update README.md.

README.md

@@ -41,11 +41,10 @@
 - 思维导图篇
 
  **部分截图展示**
+
 ![输入图片说明](https://images.gitee.com/uploads/images/2021/0707/214348_9e246618_9405140.png "WPS图片-修改尺寸2.png")
 ![输入图片说明](https://images.gitee.com/uploads/images/2021/0707/214358_0750c8dc_9405140.png "3.png")
-![输入图片说明](https://images.gitee.com/uploads/images/2021/0707/212516_5f83dc67_9405140.png "4.png")
-![输入图片说明](https://images.gitee.com/uploads/images/2021/0707/212600_873fd204_9405140.png "5.png")
-![输入图片说明](https://images.gitee.com/uploads/images/2021/0707/212607_c2f8a545_9405140.png "6.png")
+![输入图片说明](https://images.gitee.com/uploads/images/2021/0710/215212_dcc91cf0_9405140.png "QQ截图20210710214936.png")
 ![输入图片说明](https://images.gitee.com/uploads/images/2021/0707/212615_c4183d9d_9405140.png "7.png")
 
 由于篇幅限制，详解资料太全面，细节内容太多，所以只把部分知识点截图出来粗略的介绍，每个小节点里面都有更细化的内容！