CSS实现图片按比例缩放

.image {
    max-width:600px;
    height:auto;
    cursor:pointer;
    //border:1px dashed #4E6973;
    //padding: 3px;
    zoom:expression( function(elm) {
        if (elm.width>360) {
            var oldVW = elm.width;
            elm.width=360;
            elm.height = elm.height*(360 /oldVW);
        }
        elm.style.zoom = '1';
    }(this)
    );
}


/*<img src="url" class="image" />*/