function loadJs(url, _callback_success, _callback_fail) {
  var callback_success = function(response) {
    console.log('load js success...', response)
  }
  var callback_fail = function(response) {
    console.log('load js fail...', response)
  }
  _callback_success = _callback_success || callback_success
  _callback_fail = _callback_fail || callback_fail
  $.getScript(url).done(_callback_success).fail(_callback_fail)
}

var API = (function() {
  function API() {}
  // 加载js的函数
  API.prototype.loadJs = function(url, callback) {
    callback = callback || {}
    loadJs(url, callback.success, callback.fail)
  }

  return API
})()

export default API