javascript - Angular : Adding variable into a chain of promises

Question

我正在学习 promises 并且正在努力解决以下问题。

本例中运行了三个函数。

//returns an search query in JSON format
filterSearch() 

  // searches Parse.com and returns an array of values
  .then(performSearch)

  // I am passing the array of values to exerciseSearch and a another value (term - string)
  .then(function(result) {
     exerciseSearch(result, term);
     })

  // The results from the search is displayed in scope. 
  .then(function(exercises) {
     $scope.allExercises = exercises;

  }, function(error) {
     console.log('error');
});

Answer 1

Promise 链应该总是有来自 .then 的返回对象来继续 promise 链

//returns an search query in JSON format
filterSearch() 

  // searches Parse.com and returns an array of values
  .then(performSearch)

  //(term - string)
  .then(function(result) {
       return exerciseSearch(result, term); //exerciseSearch should return exercises from fn
     })

  // The results from the search is displayed in scope. 
  .then(function(exercises) {
     $scope.allExercises = exercises;
     return exercises;
  }, function(error) {
     console.log('error');
});