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authorPeter Bengtsson <mail@peterbe.com>2020-12-08 14:40:17 -0500
committerPeter Bengtsson <mail@peterbe.com>2020-12-08 14:40:17 -0500
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+---
+title: GlobalEventHandlers.onload
+slug: Web/API/GlobalEventHandlers/onload
+tags:
+ - DOMContentLoaded
+ - ES6
+ - GlobalEventHandlers.onload
+ - load
+ - onload
+translation_of: Web/API/GlobalEventHandlers/onload
+---
+<p>{{ ApiRef() }}</p>
+
+<p>{{domxref("GlobalEventHandlers")}} mixin 的 <code>onload</code> 属性是一个事件处理程序用于处理{{domxref("Window")}}, {{domxref("XMLHttpRequest")}}, {{htmlelement("img")}} 等元素的加载事件,当资源已加载时被触发。</p>
+
+<h3 id="Syntax" name="Syntax">语法</h3>
+
+<pre class="eval">window.onload = <em>funcRef</em>;
+</pre>
+
+<ul>
+ <li> 当 window  <code style="font-style: normal;">load</code>  事件触发时,<span style="font-family: 'Courier New','Andale Mono',monospace;">funcRef</span> 方法会被调用。</li>
+</ul>
+
+<h3 id="Value">Value</h3>
+
+<p>funcRef 是窗口加载事件触发时调用的处理函数。</p>
+
+<h3 id="Example" name="Example">示例</h3>
+
+<pre class="brush: js">window.onload = function() {
+ init();
+ doSomethingElse();
+};
+</pre>
+
+<pre><code>&lt;!doctype html&gt;
+&lt;html&gt;
+ &lt;head&gt;
+ &lt;title&gt;onload test&lt;/title&gt;
+ // ES5
+ &lt;script&gt;
+ function load() {
+ console.log("load event detected!");
+ }
+ window.onload = load;
+ &lt;/script&gt;
+ // ES2015(aka: ES6)
+ &lt;script&gt;
+ const load = () =&gt; {
+ console.log("load event detected!");
+ }
+ window.onload = load;
+ &lt;/script&gt;
+ &lt;/head&gt;
+ &lt;body&gt;
+ &lt;p&gt;The load event fires when the document has finished loading!&lt;/p&gt;
+ &lt;/body&gt;
+&lt;/html&gt;</code></pre>
+
+<h3 id="Notes" name="Notes">注意</h3>
+
+<p>在文档装载完成后会触发  <code>load</code> 事件。此时,在文档中的所有对象都在DOM中,所有图片,脚本,链接以及子框都完成了装载。 </p>
+
+<p>同时也会有 <a href="/en/Gecko-Specific_DOM_Events">Gecko-指定 DOM事件</a>,如 <code>DOMContentLoaded</code> 和 <code>DOMFrameContentLoaded</code> (它们可以使用 {{ domxref("EventTarget.addEventListener()") }} 来处理 ) , 这些事件在页面DOM构建起来后就会触发,而不会等到其他的资源都装载完成。 </p>
+
+<h3 id="Specification" name="Specification">规范</h3>
+
+<p>这个事件处理程序在  <a class="external" href="http://www.whatwg.org/html/#handler-window-onload" title="http://www.whatwg.org/html/#handler-window-onload">HTML</a> 中指定。</p>
+
+<h3 id="参见">参见</h3>
+
+<ul>
+ <li><code><a href="https://developer.mozilla.org/en-US/docs/Web/Events/DOMContentLoaded">监听事件:简单的DOM事件</a>中的 DOMContentLoaded</code>  事件 </li>
+ <li><code>DOMContentLoaded</code> event in <a href="https://developer.mozilla.org/en-US/docs/Listening_to_events_in_Firefox_extensions#Simple_DOM_events">Listening to events: Simple DOM events</a></li>
+ <li>IIEF <a href="https://en.wikipedia.org/wiki/Immediately-invoked_function_expression" rel="nofollow noreferrer">Immediately-invoked function expression</a></li>
+ <li><a href="https://developer.mozilla.org/en-US/docs/Web/Events/DOMContentLoaded">DOMContentLoaded</a></li>
+ <li> </li>
+</ul>