Question

我有一个非常简单的承诺，它执行，我得到返回响应，并在处理返回响应时，它就像函数永不退出一样。我的测试变得越来越简单，只是把它归结为基础知识，然而问题仍然存在 - 不能为我的生活看到它为什么会这样做。

isError = 0 ;
// validating corporate ID
if ($scope.installType == 1) {
  $scope.errMsg = "Validating Corporate Business ID" ;
  document.getElementById('errorMsg').style.textDecoration = 'blink' ;

  return apiService.all()
  .then(function(response){
    var corpData = response[0] ;
    if (corpData.rowCount == 1 && corpData.data[0].corpID == $scope.userObj.corp_ID) {
      // theoretically a match was found
      console.log("no error") ;
    } else {
      // no match was found
      console.log("with error") ;
      isError++ ;
    }
    console.log("isError: "+isError) ;  // this prints to console
    //return ;  // had added this thinking it was stuck inside the promise, still didn't work
  }) ;
  console.log("hereA") ;  // <-- never gets here
}

Answer 1

该日志不会执行，因为它位于return语句之后。

isError = 0 ;
// validating corporate ID
if ($scope.installType == 1) {
  $scope.errMsg = "Validating Corporate Business ID" ;
  document.getElementById('errorMsg').style.textDecoration = 'blink' ;

  return apiService.all() // <= watch this return statement
      .then(function(response){
        var corpData = response[0] ;
          if (corpData.rowCount == 1 && corpData.data[0].corpID == $scope.userObj.corp_ID) {
          // theoretically a match was found
           console.log("no error") ;
        } else {
           // no match was found
          console.log("with error") ;
          isError++ ;
        }
        console.log("isError: "+isError) ;  // this prints to console
        //return ;  // had added this thinking it was stuck inside the promise, still didn't work
      }) ;
  console.log("hereA") ;  // <-- Code after a return never executes
}

将它放在return之前的任何其他位置，它将按预期执行。我已经重新缩进了你的代码并对其进行了评论，希望它更容易理解。

为避免将来遇到这种麻烦，请考虑安装类似Eslint的内容并将其集成到IDE /编辑器中。 Its no-unreachable rule会直接警告你所遇到的问题。

编辑：

if ($scope.installType == 1) {
  $scope.errMsg = "Validating Corporate Business ID" ;
  document.getElementById('errorMsg').style.textDecoration = 'blink' ;

   apiService.all() // <= removed return statement
      .then(function(response){
        var corpData = response[0] ;
          if (corpData.rowCount == 1 && corpData.data[0].corpID == $scope.userObj.corp_ID) {
          // theoretically a match was found
           console.log("no error") ;
        } else {
           // no match was found
          console.log("with error") ;
          isError++ ;
        }
        console.log("isError: "+isError) ;  // this prints to console
        //return ;  // had added this thinking it was stuck inside the promise, still didn't work
      }) ;
  console.log("hereA") ;  // <-- this executes
}

Answer 2

IT永远不会在那里，因为控制台日志不在您构建的功能链之内，而是在返回后发生。

AngluarJS承诺不会干净利落地退出

2 个答案: