Promise chaining with success和reject函数

Question

给出一小段如下代码：

let p = somePromise
p.then(
    function (response) {
        $scope.resultDetails = response.data;
        return theNextPromise;
    },
    function (error) {
        $scope.resultDetails = error.data;
        return theNextPromise;
    }
).then((result) => { ...do more stuff here });

如果你想要在解决或拒绝的时候返回一个承诺，那么你要做什么才能从这里返回一个承诺来启动一个链，这看起来像是你最终会重复代码。真的是这样吗?或者你可以做些什么来使这个过程更干净一些

Answer 1

这个怎么样？初始化promise对象并保持链接，直到您想要最终确定promise。

let sequence = Promise.resolve()

sequence = sequence.then(() => {
  return p
});

sequence = sequence.then((response) => {
    $scope.resultDetails = response.data;
    return theNextPromise;
  },
(error) => {
    $scope.resultDetails = error.data;
    return theNextPromise;
  }));

sequence = sequence.then(result => {return promise object})

// finalize
sequence.then(do something)