hello-world/">Hello World</a>
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<p>Welcome to <a href="https://hexo.io/" target="_blank" rel="noopener">Hexo</a>! This is your very first post. Check <a href="https://hexo.io/docs/" target="_blank" rel="noopener">documentation</a> for more info. If you get any problems when using Hexo, you can find the answer in <a href="https://hexo.io/docs/troubleshooting.html" target="_blank" rel="noopener">troubleshooting</a> or you can ask me on <a href="https://github.com/hexojs/hexo/issues" target="_blank" rel="noopener">GitHub</a>.</p>
<h2 id="Quick-Start"><a href="#Quick-Start" class="headerlink" title="Quick Start"></a>Quick Start</h2><h3 id="Create-a-new-post"><a href="#Create-a-new-post" class="headerlink" title="Create a new post"></a>Create a new post</h3><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">$ hexo new <span class="string">"My New Post"</span></span><br></pre></td></tr></table></figure>
<p>More info: <a href="https://hexo.io/docs/writing.html" target="_blank" rel="noopener">Writing</a></p>
<h3 id="Run-server"><a href="#Run-server" class="headerlink" title="Run server"></a>Run server</h3><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">$ hexo server</span><br></pre></td></tr></table></figure>
<p>More info: <a href="https://hexo.io/docs/server.html" target="_blank" rel="noopener">Server</a></p>
<h3 id="Generate-static-files"><a href="#Generate-static-files" class="headerlink" title="Generate static files"></a>Generate static files</h3><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">$ hexo generate</span><br></pre></td></tr></table></figure>
<p>More info: <a href="https://hexo.io/docs/generating.html" target="_blank" rel="noopener">Generating</a></p>
<h3 id="Deploy-to-remote-sites"><a href="#Deploy-to-remote-sites" class="headerlink" title="Deploy to remote sites"></a>Deploy to remote sites</h3><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">$ hexo deploy</span><br></pre></td></tr></table></figure>
<p>More info: <a href="https://hexo.io/docs/deployment.html" target="_blank" rel="noopener">Deployment</a></p>
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缺失模块。<br>1、请确保node版本大于6.2<br>2、在博客根目录（注意不是yilia根目录）执行以下命令：<br> npm i hexo-generator-json-content --save<br><br>
3、在根目录_config.yml里添加配置：
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jsonContent:
meta: false
pages: false
posts:
title: true
date: true
path: true
text: false
raw: false
content: false
slug: false
updated: false
comments: false
link: false
permalink: false
excerpt: false
categories: false
tags: true
</pre>
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</p>
<p class="search-tag">
<i class="icon-price-tags icon"></i>
<span q-repeat="tags" q-on="click:choseTag(e, name)" q-text="name|tagformat"></span>
</p>
</li>
</ul>
</section>
<section class="tools-section tools-section-friends" q-show="friends">
<ul class="search-ul">
<li class="search-li">
<a href="http://localhost:4000/" target="_blank" class="search-title"><i class="icon-quo-left icon"></i>友情链接1</a>
</li>
<li class="search-li">
<a href="http://localhost:4000/" target="_blank" class="search-title"><i class="icon-quo-left icon"></i>友情链接2</a>
</li>
<li class="search-li">
<a href="http://localhost:4000/" target="_blank" class="search-title"><i class="icon-quo-left icon"></i>友情链接3</a>
</li>
<li class="search-li">
<a href="http://localhost:4000/" target="_blank" class="search-title"><i class="icon-quo-left icon"></i>友情链接4</a>
</li>
<li class="search-li">
<a href="http://localhost:4000/" target="_blank" class="search-title"><i class="icon-quo-left icon"></i>友情链接5</a>
</li>
<li class="search-li">
<a href="http://localhost:4000/" target="_blank" class="search-title"><i class="icon-quo-left icon"></i>友情链接6</a>
</li>
</ul>
</section>
<section class="tools-section tools-section-me" q-show="aboutme">
<div class="aboutme-wrap" id="js-aboutme">很惭愧<br><br>只做了一点微小的工作<br>谢谢大家</div>
</section>
</div>
</div>
<!-- Root element of PhotoSwipe. Must have class pswp. -->
<div class="pswp" tabindex="-1" role="dialog" aria-hidden="true">
<!-- Background of PhotoSwipe.
It's a separate element as animating opacity is faster than rgba(). -->
<div class="pswp__bg"></div>
<!-- Slides wrapper with overflow:hidden. -->
<div class="pswp__scroll-wrap">
<!-- Container that holds slides.
PhotoSwipe keeps only 3 of them in the DOM to save memory.
Don't modify these 3 pswp__item elements, data is added later on. -->
<div class="pswp__container">
<div class="pswp__item"></div>
<div class="pswp__item"></div>
<div class="pswp__item"></div>
</div>
<!-- Default (PhotoSwipeUI_Default) interface on top of sliding area. Can be changed. -->
<div class="pswp__ui pswp__ui--hidden">
<div class="pswp__top-bar">
<!-- Controls are self-explanatory. Order can be changed. -->
<div class="pswp__counter"></div>
<button class="pswp__button pswp__button--close" title="Close (Esc)"></button>
<button class="pswp__button pswp__button--share" style="display:none" title="Share"></button>
<button class="pswp__button pswp__button--fs" title="Toggle fullscreen"></button>
<button class="pswp__button pswp__button--zoom" title="Zoom in/out"></button>
<!-- Preloader demo http://codepen.io/dimsemenov/pen/yyBWoR -->
<!-- element will get class pswp__preloader--active when preloader is running -->
<div class="pswp__preloader">
<div class="pswp__preloader__icn">
<div class="pswp__preloader__cut">
<div class="pswp__preloader__donut"></div>
</div>
</div>
</div>
</div>
<div class="pswp__share-modal pswp__share-modal--hidden pswp__single-tap">
<div class="pswp__share-tooltip"></div>
</div>
<button class="pswp__button pswp__button--arrow--left" title="Previous (arrow left)">
</button>
<button class="pswp__button pswp__button--arrow--right" title="Next (arrow right)">
</button>
<div class="pswp__caption">
<div class="pswp__caption__center"></div>
</div>
</div>
</div>
</div>
</div>
</body>
</html>
<a href="https://github.com/Robbie-Han"><img width="149" height="149" src="https://github.blog/wp-content/uploads/2008/12/forkme_left_red_aa0000.png?resize=149%2C149" class="attachment-full size-full" alt="Fork me on GitHub" data-recalc-dims="1"></a>