js限制图片显示的大小

//缩放图片到合适大小
        function ResizeImages() {
            var myimg, oldwidth, oldheight;
            var maxwidth = 400;
            var maxheight = 400
            var imgs = document.getElementById('article').getElementsByTagName('img');   //如果你定义的id不是article，请修改此处

            for (i = 0; i < imgs.length; i++) {
                myimg = imgs[i];

                if (myimg.width > myimg.height) {
                    if (myimg.width > maxwidth) {
                        oldwidth = myimg.width;
                        myimg.height = myimg.height * (maxwidth / oldwidth);
                        myimg.width = maxwidth;
                    }
                } else {
                    if (myimg.height > maxheight) {
                        oldheight = myimg.height;
                        myimg.width = myimg.width * (maxheight / oldheight);
                        myimg.height = maxheight;
                    }
                }
            }
        }
        //缩放图片到合适大小
        ResizeImages();
    </script>