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+---
+title: CanvasRenderingContext2D.getLineDash()
+slug: Web/API/CanvasRenderingContext2D/getLineDash
+tags:
+  - Canvas
+  - CanvasRenderingContext2D
+translation_of: Web/API/CanvasRenderingContext2D/getLineDash
+---
+<div>{{APIRef}}</div>
+
+<p><code><strong>CanvasRenderingContext2D</strong></code><strong><code>.getLineDash()</code></strong> 是 Canvas 2D API 获取当前线段样式的方法。</p>
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox"><var><em>ctx</em>.getLineDash();</var>
+</pre>
+
+<h3 id="返回值">返回值</h3>
+
+<p>一个 {{jsxref("Array")}}数组。一组描述交替绘制线段和间距（坐标空间单位）长度的数字。如果数组元素的数量是奇数，数组元素会被复制并重复。 例如， 设置线段为 <code>[5, 15, 25]</code> 将会得到以下返回值 <code>[5, 15, 25, 5, 15, 25]。</code></p>
+
+<h2 id="示例">示例</h2>
+
+<h3 id="使用_getLineDash_方法">使用 <code>getLineDash</code> 方法</h3>
+
+<p>这是一段使用 <code>getLineDash</code> 方法的简单的代码片段。</p>
+
+<h4 id="HTML">HTML</h4>
+
+<pre class="brush: html">&lt;canvas id="canvas"&gt;&lt;/canvas&gt;
+</pre>
+
+<h4 id="JavaScript">JavaScript</h4>
+
+<pre class="brush: js; highlight:[5]">var canvas = document.getElementById("canvas");
+var ctx = canvas.getContext("2d");
+
+ctx.setLineDash([5, 15]);
+console.log(ctx.getLineDash()); // [5, 15]
+
+ctx.beginPath();
+ctx.moveTo(0,100);
+ctx.lineTo(400, 100);
+ctx.stroke();
+</pre>
+
+<p>修改下面的代码并在线查看 canvas 的变化：</p>
+
+<div style="display: none;">
+<h6 id="Playable_code">Playable code</h6>
+
+<pre class="brush: html">&lt;canvas id="canvas" width="400" height="200" class="playable-canvas"&gt;&lt;/canvas&gt;
+&lt;div class="playable-buttons"&gt;
+  &lt;input id="edit" type="button" value="Edit" /&gt;
+  &lt;input id="reset" type="button" value="Reset" /&gt;
+&lt;/div&gt;
+&lt;textarea id="code" class="playable-code"&gt;
+ctx.setLineDash([5, 15]);
+ctx.beginPath();
+ctx.moveTo(0,100);
+ctx.lineTo(400, 100);
+ctx.stroke();&lt;/textarea&gt;
+</pre>
+
+<pre class="brush: js">var canvas = document.getElementById("canvas");
+var ctx = canvas.getContext("2d");
+var textarea = document.getElementById("code");
+var reset = document.getElementById("reset");
+var edit = document.getElementById("edit");
+var code = textarea.value;
+
+function drawCanvas() {
+  ctx.clearRect(0, 0, canvas.width, canvas.height);
+  eval(textarea.value);
+}
+
+reset.addEventListener("click", function() {
+  textarea.value = code;
+  drawCanvas();
+});
+
+edit.addEventListener("click", function() {
+  textarea.focus();
+})
+
+textarea.addEventListener("input", drawCanvas);
+window.addEventListener("load", drawCanvas);
+</pre>
+</div>
+
+<p>{{ EmbedLiveSample('Playable_code', 700, 360) }}</p>
+
+<h2 id="规范描述">规范描述</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('HTML WHATWG', "scripting.html#dom-context-2d-getlinedash", "CanvasRenderingContext2D.getLineDash")}}</td>
+   <td>{{Spec2('HTML WHATWG')}}</td>
+   <td></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。 如果您想提供数据，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.CanvasRenderingContext2D.getLineDash")}}</p>
+
+<h2 id="参见">参见</h2>
+
+<ul>
+ <li>接口定义， {{domxref("CanvasRenderingContext2D")}}</li>
+ <li>{{domxref("CanvasRenderingContext2D.setLineDash()")}}</li>
+ <li>{{domxref("CanvasRenderingContext2D.lineDashOffset")}}</li>
+</ul>