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<h2 id="前言"><a href="#前言" class="headerlink" title="前言"></a><strong>前言</strong></h2><blockquote>
<p><strong>今天闲来无事，发现有这个调用摄像头的todo，网上查了一下，果然 js 有调用摄像头的 api，为此自己写一个 demo ，避免忘记。</strong></p>
</blockquote>
<h2 id="正文"><a href="#正文" class="headerlink" title="正文"></a>正文</h2><p><br></p>
<h3 id="调用摄像头"><a href="#调用摄像头" class="headerlink" title="调用摄像头"></a>调用摄像头</h3><p><strong>一共有两种实现方式，一种是使用<code>navigator.getUserMedia</code>（该特性已经从 Web 标准中删除，虽然一些浏览器目前仍然支持它，但也许会在未来的某个时间停止支持，请尽量不要使用该特性），前面一种已经从 Web 标准中删除，仅为了向后兼容而存在，第二种是使用<code>navigator.mediaDevices.getUserMedia</code>(推荐使用),这两种方法 Safari 貌似都不支持。。。。</strong></p>
<p>第二种<code>navigator.mediaDevices.getUserMedia</code>实现方法:<br><figure class="highlight javascript"><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><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br></pre></td><td class="code"><pre><span class="line"><!doctype html></span><br><span class="line"><html lang=<span class="string">"en"</span>></span><br><span class="line"><head></span><br><span class="line"> <meta charset=<span class="string">"UTF-8"</span>></span><br><span class="line"> <title>拍照<span class="number">2</span><<span class="regexp">/title></span></span><br><span class="line"><span class="regexp"></</span>head></span><br><span class="line"><body></span><br><span class="line"> <button id=<span class="string">"take"</span>>拍照<<span class="regexp">/button></span></span><br><span class="line"><span class="regexp"> <br /</span>></span><br><span class="line"> <video id=<span class="string">"v"</span> style=<span class="string">"width: 640px;height: 480px;"</span>></video></span><br><span class="line"> <canvas id=<span class="string">"canvas"</span> style=<span class="string">"display:none;"</span>></canvas></span><br><span class="line"> <br /></span><br><span class="line"> <img src=<span class="string">"http://placehold.it/640&text=Your%20image%20here%20..."</span> id=<span class="string">"photo"</span> alt=<span class="string">"photo"</span>></span><br><span class="line"> <script></span><br><span class="line"> !(<span class="function"><span class="keyword">function</span> (<span class="params"></span>) </span>{</span><br><span class="line"> <span class="comment">// 老的浏览器可能根本没有实现 mediaDevices，所以我们可以先设置一个空的对象</span></span><br><span class="line"> <span class="keyword">if</span> (navigator.mediaDevices === <span class="literal">undefined</span>) {</span><br><span class="line"> navigator.mediaDevices = {};</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">if</span> (navigator.mediaDevices.getUserMedia === <span class="literal">undefined</span>) {</span><br><span class="line"> navigator.mediaDevices.getUserMedia = <span class="function"><span class="keyword">function</span> (<span class="params">constraints</span>) </span>{</span><br><span class="line"> <span class="comment">// 首先，如果有getUserMedia的话，就获得它</span></span><br><span class="line"> <span class="keyword">var</span> getUserMedia = navigator.webkitGetUserMedia || navigator.mozGetUserMedia || navigator.msGetUserMedia;</span><br><span class="line"> <span class="comment">// 一些浏览器根本没实现它 - 那么就返回一个error到promise的reject来保持一个统一的接口</span></span><br><span class="line"> <span class="keyword">if</span> (!getUserMedia) {</span><br><span class="line"> <span class="keyword">return</span> <span class="built_in">Promise</span>.reject(<span class="keyword">new</span> <span class="built_in">Error</span>(<span class="string">'getUserMedia is not implemented in this browser'</span>));</span><br><span class="line"> }</span><br><span class="line"> <span class="comment">// 否则，为老的navigator.getUserMedia方法包裹一个Promise</span></span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">new</span> <span class="built_in">Promise</span>(<span class="function"><span class="keyword">function</span> (<span class="params">resolve, reject</span>) </span>{</span><br><span class="line"> getUserMedia.call(navigator, constraints, resolve, reject);</span><br><span class="line"> });</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">const</span> constraints = {</span><br><span class="line"> video: <span class="literal">true</span>,</span><br><span class="line"> audio: <span class="literal">false</span></span><br><span class="line"> };</span><br><span class="line"> <span class="keyword">let</span> videoPlaying = <span class="literal">false</span>;</span><br><span class="line"> <span class="keyword">let</span> v = <span class="built_in">document</span>.getElementById(<span class="string">'v'</span>);</span><br><span class="line"> <span class="keyword">let</span> promise = navigator.mediaDevices.getUserMedia(constraints);</span><br><span class="line"> promise.then(<span class="function"><span class="params">stream</span> =></span> {</span><br><span class="line"> <span class="comment">// 旧的浏览器可能没有srcObject</span></span><br><span class="line"> <span class="keyword">if</span> (<span class="string">"srcObject"</span> <span class="keyword">in</span> v) {</span><br><span class="line"> v.srcObject = stream;</span><br><span class="line"> } <span class="keyword">else</span> {</span><br><span class="line"> <span class="comment">// 防止再新的浏览器里使用它，应为它已经不再支持了</span></span><br><span class="line"> v.src = <span class="built_in">window</span>.URL.createObjectURL(stream);</span><br><span class="line"> }</span><br><span class="line"> v.onloadedmetadata = <span class="function"><span class="keyword">function</span> (<span class="params">e</span>) </span>{</span><br><span class="line"> v.play();</span><br><span class="line"> videoPlaying = <span class="literal">true</span>;</span><br><span class="line"> };</span><br><span class="line"> }).catch(<span class="function"><span class="params">err</span> =></span> {</span><br><span class="line"> <span class="built_in">console</span>.error(err.name + <span class="string">": "</span> + err.message);</span><br><span class="line"> })</span><br><span class="line"> <span class="built_in">document</span>.getElementById(<span class="string">'take'</span>).addEventListener(<span class="string">'click'</span>, <span class="function"><span class="keyword">function</span> (<span class="params"></span>) </span>{</span><br><span class="line"> <span class="keyword">if</span> (videoPlaying) {</span><br><span class="line"> <span class="keyword">let</span> canvas = <span class="built_in">document</span>.getElementById(<span class="string">'canvas'</span>);</span><br><span class="line"> canvas.width = v.videoWidth;</span><br><span class="line"> canvas.height = v.videoHeight;</span><br><span class="line"> canvas.getContext(<span class="string">'2d'</span>).drawImage(v, <span class="number">0</span>, <span class="number">0</span>);</span><br><span class="line"> <span class="keyword">let</span> data = canvas.toDataURL(<span class="string">'image/webp'</span>);</span><br><span class="line"> <span class="built_in">document</span>.getElementById(<span class="string">'photo'</span>).setAttribute(<span class="string">'src'</span>, data);</span><br><span class="line"> }</span><br><span class="line"> }, <span class="literal">false</span>);</span><br><span class="line"> })();</span><br><span class="line"> <<span class="regexp">/script></span></span><br><span class="line"><span class="regexp"></</span>body></span><br><span class="line"><<span class="regexp">/html></span></span><br></pre></td></tr></table></figure></p>
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