Yaml syntax introduction and various data types

1. Introduce

1. YAML Grammar introduction

YAML Is a similar to XML、JSON The Markedness of language . It emphasizes “ data ” Centered , It doesn't focus on markup language

YAML The syntax of is mainly as follows ：

• Case sensitive
• Use indentation to indicate hierarchy
• Indent using spaces , As far as possible need not tab
• The number of indented spaces doesn't matter , Just align the elements at the same level to the left
• : Add a space after it
• # Notation
• Multisegment yaml Put the configuration in a file , Use in the middle --- Separate

have access to yaml to json Website Test and verify

2. YAML data type

2.1 Constant ： A single 、 Values that cannot be split anymore

• Boolean type

key: true
key: True

• integer

key: 123

• Floating point type

key: 3.14

• null type

key: ~

• The date type

key: 2022-05-13

• Time type

key: 2022-05-13T15:02:31+08.00

• String type

key: haha    #  If there is a special symbol in the middle of the string , Wrap with double or single quotation marks 

#  Write one line into multiple lines , Wrap in quotation marks , Add... At the end \
key: "part1\
	  part2"

2.2 object ： Set of key value pairs

#  Form 1 ( recommend )
person:	
  name: zhang_san
  age: 18
  
#  Form 2 
person: {name: zhang_san, age: 18}

2.3 Array ： A set of values in order

#  Form 1 ( recommend )
address:
  -  Beijing 
  -  Shanghai 

#  Form 2 
address: [ Beijing ,  Shanghai ]