编码：encodeURIComponent

encodeURIComponent：
let s = "sxw9114"
//编码  
let s2 = encodeURIComponent(s)

解码：decodeURIComponent

let s = "9114"
//编码
let s2 = encodeURIComponent(s)
//解码
let s3 = decodeURIComponent(s2)