js签名算法中按对象键值升序排列方法

var raw = function (args) {
  var keys = Object.keys(args);
  keys = keys.sort()
  var newArgs = {};
  keys.forEach(function (key) {
    newArgs[key.toLowerCase()] = args[key];
  });

  var string = '';
  for (var k in newArgs) {
    string += '&' + k + '=' + newArgs[k];
  }
  string = string.substr(1);
  return string;
};

var createNonceStr = function () {
  return Math.random().toString(36).substr(2, 15);
};

var createTimestamp = function () {
  return parseInt(new Date().getTime() / 1000) + '';
};