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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: CanvasRenderingContext2D.stroke()
+slug: Web/API/CanvasRenderingContext2D/stroke
+translation_of: Web/API/CanvasRenderingContext2D/stroke
+---
+<div>{{APIRef}}</div>
+
+<p><code><strong>CanvasRenderingContext2D</strong></code><strong><code>.stroke()</code></strong> 是 Canvas 2D API 使用非零环绕规则,根据当前的画线样式,绘制当前或已经存在的路径的方法。</p>
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox">void <var><em>ctx</em>.stroke();</var>
+void <var><em>ctx</em>.stroke(path);</var>
+</pre>
+
+<h3 id="Parameters">Parameters</h3>
+
+<dl>
+ <dt><code>path</code></dt>
+ <dd>绘制的路径{{domxref("Path2D")}} 。</dd>
+</dl>
+
+<h2 id="示例">示例</h2>
+
+<h3 id="使用_stroke_方法">使用 <code>stroke</code> 方法</h3>
+
+<p>这是一段简单的代码片段,使用 <code>stroke</code> 方法绘制一条路径。</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:[4]">var canvas = document.getElementById("canvas");
+var ctx = canvas.getContext("2d");
+ctx.rect(10, 10, 100, 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.rect(10, 10, 100, 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-stroke", "CanvasRenderingContext2D.stroke")}}</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>
+
+<p>{{ CompatibilityTable() }}</p>
+
+<div id="compat-desktop">
+<table class="compat-table">
+ <tbody>
+ <tr>
+ <th>Feature</th>
+ <th>Chrome</th>
+ <th>Firefox (Gecko)</th>
+ <th>Internet Explorer</th>
+ <th>Opera</th>
+ <th>Safari</th>
+ </tr>
+ <tr>
+ <td>Basic support</td>
+ <td>{{ CompatVersionUnknown() }}</td>
+ <td>{{ CompatVersionUnknown() }}</td>
+ <td>{{ CompatVersionUnknown() }}</td>
+ <td>{{ CompatVersionUnknown() }}</td>
+ <td>{{ CompatVersionUnknown() }}</td>
+ </tr>
+ <tr>
+ <td>Path parameter</td>
+ <td>{{ CompatVersionUnknown() }}</td>
+ <td>{{ CompatGeckoDesktop(31) }}</td>
+ <td>{{ CompatNo }}</td>
+ <td>{{ CompatVersionUnknown() }}</td>
+ <td>{{ CompatNo }}</td>
+ </tr>
+ </tbody>
+</table>
+</div>
+
+<div id="compat-mobile">
+<table class="compat-table">
+ <tbody>
+ <tr>
+ <th>Feature</th>
+ <th>Android</th>
+ <th>Chrome for Android</th>
+ <th>Firefox Mobile (Gecko)</th>
+ <th>IE Mobile</th>
+ <th>Opera Mobile</th>
+ <th>Safari Mobile</th>
+ </tr>
+ <tr>
+ <td>Basic support</td>
+ <td>{{ CompatVersionUnknown() }}</td>
+ <td>{{ CompatVersionUnknown() }}</td>
+ <td>{{ CompatVersionUnknown() }}</td>
+ <td>{{ CompatVersionUnknown() }}</td>
+ <td>{{ CompatVersionUnknown() }}</td>
+ <td>{{ CompatVersionUnknown() }}</td>
+ </tr>
+ <tr>
+ <td>Path parameter</td>
+ <td>{{ CompatUnknown() }}</td>
+ <td>{{ CompatUnknown() }}</td>
+ <td>{{ CompatGeckoMobile(31) }}</td>
+ <td>{{ CompatUnknown() }}</td>
+ <td>{{ CompatUnknown() }}</td>
+ <td>{{ CompatUnknown() }}</td>
+ </tr>
+ </tbody>
+</table>
+</div>
+
+<h2 id="参见">参见</h2>
+
+<ul>
+ <li>接口定义, {{domxref("CanvasRenderingContext2D")}}.</li>
+</ul>