factory闭包

(function (root, factory) {
  if (typeof (define) === 'function' && define.amd) {
    // AMD
    define(factory);
  }
  else if (typeof (module) === 'object') {
    // CommonJS
    module.exports = factory();
  }
  else {
    // Script tag import i.e., IIFE
    root.utils = factory();
    root.u = factory();
  }
}(this, function () {
  'use strict';
  @import './utils/index.js'
  var utils = {};
  return utils;
}));