Cucumber 量角器尝试/捕获问题

我正在使用量角器和Cucumber，并注意到在某些情况下，我希望使用locator:By.cssSelector（“someCssLocatorHere”）捕获一个

NoSuchElementError:No元素。但是，除非调用.then（）函数的回调和errBack并抛出错误，以便以后可以像下面这样捕获它，否则使用传统的try/catch块将不起作用：

try{
  somePromise.then(function(){
  //callback function if promise gets resolved successfully
  }, function(e){
  console.log(e); //errBack in case promise gets rejected or fails
  throw e;   <--------------- THROW error here so can catch it in catch block below
  });
 }catch(e){
    console.log('error:'+e);
 }

try {   <---------------------------- Traditional TRY/CATCH method
  loadWebApp();
  login();
  openUserPreferences();
  changePassword();
 } catch (err) {
  console.error(
      "An error was thrown! " + err);
 }

 loadWebApp().
    then(login).
    then(openUserPreferences).
    then(changePassword).
    then(null, function(err) {  <----------------- PROTRACTOR equivalent of try/catch
      console.error(
          "An error was thrown! " + err);
    });

试试看{
somePromise.then（function（）{
//成功解析承诺时的回调函数
}，功能（e）{
console.log（e）；//在承诺被拒绝或失败时出错
抛出e；我最近遇到了这个问题，并注意到您不需要try/catch块。在量角器中，您可以实现try/catch，如下所示：

try{
  somePromise.then(function(){
  //callback function if promise gets resolved successfully
  }, function(e){
  console.log(e); //errBack in case promise gets rejected or fails
  throw e;   <--------------- THROW error here so can catch it in catch block below
  });
 }catch(e){
    console.log('error:'+e);
 }

try {   <---------------------------- Traditional TRY/CATCH method
  loadWebApp();
  login();
  openUserPreferences();
  changePassword();
 } catch (err) {
  console.error(
      "An error was thrown! " + err);
 }

 loadWebApp().
    then(login).
    then(openUserPreferences).
    then(changePassword).
    then(null, function(err) {  <----------------- PROTRACTOR equivalent of try/catch
      console.error(
          "An error was thrown! " + err);
    });

试试看{