yaml数据格式

person:
    name: zhangsan

person: {name: zhangsan}

address:
    - beijing
    - shanghai
address: [beijing, shanghai]

msg1: 'hello \n world' # 不会识别转义字符，会原样输出
msg2: "hello \n word"  # 会识别转义字符

name: lisi
person:
    name: ${name} #引用上边定义的name值