//图片自适应大小
var info_flag = false;
function AXImg(ximg,maxwidth,maxheight) {
    var image = new Image();
    var iwidth = maxwidth; //图片宽度
    var iheight = maxheight; //图片高度
    image.src = ximg.src;
    if (image.width > 0 && image.height > 0) {
        info_flag = true;
        if (image.width / image.height >= iwidth / iheight) {
            if (image.width > iwidth) {
                ximg.width = iwidth;
                ximg.height = (image.height * iwidth) / image.width;
            } else {
                ximg.width = image.width;
                ximg.height = image.height;
            }
            //ximg.alt = image.width + "×" + image.height;
        } else {
            if (image.height > iheight) {
                ximg.height = iheight;
                ximg.width = (image.width * iheight) / image.height;
            } else {
                ximg.width = image.width;
                ximg.height = image.height;
            }
            //ximg.alt = image.width + "×" + image.height;
        }
    }
}