# 发送少量数据
curl -X POST -H "Content-Type: application/json" -d '{"user":"admin","password":"12345"}' http://192.168.1.1/login
# 大量数据建议从文件读取
curl -X POST -H "Content-Type: application/json" -d @./login.json http://192.168.1.1/login

curl -X POST -H "Content-Type: application/json" -d '{"user":"$1","password":"$2"}' http://192.168.1.1/login
# 发送的内容是{"user":"$1","password":"$2"}

# q是quote的缩写，当然随便什么名字都可以
q='"'
curl -X POST -H "Content-Type: application/json" -d "{${q}user${q}:${q}$1${q},${q}password${q}:${q}$2${q}}" http://192.168.1.1/login
# 发送的内容是{"user":"admin","password":"12345"}