js保存网页图片不显示图片

function saveImage(url, callback) {
    let img = new Image();
    img.crossOrigin = "Anonymous"; // 解决跨域问题
    img.onload = function() {
        let canvas = document.createElement('canvas');
        let ctx = canvas.getContext('2d');
        canvas.width = img.width;
        canvas.height = img.height;
        ctx.drawImage(img, 0, 0);
        canvas.toBlob(function(blob) {
            let link = document.createElement('a');
            link.href = URL.createObjectURL(blob);
            link.download = 'image.jpg';
            link.click();
            URL.revokeObjectURL(link.href); // 释放内存
            if (callback) callback();
        });
    };
    img.src = url;
}

// 使用示例
saveImage('https://example.com/image.jpg', function() {
    console.log('图片已保存');
});

img.crossOrigin = "Anonymous";