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+---
+title: CanvasRenderingContext2D.font
+slug: Web/API/CanvasRenderingContext2D/font
+tags:
+ - API
+ - Canvas
+ - CanvasRenderingContext2D
+translation_of: Web/API/CanvasRenderingContext2D/font
+---
+<div>{{APIRef}}</div>
+
+<p><code><strong>CanvasRenderingContext2D</strong></code><strong><code>.font</code></strong> 是 Canvas 2D API 描述绘制文字时,当前字体样式的属性。 使用和 <a href="/en-US/docs/Web/CSS/font" title="en/CSS/font">CSS font</a> 规范相同的字符串值。</p>
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox"><var><em>ctx</em>.font = value;</var>
+</pre>
+
+<h3 id="选项">选项</h3>
+
+<dl>
+ <dt><code>value</code></dt>
+ <dd>符合CSS {{cssxref("font")}} 语法的{{domxref("DOMString")}} 字符串。默认字体是 10px sans-serif。</dd>
+</dl>
+
+<h2 id="示例">示例</h2>
+
+<h3 id="使用自定义字体" name="使用自定义字体">使用自定义字体</h3>
+
+<p>这个例子使用 <code>font</code> 属性设置了不同的字体大小和字体种类。</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.font = "bold 48px serif";
+ctx.strokeText("Hello world", 50, 100);
+</pre>
+
+<h4 id="结果">结果</h4>
+
+<div class="hidden">
+<h2 id="Playable_code">Playable_code</h2>
+
+<h3 id="HTML_2">HTML</h3>
+
+<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="编辑" /&gt;
+  &lt;input id="reset" type="button" value="重置" /&gt;
+&lt;/div&gt;
+&lt;textarea id="code" class="playable-code"&gt;
+ctx.font = "bold 48px serif";
+ctx.strokeText("Hello world", 50, 100);&lt;/textarea&gt;
+</pre>
+
+<h3 id="JavaScript_2">JavaScript</h3>
+
+<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="sect1"></h2>
+
+<h3 id="使用CSS字体加载API加载字体">使用CSS字体加载API加载字体</h3>
+
+<p>借助{{domxref("FontFace")}} API的帮助,您可以在画布中使用字体之前显式加载字体。</p>
+
+<pre>let f = new FontFace('test', 'url(x)');
+
+f.load().then(function() {
+ // Ready to use the font in a canvas context
+});</pre>
+
+<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-font", "CanvasRenderingContext2D.font")}}</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.font")}}</p>
+
+<h3 id="Gecko-specific_注解">Gecko-specific 注解</h3>
+
+<ul>
+ <li>基于Gecko的浏览器, 例如 Firefox, 实现了一个非标准的并且不赞成使用的属性 <code>ctx.mozTextStyle</code> 。不要使用此属性。</li>
+ <li>在Gecko中,当将系统字体设置为canvas 2D上下文的{{domxref("CanvasRenderingContext2D.font", "font")}}(例如菜单)的值时,获取用于无法返回期望字体的字体值 (不返回任何内容)。 这已在Firefox 57({{bug(1374885)}})中发布的Firefox的<a href="https://wiki.mozilla.org/Quantum/Stylo">Quantum/Stylo</a>并行CSS引擎中修复。</li>
+</ul>
+
+<h2 id="参见">参见</h2>
+
+<ul>
+ <li>接口定义,{{domxref("CanvasRenderingContext2D")}}</li>
+</ul>