//定义元祖
//第一种
let a = ("why",1.88,18)
//第二种
let b = (name : "why",height : 1.88,age : 18)
//第三种
let (name,height,age) = ("why",1.88,18)
//取出元组中的值
//第一种
let error = (404,"Not Found")
error.0
error.1
//第二种
let error1 = (error1Code : 404,error1Info : "Not Found")
error1.error1Code
error1.error1Info
//第三种
let (error2Code,error2Info) = (404,"Not Found")
error2Code
error2Info