uTools-Manuals/docs/jQuery/load-event.html

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<h1 class="entry-title">.load()</h1>
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						所属分类：<span class="category"><a href="/category/events/">事件</a> &gt; <a href="/category/events/document-loading/">文档加载</a></span><span class="category-divider"> | </span><span class="category"><a href="/category/deprecated/">弃用</a> &gt; <a href="/category/deprecated/deprecated-1.8/">1.8 版本弃用的 API</a></span><span class="category-divider"> | </span><span class="category"><a href="/category/removed/">已删除的函数</a></span>
<span class="pull-right">英文文档：<a href="https://api.jquery123.com/load-event/" target="_blank">.load()</a></span>
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<span class="name">.load( handler(eventObject) )</span><span class="returns">返回: <a href="/Types/#jQuery">jQuery</a></span><span class="version-details">version deprecated: <a href="/category/version/1.8/">1.8</a></span>
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<p class="desc"><strong>描述: </strong>为 JavaScript 的 "load" 事件绑定一个处理函数。</p>
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<span class="version-details">添加的版本: <a href="/category/version/1.0/">1.0</a></span>.load( handler(eventObject) )</h4>
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<div><strong>handler(eventObject)</strong></div>
<div>类型: <a href="/Types/#Function">Function</a>()</div>
<div>每次事件触发时会执行的函数。</div>
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<span class="version-details">添加的版本: <a href="/category/version/1.4.3/">1.4.3</a></span>.load(  [eventData ], handler(eventObject) )</h4>
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<div><strong>eventData</strong></div>
<div>类型: <a href="/Types/#PlainObject">PlainObject</a>
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<div>一个对象，它包含的数据键值对映射将被传递给事件处理程序。</div>
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<div><strong>handler(eventObject)</strong></div>
<div>类型: <a href="/Types/#Function">Function</a>()</div>
<div>每次事件触发时会执行的函数。</div>
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<p>这个方法是 <code>.bind('load', handler)</code> 的快捷方式。</p>
<p>当所有子元素已经被完全加载完成时，<code>load</code>事件被发送到这个元素。此事件适用于任何可使用 URL关联的任何元素：images, scripts, frames, iframes,  <code>window</code> 对象。</p>
<p>例子,考虑了一个简单的图片页面：</p>
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<pre><div class="container"><div class="line"><code><span class="tag">&lt;<span class="title">img</span> <span class="attribute">src</span>=<span class="value">"book.png"</span> <span class="attribute">alt</span>=<span class="value">"Book"</span> <span class="attribute">id</span>=<span class="value">"book"</span> /&gt;</span></code></div></div></pre>
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<p>事件处理器可以绑定到图像上：</p>
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<pre><div class="container"><div class="line"><code>$(<span class="string">'#book'</span>).load(<span class="keyword">function</span>() {</code></div></div><div class="container"><div class="line"><code>  <span class="comment">// Handler for .load() called.</span></code></div></div><div class="container"><div class="line"><code>});</code></div></div></pre>
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<p>只要图像已被加载，该处理程序被调用。</p>
<p>在一般情况下，没有必要等待所有图像完全装入。如果代码可以更早的执行，通常最好把它在发送到<code>.ready()</code>方法处理。</p>
<div class="warning"><p>Ajax的模块也有一个方法命名<a href="/load"><code>.load()</code></a> 。jQuery根据传递给它的参数设置来确定使用哪个方法执行。</p></div>
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<b>当使用图像上的<code>load</code>事件时的注意事项</b>
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<p>开发者们在试图使用 <code>.load()</code> 事件来解决一个共通的挑战，那就是：当一张图片（或一组图片）被完全加载完之后，执行一个函数。以下是一些相关的注意事项：</p>
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<li>它在跨浏览器下始终是不可靠</li>
<li>如果被设置图片的src和之前的src相同，在WebKit中，该事件不能正常触发</li>
<li>不能正常的在DOM树上冒泡</li>
<li>如果图片已经在浏览器的缓存中，将停止触发</li>
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<p><strong>注意：</strong><code>.live()</code>和<code>.delegate()</code>方法不能用于检测一个iframe的<code>load</code>事件。load事件不能正常泡沫到父文档,并且在Firefox,IE9和Chrome浏览器中，event.target无法被设置，因为它需要事件代理。</p>
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<section class="entry-examples" id="entry-examples"><header><h2 class="underline">例子:</h2></header><div class="entry-example" id="example-0">
<h4>Example: <span class="desc">当页面（包括所有图片）被完全加载完后，执行一个函数。</span>
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<pre><div class="container"><div class="line"><code>$(window).load(<span class="function"><span class="keyword">function</span> <span class="params">()</span> {</span></code></div></div><div class="container"><div class="line"><code>  <span class="comment">// run code</span></code></div></div><div class="container"><div class="line"><code>});</code></div></div></pre>
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<h4>Example: <span class="desc">在图片对象的 load 事件中，做如下处理：如果图片高度大于 100，就给它添加 bigImg 样式。</span>
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<pre><div class="container"><div class="line"><code>$(<span class="string">'img.userIcon'</span>).load(<span class="keyword">function</span>(){</code></div></div><div class="container"><div class="line"><code>  <span class="keyword">if</span>($(<span class="keyword">this</span>).height() &gt; <span class="number">100</span>) {</code></div></div><div class="container"><div class="line"><code>    $(<span class="keyword">this</span>).addClass(<span class="string">'bigImg'</span>);</code></div></div><div class="container"><div class="line"><code>  }</code></div></div><div class="container"><div class="line"><code>});</code></div></div></pre>
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