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+---
+title: CanvasRenderingContext2D.shadowOffsetY
+slug: Web/API/CanvasRenderingContext2D/shadowOffsetY
+translation_of: Web/API/CanvasRenderingContext2D/shadowOffsetY
+---
+<div>{{APIRef}}</div>
+
+<p><code><strong>CanvasRenderingContext2D</strong></code><strong><code>.shadowOffsetY</code></strong> 是 Canvas 2D API 描述阴影垂直偏移距离的属性。</p>
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox"><var><em>ctx</em>.shadowOffsetY = offset;</var>
+</pre>
+
+<dl>
+ <dt><code>offset</code></dt>
+ <dd>阴影垂直偏移距离的float类型的值。 默认值是 0。  {{jsxref("Infinity")}} 或者{{jsxref("NaN")}} 都会被忽略。</dd>
+</dl>
+
+<h2 id="示例">示例</h2>
+
+<h3 id="Using_the_shadowOffsetY_property" name="Using_the_shadowOffsetY_property">使用 <code>shadowOffsetY</code> 属性</h3>
+
+<p>这是一段简单的代码片段，使用 <code>shadowOffsetY</code> 属性绘制阴影垂直偏移量。注意：将shadowColor属性设置成不透明，阴影才会被绘制。</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.shadowColor = "black";
+ctx.shadowOffsetY = 10;
+ctx.shadowBlur = 10;
+
+ctx.fillStyle = "green";
+ctx.fillRect(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.shadowColor = "black";
+ctx.shadowOffsetY = 10;
+ctx.shadowBlur = 10;
+ctx.fillStyle = "green";
+ctx.fillRect(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>
+
+<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-shadowoffsety", "CanvasRenderingContext2D.shadowOffsetY")}}</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>
+ </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>
+ </tbody>
+</table>
+</div>
+
+<h2 id="参见">参见</h2>
+
+<ul>
+ <li>接口定义，{{domxref("CanvasRenderingContext2D")}}.</li>
+ <li>{{domxref("CanvasRenderingContext2D.shadowOffsetX")}}</li>
+ <li>{{domxref("CanvasRenderingContext2D.shadowColor")}}</li>
+ <li>{{domxref("CanvasRenderingContext2D.shadowBlur")}}</li>
+</ul>