var str ="name=geyao&age=18&sex=nv"

var queryString=require("querystring")

var obj = queryString.parse(str)

console.log(obj)

var myobj=queryString.stringify({
    name:"geyao",
    address:"suzhou",
    age:18,
    love:"hahh"
})
console.log(myobj)

运行结果