js页面截屏添加水印

function addWatermark() {
    const canvas = document.createElement('canvas');
    const ctx = canvas.getContext('2d');
    const img = new Image();
    img.src = 'path_to_your_image.jpg'; // 替换为实际图片路径

    img.onload = function() {
        canvas.width = img.width;
        canvas.height = img.height;
        ctx.drawImage(img, 0, 0);

        // 添加水印
        ctx.font = '20px Arial';
        ctx.fillStyle = 'rgba(255, 255, 255, 0.5)';
        ctx.fillText('Your Watermark Text', 10, 30);

        // 将canvas转换为图片
        const watermarkedImage = canvas.toDataURL('image/png');
        document.body.appendChild(new Image().src = watermarkedImage);
    };
}

// 调用函数
addWatermark();