說(shuō)明：

從API version 7開始支持。后續(xù)版本如有新增內(nèi)容，則采用上角標(biāo)單獨(dú)標(biāo)記該內(nèi)容的起始版本。

使用OffscreenCanvasRenderingContext2D在offscreen canvas上進(jìn)行繪制，繪制對(duì)象可以是矩形、文本、圖片等

屬性：

示例代碼：
Hml代碼：

Css代碼：

.container {
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 100%;
    height: 100%;
}

Js代碼：

export default {
    onShow(){
        var ctx = this.$refs.canvasId.getContext('2d');
        var offscreen = new OffscreenCanvas(360, 500);
        var offCanvas2 = offscreen.getContext("2d");
        var img = new Image();
        img.src = 'common/images/bg-tv.jpg';
        offCanvas2.drawImage(img, 0, 0, 100, 100);
        offCanvas2.filter = 'blur(5px)';
        offCanvas2.drawImage(img, 100, 0, 100, 100);

        offCanvas2.filter = 'grayscale(50%)';
        offCanvas2.drawImage(img, 200, 0, 100, 100);

        offCanvas2.filter = 'hue-rotate(90deg)';
        offCanvas2.drawImage(img, 0, 100, 100, 100);

        offCanvas2.filter = 'invert(100%)';
        offCanvas2.drawImage(img, 100, 100, 100, 100);

        offCanvas2.filter = 'drop-shadow(8px 8px 10px green)';
        offCanvas2.drawImage(img, 200, 100, 100, 100);

        offCanvas2.filter = 'brightness(0.4)';
        offCanvas2.drawImage(img, 0, 200, 100, 100);

        offCanvas2.filter = 'opacity(25%)';
        offCanvas2.drawImage(img, 100, 200, 100, 100);

        offCanvas2.filter = 'saturate(30%)';
        offCanvas2.drawImage(img, 200, 200, 100, 100);

        offCanvas2.filter = 'sepia(60%)';
        offCanvas2.drawImage(img, 0, 300, 100, 100);

        offCanvas2.filter = 'contrast(200%)';
        offCanvas2.drawImage(img, 100, 300, 100, 100);
        var bitmap = offscreen.transferToImageBitmap();
        ctx.transferFromImageBitmap(bitmap);
    }
}