适合区域内拖拽查看长途特效

代码说明：

  左下角有一个缩略图效果，拖拽缩略图的同时，大图对应比例的部分也会展示出来 效果相当不错 使用方法： 1、将css样式复制到你的网页中 2、将代码部分拷贝到body结束前即可 (图片、js采用绝对路径，不建议修改)(There is a thumbnail effect in the lower left corner. Drag and drop the thumbnail, and the proportions of the larger image are displayed. The result is pretty good. Usage method: 1, copy the CSS style to your webpage. 2. Copy the code part to the end of body. (photo, JS uses absolute path, no modification is recommended))