From 33058f2b292b3a581333bdfb21b8f671898c5060 Mon Sep 17 00:00:00 2001
From: Peter Bengtsson <mail@peterbe.com>
Date: Tue, 8 Dec 2020 14:40:17 -0500
Subject: initial commit

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+---
+title: CanvasRenderingContext2D.lineWidth
+slug: Web/API/CanvasRenderingContext2D/lineWidth
+tags:
+  - API
+  - Canvas
+translation_of: Web/API/CanvasRenderingContext2D/lineWidth
+---
+<div>{{APIRef}}</div>
+
+<p>The <code><strong>CanvasRenderingContext2D</strong></code><strong><code>.lineWidth</code></strong> 是 Canvas 2D API 设置线段厚度的属性（即线段的宽度）。</p>
+
+<div class="blockIndicator note">
+<p><strong>Note：</strong>线可以通过{{domxref("CanvasRenderingContext2D.stroke()", "stroke()")}}, {{domxref("CanvasRenderingContext2D.strokeRect()", "strokeRect()")}}, 和{{domxref("CanvasRenderingContext2D.strokeText()", "strokeText()")}} 方法绘制。</p>
+</div>
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox"><var><em>ctx</em>.lineWidth = value;</var></pre>
+
+<h3 id="选项">选项</h3>
+
+<dl>
+ <dt><code>value</code></dt>
+ <dd>描述线段宽度的数字。 0、 负数、 {{jsxref("Infinity")}} 和 {{jsxref("NaN")}} 会被忽略。</dd>
+</dl>
+
+<h2 id="示例">示例</h2>
+
+<h3 id="改变线宽">改变线宽</h3>
+
+<p>此示例使用15个单位的线宽绘制直线和矩形。</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">const canvas = document.getElementById('canvas');
+const ctx = canvas.getContext('2d');
+
+ctx.lineWidth = 15;
+
+ctx.beginPath();
+ctx.moveTo(20, 20);
+ctx.lineTo(130, 130);
+ctx.rect(40, 40, 70, 70);
+ctx.stroke();
+</pre>
+
+<h4 id="结果">结果</h4>
+
+<p>{{ EmbedLiveSample('改变线宽', 700, 180) }}</p>
+
+<h3 id="更多示例">更多示例</h3>
+
+<p>有关此属性的更多示例和说明，请参阅在“画布教程”中的<a href="/zh-CN/docs/Web/API/Canvas_API/Tutorial/Applying_styles_and_colors">使用样式和颜色</a>。</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-linewidth", "CanvasRenderingContext2D.lineWidth")}}</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>{{Compat("api.CanvasRenderingContext2D.lineWidth")}}</p>
+
+<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，实现了一个不标准的并且不赞成使用的方法 <code>ctx.setLineWidth()</code> 。</li>
+</ul>
+
+<h3 id="Gecko-specific_注解">Gecko-specific 注解</h3>
+
+<ul>
+ <li>从 Gecko 2.0 {{geckoRelease("2.0")}}版本开始， 设置<code>lineWidth</code> 为负数不再抛出异常，所有非正数值都会被忽略。</li>
+</ul>
+
+<h2 id="参见">参见</h2>
+
+<ul>
+ <li>接口定义， {{domxref("CanvasRenderingContext2D")}}</li>
+ <li>{{domxref("CanvasRenderingContext2D.lineCap")}}</li>
+ <li>{{domxref("CanvasRenderingContext2D.lineJoin")}}</li>
+ <li><a href="/zh-CN/docs/Web/API/Canvas_API/Tutorial/Applying_styles_and_colors">使用样式和颜色</a></li>
+</ul>
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