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authorPeter Bengtsson <mail@peterbe.com>2020-12-08 14:43:23 -0500
committerPeter Bengtsson <mail@peterbe.com>2020-12-08 14:43:23 -0500
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+---
+title: HTMLMediaElement.readyState
+slug: Web/API/HTMLMediaElement/readyState
+translation_of: Web/API/HTMLMediaElement/readyState
+---
+<div>{{APIRef("HTML DOM")}}</div>
+
+<div><strong><code>HTMLMediaElement.readyState</code> </strong>屬性回傳目前媒體的就緒狀態。</div>
+
+<h2 id="Syntax" name="Syntax">語法</h2>
+
+<pre class="syntaxbox">var readyState = audioOrVideo.readyState;</pre>
+
+<h3 id="值">值</h3>
+
+<p>一個 <code>unsigned short</code>,可能的值有:</p>
+
+<table class="standard-table">
+ <thead>
+ <tr>
+ <th scope="col">常數</th>
+ <th scope="col">值</th>
+ <th scope="col">描述</th>
+ </tr>
+ </thead>
+ <tbody>
+ <tr>
+ <td>HAVE_NOTHING</td>
+ <td>0</td>
+ <td>沒有可用的媒體資源。</td>
+ </tr>
+ <tr>
+ <td>HAVE_METADATA</td>
+ <td>1</td>
+ <td>已經取得足夠的媒體資源並已初始化元資料。繼續取得媒體資源不會導致例外。</td>
+ </tr>
+ <tr>
+ <td>HAVE_CURRENT_DATA</td>
+ <td>2</td>
+ <td>媒體資料已經足夠播放目前的時間,但沒有足夠的資料再播放一幀。</td>
+ </tr>
+ <tr>
+ <td>HAVE_FUTURE_DATA</td>
+ <td>3</td>
+ <td>資料已經足夠播放目前的時間,而且有至少一點點資料可以播放未來的時間(換句話說,可能只多了一到兩幀)。</td>
+ </tr>
+ <tr>
+ <td>HAVE_ENOUGH_DATA</td>
+ <td>4</td>
+ <td>資料足夠,且下載率夠高。媒體可以播放到結束而不被中斷。</td>
+ </tr>
+ </tbody>
+</table>
+
+<h2 id="範例">範例</h2>
+
+<p>下面這個例子會監聽 `example` 這個元素,並檢查是否已載入足夠的媒體資源。如果是的話,它會繼續播放。</p>
+
+<pre class="brush: html">&lt;audio id="example" preload="auto"&gt;
+ &lt;source src="sound.ogg" type="audio/ogg" /&gt;
+&lt;/audio&gt;
+
+</pre>
+
+<pre class="brush: js">var obj = document.getElementById('example');
+
+obj.addEventListener('loadeddata', function() {
+
+ if(obj.readyState &gt;= 2) {
+ obj.play();
+ }
+
+});
+</pre>
+
+<p> </p>
+
+<h2 id="標準">標準</h2>
+
+<table class="standard-table">
+ <tbody>
+ <tr>
+ <th scope="col">Specification</th>
+ <th scope="col">Status</th>
+ <th scope="col">Comment</th>
+ </tr>
+ <tr>
+ <td>{{SpecName('HTML WHATWG', "the-video-element.html#htmlmediaelement", "HTMLMediaElement.readyState")}}</td>
+ <td>{{Spec2('HTML WHATWG')}}</td>
+ <td>No change from {{SpecName('HTML5 W3C')}}</td>
+ </tr>
+ <tr>
+ <td>{{SpecName('HTML5 W3C', "embedded-content-0.html#htmlmediaelement", "HTMLMediaElement.readyState")}}</td>
+ <td>{{Spec2('HTML5 W3C')}}</td>
+ <td>Initial definition.</td>
+ </tr>
+ </tbody>
+</table>
+
+<h2 id="瀏覽器相容性">瀏覽器相容性</h2>
+
+
+
+<p>{{Compat("api.HTMLMediaElement.readyState")}}</p>
+
+<h2 id="See_Also" name="See_Also">也參考看看</h2>
+
+<ul>
+ <li>The interface defining it, {{domxref("HTMLMediaElement")}}.</li>
+</ul>