Commonly used functions of markdown

Generally, you can use the following directory
==
# Function description
## Function 1
* Function 1.1
* Function 1.1.1
* Function 1.1.1.1
* Function 1.1.1.2
* Function 1.1.2
* Function 1.2
* Function 1.3
## Function 2
* Feature 2.1
> 11
> ssssss
## [connection](www.baidu.com)
`with background color`,`afdasdfasdfa`