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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: TouchEvent.targetTouches
+slug: Web/API/TouchEvent/targetTouches
+translation_of: Web/API/TouchEvent/targetTouches
+---
+<p id="Summary">{{ APIRef("Touch Events") }}</p>
+
+<p><strong><code>targetTouches</code></strong> 是一个只读的 {{ domxref("TouchList") }} 列表,包含仍与触摸面接触的所有触摸点的 {{ domxref("Touch") }} 对象。{{event("touchstart")}}事件触发在哪个{{ domxref("element") }}内,它就是当前目标元素。</p>
+
+<h2 id="Syntax" name="Syntax">语法</h2>
+
+<pre class="brush: js">var <em>touches</em> = <em>touchEvent</em>.targetTouches;
+</pre>
+
+<h3 id="Return_Value" name="Return_Value">返回值</h3>
+
+<dl>
+ <dt><code>touches</code></dt>
+ <dd>一个 {{ domxref("TouchList") }},包含仍与触摸面接触的所有触摸点的 {{ domxref("Touch") }} 对象,{{event("touchstart")}}事件触发在哪个{{ domxref("element") }}内,它就是当前目标元素。</dd>
+</dl>
+
+<h2 id="Specification" name="Specification">例子</h2>
+
+<p>本例阐述了 {{domxref("TouchEvent")}} 对象的 {{domxref("TouchEvent.targetTouches")}} 属性。{{domxref("TouchEvent.targetTouches")}} 属性也是一个 {{domxref("TouchList")}},其中包含的触摸点起始于触摸事件当前的目标元素,并且此刻正在触摸屏幕。所以,<font face="consolas, Liberation Mono, courier, monospace"><span style="background-color: rgba(220, 220, 220, 0.5);">targetTouches</span></font> 元素是 <code>touches</code> 的真子集。</p>
+
+<p>下面代码段中的函数比较了 <code>touches</code> 列表和 <code>targetTouches</code> 列表的长度,返回值表示他们是否相等。</p>
+
+<pre class="brush: js">function touches_in_target(ev) {
+ // Return true if all of the touches are within the target element;
+ // otherwise return false.
+ return (ev.touches.length == ev.targetTouches.length ? true : false);
+}</pre>
+
+<h2 id="Specification" name="Specification">规格</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('Touch Events 2','#widl-TouchEvent-targetTouches')}}</td>
+ <td>{{Spec2('Touch Events 2')}}</td>
+ <td>Non-stable version.</td>
+ </tr>
+ <tr>
+ <td>{{SpecName('Touch Events','#widl-TouchEvent-targetTouches')}}</td>
+ <td>{{Spec2('Touch Events')}}</td>
+ <td>Initial definition.</td>
+ </tr>
+ </tbody>
+</table>
+
+
+
+<h2 id="浏览器兼容性">浏览器兼容性</h2>
+
+<p>{{Compat("api.TouchEvent.targetTouches")}}</p>