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diff --git a/files/zh-cn/web/api/window/load_event/index.html b/files/zh-cn/web/api/window/load_event/index.html new file mode 100644 index 0000000000..7f784a47f1 --- /dev/null +++ b/files/zh-cn/web/api/window/load_event/index.html @@ -0,0 +1,162 @@ +--- +title: load +slug: Web/API/Window/load_event +tags: + - load +translation_of: Web/API/Window/load_event +original_slug: Web/Events/load +--- +<p>{{APIRef}}</p> + +<p>当整个页面及所有依赖资源如样式表和图片都已完成加载时，将触发<code>load</code>事件。</p> + +<p>它与{{domxref("Document/DOMContentLoaded_event", "DOMContentLoaded")}}不同，后者只要页面DOM加载完成就触发，无需等待依赖资源的加载。</p> + +<table class="properties"> + <tbody> + <tr> + <th scope="row">是否冒泡</th> + <td>否</td> + </tr> + <tr> + <th scope="row">能否取消</th> + <td>否</td> + </tr> + <tr> + <th scope="row">接口</th> + <td>{{domxref("Event")}}</td> + </tr> + <tr> + <th scope="row">Event handler property</th> + <td>{{domxref("GlobalEventHandlers/onload", "onload")}}</td> + </tr> + </tbody> +</table> + +<h2 id="用法">用法</h2> + +<p>当页面及资源完全加载后在控制台打印一段信息：</p> + +<pre class="brush: js notranslate">window.addEventListener('load', (event) => { + console.log('page is fully loaded'); +});</pre> + +<p>也可以使用<code>onload</code>实现：</p> + +<pre class="brush: js notranslate">window.onload = (event) => { + console.log('page is fully loaded'); +};</pre> + +<h2 id="示例">示例</h2> + +<h3 id="HTML">HTML</h3> + +<pre class="brush: html notranslate"><div class="controls"> + <button id="reload" type="button">Reload</button> +</div> + +<div class="event-log"> + <label>Event log:</label> + <textarea readonly class="event-log-contents" rows="8" cols="30"></textarea> +</div></pre> + +<div class="hidden"> +<h3 id="CSS">CSS</h3> + +<pre class="brush: css notranslate">body { + display: grid; + grid-template-areas: "control log"; +} + +.controls { + grid-area: control; + display: flex; + align-items: center; + justify-content: center; +} + +.event-log { + grid-area: log; +} + +.event-log-contents { + resize: none; +} + +label, button { + display: block; +} + +#reload { + height: 2rem; +} +</pre> +</div> + +<h3 id="JS">JS</h3> + +<pre class="brush: js notranslate">const log = document.querySelector('.event-log-contents'); +const reload = document.querySelector('#reload'); + +reload.addEventListener('click', () => { + log.textContent =''; + window.setTimeout(() => { + window.location.reload(true); + }, 200); +}); + +window.addEventListener('load', (event) => { + log.textContent = log.textContent + 'load\n'; +}); + +document.addEventListener('readystatechange', (event) => { + log.textContent = log.textContent + `readystate: ${document.readyState}\n`; +}); + +document.addEventListener('DOMContentLoaded', (event) => { + log.textContent = log.textContent + `DOMContentLoaded\n`; +}); + +</pre> + +<h4 id="结果">结果</h4> + +<p>{{ EmbedLiveSample('Live_example', '100%', '160px') }}</p> + +<h2 id="规范">规范</h2> + +<table class="standard-table"> + <thead> + <tr> + <th scope="col">Specification</th> + <th scope="col">Status</th> + <th scope="col">Comment</th> + </tr> + </thead> + <tbody> + <tr> + <td>{{SpecName('UI Events', '#event-type-load', 'load')}}</td> + <td>{{Spec2('UI Events')}}</td> + <td></td> + </tr> + <tr> + <td>{{SpecName('HTML WHATWG', '#delay-the-load-event', 'load event')}}</td> + <td>{{Spec2('HTML WHATWG')}}</td> + <td>此链接指向加载文档结束时执行步骤中的部分。“load”事件也会在许多元素上触发。 请注意，规范中有很多地方涉及到可以"<a href="https://html.spec.whatwg.org/multipage/parsing.html#delay-the-load-event">延迟加载事件</a>"的内容。</td> + </tr> + </tbody> +</table> + +<h2 id="浏览器兼容性">浏览器兼容性</h2> + +<div class="hidden"> +<p>此页面上的兼容性表是根据结构化数据生成的。 如果您想贡献数据，请查看 <a href="https://github.com/mdn/browser-compat-data">https://github.com/mdn/browser-compat-data</a> 并向我们发送请求请求。</p> +</div> + +<p>{{Compat("api.Window.load_event")}}</p> + +<h2 id="参阅">参阅</h2> + +<ul> + <li>相关事件: {{domxref("Window/DOMContentLoaded_event", "DOMContentLoaded")}}, {{domxref("Document/readystatechange_event", "readystatechange")}}, {{domxref("Window/beforeunload_event", "beforeunload")}}, {{domxref("Window/unload_event", "unload")}}</li> +</ul> |