Merge branch 'main' into fix-typo-client-side-web-apis-intro-ja

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+---
+title: EventSource.onopen
+slug: Web/API/EventSource/open_event
+tags:
+  - API
+  - Event Handler
+  - EventSource
+translation_of: Web/API/EventSource/onopen
+original_slug: Web/API/EventSource/onopen
+---
+<div>{{APIRef('WebSockets API')}}</div>
+
+<p>{{domxref("EventSource")}}接口的 <code><strong>onopen</strong></code> 属性是一个 {{event("Event_handlers", "event handler")}} ，它在收到{{event("open")}} 事件时被调用，在那时，连接刚被打开。</p>
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox">eventSource.onopen = function</pre>
+
+<h2 id="示例">示例</h2>
+
+<pre class="brush: js">evtSource.onopen = function() {
+  console.log("Connection to server opened.");
+};</pre>
+
+<div class="note">
+<p><strong>注意</strong> ：你可以在 GitHub 上看到一个完整的示例— 请看 <a href="https://github.com/mdn/dom-examples/tree/master/server-sent-events">使用php的SSE(服务器发送事件)demo。</a></p>
+</div>
+
+<h2 id="规范">规范</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', "comms.html#handler-eventsource-onopen", "onopen")}}</td>
+   <td>{{Spec2('HTML WHATWG')}}</td>
+   <td>Initial definition</td>
+  </tr>
+ </tbody>
+</table>
+
+<ul>
+</ul>
+
+<h2 id="浏览器兼容性">浏览器兼容性</h2>
+
+{{Compat("api.EventSource.onopen")}}
+
+<h2 id="相关链接">相关链接</h2>
+
+<ul>
+ <li>{{domxref("EventSource")}}</li>
+</ul>