jquery: 计算图片大小，按比例缩放

function resizeImage(imgElement, maxWidth, maxHeight) {
    let ratio = 0;
    let width = imgElement.width();
    let height = imgElement.height();
    if (width > maxWidth) {
        ratio = maxWidth / width;
        imgElement.css({
            width: maxWidth,
            height: ratio * height
        });
    }
    if (height > maxHeight) {
        ratio = maxHeight / height;
        imgElement.css({
            width: ratio * width,
            height: maxHeight
        });
    }
}