图片按比例缩放



img
            {
            width: 100%;
            height: 100%;
            max-width: 1500px;
            max-height: 1500px;
            scale: expression((this.offsetWidth > this.offsetHeight)?(this.style.width = this.offsetWidth >= 1500 ? "1500px" : "auto"):(this.style.height = this.offsetHeight >= 1500 ? "1500px" : "auto"));
            display: inline !important;
            }