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HTML <canvas> width 属性

❮ HTML <canvas> 标签

示例

一个高度和宽度为 200 像素的 <canvas> 元素

<canvas id="myCanvas" width="200" height="200" style="border:1px solid">
自己试试 »

下面有更多“自己试试”示例。


定义和用法

The width 属性指定 <canvas> 元素的宽度,以像素为单位。

提示:使用 height 属性指定 <canvas> 元素的高度,以像素为单位。

提示:每次重置画布的高度或宽度时,画布内容都会被清除(参见页面底部的示例)。

提示:在我们的 HTML 画布教程 中了解更多关于 <canvas> 元素的信息。


浏览器支持

表中的数字指定了完全支持该属性的第一个浏览器版本。

属性
width 4.0 9.0 2.0 3.1 9.0

语法

<canvas width="pixels">


属性值

描述
pixels 指定画布的宽度,以像素为单位(例如“100”)。默认值为 300

更多示例

示例

通过将 width 属性设置为 400px 来清除画布(使用 JavaScript)

<canvas id="myCanvas" width="200" height="200" style="border:1px solid"></canvas>

<script>
let c = document.getElementById("myCanvas");
let ctx = c.getContext("2d");
ctx.fillStyle = "#92B901";
ctx.fillRect(50, 50, 100, 100);

function clearCanvas() {
  c.width = 400;
}
</script>
自己试试 »

❮ HTML <canvas> 标签
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