var data = {
"tel":"18612341234",
"timestamp":"1514736000",
"channel":"SZQF",
"signmsg":"XXX",
}
var arr = []
for(var key in data){
arr.push(key)
}
var newArr = arr.sort(function(a,b){return a.localeCompare(b)})
var str = ""
for(var key of newArr){
str += key + "=" +data[key] + "&"
}
console.log(str.substr(0, str.length-1))