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

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<h1 class="entry-title">event.preventDefault()</h1>
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						所属分类：<span class="category"><a href="/category/events/">事件</a> &gt; <a href="/category/events/event-object/">事件对象</a></span>
<span class="pull-right">英文文档：<a href="https://api.jquery123.com/event.preventDefault/" target="_blank">event.preventDefault()</a></span>
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<span class="name">event.preventDefault()</span><span class="returns">返回: <a href="/Types/#undefined">undefined</a></span>
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<p class="desc"><strong>描述: </strong>如果调用这个方法，默认事件行为将不再触发。</p>
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<span class="version-details">添加的版本: <a href="/category/version/1.0/">1.0</a></span>event.preventDefault()</h4>
<ul><li><div class="null-signature">这个方法不接受任何参数。</div></li></ul>
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<p>例如，在执行这个方法后，如果点击一个链接（a标签），浏览器不会跳转到新的 URL 去了。我们可以用 <code>event.isDefaultPrevented()</code> 来确定这个方法是否(在那个事件对象上)被调用过了。</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><span class="desc">取消点击动作的默认导航行为。</span></h4>
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<pre><div class="container"><div class="line"><code><span class="doctype">&lt;!DOCTYPE html&gt;</span></code></div></div><div class="container"><div class="line"><code><span class="tag">&lt;<span class="title">html</span>&gt;</span></code></div></div><div class="container"><div class="line"><code><span class="tag">&lt;<span class="title">head</span>&gt;</span></code></div></div><div class="container"><div class="line"><code>  <span class="tag">&lt;<span class="title">script</span> <span class="attribute">src</span>=<span class="value">"https://code.jquery.com/jquery-latest.js"</span>&gt;</span><span class="javascript"></span><span class="tag">&lt;/<span class="title">script</span>&gt;</span></code></div></div><div class="container"><div class="line"><code><span class="tag">&lt;/<span class="title">head</span>&gt;</span></code></div></div><div class="container"><div class="line"><code><span class="tag">&lt;<span class="title">body</span>&gt;</span></code></div></div><div class="container"><div class="line"><code> </code></div></div><div class="container"><div class="line"><code><span class="tag">&lt;<span class="title">a</span> <span class="attribute">href</span>=<span class="value">"http://jquery.com"</span>&gt;</span>default click action is prevented<span class="tag">&lt;/<span class="title">a</span>&gt;</span></code></div></div><div class="container"><div class="line"><code><span class="tag">&lt;<span class="title">div</span> <span class="attribute">id</span>=<span class="value">"log"</span>&gt;</span><span class="tag">&lt;/<span class="title">div</span>&gt;</span></code></div></div><div class="container"><div class="line"><code> </code></div></div><div class="container"><div class="line"><code><span class="tag">&lt;<span class="title">script</span>&gt;</span><span class="javascript"></span></code></div></div><div class="container"><div class="line"><code>$(<span class="string">"a"</span>).click(<span class="keyword">function</span>(event) {</code></div></div><div class="container"><div class="line"><code>  event.preventDefault();</code></div></div><div class="container"><div class="line"><code>  $(<span class="string">'&lt;div/&gt;'</span>)</code></div></div><div class="container"><div class="line"><code>    .append(<span class="string">'default '</span> + event.type + <span class="string">' prevented'</span>)</code></div></div><div class="container"><div class="line"><code>    .appendTo(<span class="string">'#log'</span>);</code></div></div><div class="container"><div class="line"><code>});</code></div></div><div class="container"><div class="line"><code><span class="tag">&lt;/<span class="title">script</span>&gt;</span></code></div></div><div class="container"><div class="line"><code> </code></div></div><div class="container"><div class="line"><code><span class="tag">&lt;/<span class="title">body</span>&gt;</span></code></div></div><div class="container"><div class="line"><code><span class="tag">&lt;/<span class="title">html</span>&gt;</span></code></div></div></pre>
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<h4>Demo:</h4>
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