CanvasRenderingContext2D:lineWidth 属性

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.

Canvas 2D API 的 CanvasRenderingContext2D.lineWidth 属性用于设置线宽。

备注: 线可以通过 stroke()strokeRect()strokeText() 方法绘制。

一个数字,指定线条的宽度(以坐标空间单位表示)。零、负数、InfinityNaN 值将被忽略。默认值为 1.0

示例

改变线宽

此示例使用 15 个单位的线宽绘制直线和矩形。

HTML

html
<canvas id="canvas"></canvas>

JavaScript

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();

结果

更多示例

有关此属性的更多示例和说明,请参阅 Canvas 教程中的应用样式和色彩

规范

Specification
HTML
# dom-context-2d-linewidth-dev

浏览器兼容性

Report problems with this compatibility data on GitHub
desktopmobile
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
lineWidth

Legend

Tip: you can click/tap on a cell for more information.

Full support
Full support

参见