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+---
+title: CanvasRenderingContext2D.strokeStyle
+slug: Web/API/CanvasRenderingContext2D/strokeStyle
+tags:
+  - Canvas
+  - CanvasRenderingContext2D
+translation_of: Web/API/CanvasRenderingContext2D/strokeStyle
+---
+<div>{{APIRef}}</div>
+
+<p><code><strong>CanvasRenderingContext2D</strong></code><strong><code>.strokeStyle</code></strong> 是 Canvas 2D API 描述画笔（绘制图形）颜色或者样式的属性。默认值是 <code>#000</code> (black)。</p>
+
+<p>参见 <a href="/en-US/docs/Web/API/Canvas_API/Tutorial">Canvas Tutorial</a> 中的 <a href="/en-US/docs/Web/API/Canvas_API/Tutorial/Applying_styles_and_colors">Applying styles and color</a> 章节。</p>
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox"><var><em>ctx</em>.strokeStyle = color;
+</var><var><em>ctx</em>.strokeStyle = gradient;
+</var><var><em>ctx</em>.strokeStyle = pattern;</var>
+</pre>
+
+<h3 id="选项">选项</h3>
+
+<dl>
+ <dt><code>color</code></dt>
+ <dd>{{domxref("DOMString")}} 字符串，可以转换成 CSS {{cssxref("&lt;color&gt;")}} 值。</dd>
+ <dt><code>gradient</code></dt>
+ <dd>{{domxref("CanvasGradient")}} 对象（线性渐变或放射性渐变）。</dd>
+ <dt><code>pattern</code></dt>
+ <dd>{{domxref("CanvasPattern")}} 对象（可重复的图片）。</dd>
+</dl>
+
+<h2 id="示例">示例</h2>
+
+<h3 id="Using_the_strokeStyle_property" name="Using_the_strokeStyle_property">使用 <code>strokeStyle</code> 属性设置不同的颜色</h3>
+
+<p>这是一段简单的代码片段，使用 <code>strokeStyle</code> 属性设置不同的颜色。</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">var canvas = document.getElementById("canvas");
+var ctx = canvas.getContext("2d");
+
+ctx.strokeStyle = "blue";
+ctx.strokeRect(10, 10, 100, 100);
+</pre>
+
+<p>修改下面的代码并在线查看 canvas 的变化：</p>
+
+<div class="hidden">
+<h6 id="Playable_code" name="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.strokeStyle = "blue";
+ctx.strokeRect(10, 10, 100, 100);&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>
+
+<h3 id="A_strokeStyle_example" name="A_strokeStyle_example"><code>strokeStyle</code> 例子</h3>
+
+<p>这个例子使用 <code>strokeStyle 属性改变图形轮廓线的颜色。</code>我们使用 {{domxref("CanvasRenderingContext2D.arc", "arc()")}} 绘制圆形来代替正方形。</p>
+
+<pre class="brush: js">var ctx = document.getElementById('canvas').getContext('2d');
+for (var i=0;i&lt;6;i++){
+  for (var j=0;j&lt;6;j++){
+    ctx.strokeStyle = 'rgb(0,' + Math.floor(255-42.5*i) + ',' +
+                      Math.floor(255-42.5*j) + ')';
+    ctx.beginPath();
+    ctx.arc(12.5+j*25,12.5+i*25,10,0,Math.PI*2,true);
+    ctx.stroke();
+  }
+}
+</pre>
+
+<div class="hidden">
+<pre class="brush: html">&lt;canvas id="canvas" width="150" height="150"&gt;&lt;/canvas&gt;</pre>
+</div>
+
+<p>结果如下显示：</p>
+
+<p>{{EmbedLiveSample("A_strokeStyle_example", "180", "180", "https://mdn.mozillademos.org/files/253/Canvas_strokestyle.png")}}</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-strokestyle", "CanvasRenderingContext2D.strokeStyle")}}</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.strokeStyle")}}</p>
+
+<div id="compat-mobile"></div>
+
+<h3 id="WebKitBlink-specific_注解">WebKit/Blink-specific 注解</h3>
+
+<ul>
+ <li>在基于 WebKit- 和 Blink- 的浏览器中，除了此属性外，还实现了一个不标准的并且不赞成使用的方法  <code>ctx.setStrokeColor()</code> 。
+
+  <pre class="brush: js">setStrokeColor(color, optional alpha);
+setStrokeColor(grayLevel, optional alpha);
+setStrokeColor(r, g, b, a);
+setStrokeColor(c, m, y, k, a);
+</pre>
+ </li>
+</ul>
+
+<h2 id="参见">参见</h2>
+
+<ul>
+ <li>接口定义， {{domxref("CanvasRenderingContext2D")}}</li>
+ <li>{{domxref("CanvasGradient")}}</li>
+ <li>{{domxref("CanvasPattern")}}</li>
+</ul>