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Canvas clearRect() 方法

❮ Canvas 参考资料

示例

在画布上清除矩形

您的浏览器不支持 HTML5 canvas 标签。

JavaScript

const canvas = document.getElementById("myCanvas");
const ctx = canvas.getContext("2d");

ctx.fillStyle = "red";
ctx.fillRect(20, 20, 200, 100);
ctx.clearRect(40, 40, 50, 50);
亲自试一试 »

描述

clearRect() 方法清除画布上的指定像素。

clearRect() 方法不会更改当前路径。

已清除的区域设置为透明 rgba(0,0,0,0)。

注意

clearRect() 后绘制之前,始终调用 beginPath()

另请参阅

fillStyle 属性(设置填充颜色或图案)

fillRect() 方法(绘制填充矩形)

strokeRect() 方法(绘制矩形)

rect() 方法(将矩形添加到路径)


语法

context.clearRect(x, y, width, height)

参数值

参数 描述 播放它
x 矩形左上角的 x 坐标 播放它 »
y 矩形左上角的 y 坐标 播放它 »
width 要清除的矩形的宽度(以像素为单位) 播放它 »
height 要清除的矩形的高度(以像素为单位) 播放它 »

返回值


浏览器支持

<canvas> 元素是 HTML5 标准 (2014)。

clearRect() 在所有现代浏览器中都受支持

Chrome Edge Firefox Safari Opera IE
9-11

❮ Canvas 参考资料
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