cdn图片访问demo

<h3>图1</h3> <p><img src="https://www.showdoc.com.cn/server/api/attachment/visitFile?sign=52d5783a04f9caa8f358e49759f8e85b&amp;file=file.jpg" alt="" /></p> <h3>图2</h3> <p><img src="https://www.showdoc.com.cn/server/api/attachment/visitFile?sign=add6a3c9ae6b3385301224d6ec47c382&amp;file=file.jpg" alt="" /></p> <h3>图3</h3> <p><img src="https://www.showdoc.com.cn/server/api/attachment/visitFile?sign=3c9b95dc82d89baf2dd29007ee381d8f&amp;file=file.jpg" alt="" /></p> <h3>图4</h3> <p><img src="https://www.showdoc.com.cn/server/api/attachment/visitFile?sign=3f3639b6f92dd5c0a9539deff8438bd3&amp;file=file.jpg" alt="" /></p>