Javascript 已在处理程序中创建承诺,但未从中返回

Javascript 已在处理程序中创建承诺,但未从中返回,javascript,promise,bluebird,Javascript,Promise,Bluebird,我刚刚开始使用“蓝鸟承诺”,但我遇到了一个令人困惑的错误 代码摘要 var jQueryPostJSON = function jQueryPostJSON(url, data) { return Promise.resolve( jQuery.ajax({ contentType: "application/json; charset=utf-8", dataType: "json", type: "POST",

我刚刚开始使用“蓝鸟承诺”,但我遇到了一个令人困惑的错误

代码摘要

var
  jQueryPostJSON = function jQueryPostJSON(url, data) {

    return Promise.resolve(
      jQuery.ajax({
        contentType: "application/json; charset=utf-8",
        dataType: "json",
        type: "POST",
        url: url,
        data: JSON.stringify(data)
      })
    ).then(function(responseData) {
      console.log("jQueryPostJSON response " + JSON.stringify(responseData, null, 2));
      return responseData;
    });
  },
  completeTask = function completeTask(task, variables) {
    console.log("completeTask called for taskId: "+task.id);
    //FIXME reform variables according to REST API docs
    var variables = {
      "action" : "complete",
      "variables" : []
    };
    spin.start();
    return jQueryPostJSON(hostUrl + 'service/runtime/tasks/'+task.id, variables)
      .then(function() {
        gwl.grrr({
          msg: "Completed Task. Definition Key: " + task.taskDefinitionKey,
          type: "success",
          displaySec: 3
        });
        spin.stop();
        return null;
      });
  }
jQueryPostJSON函数在其他地方使用时似乎可以正常工作,但在这种情况下,会从服务器返回数据

当它在complete task中使用时,POST是成功的,这在服务器端可以看到,但是then函数从未在控制台中调用,我得到了错误

completeTask called for taskId: 102552
bundle.js:20945 spin target: [object HTMLDivElement]
bundle.js:20968 spinner started
bundle.js:1403 Warning: a promise was created in a  handler but was not returned from it
    at jQueryPostJSON (http://localhost:9000/dist/bundle.js:20648:22)
    at Object.completeTask (http://localhost:9000/dist/bundle.js:20743:14)
    at http://localhost:9000/dist/bundle.js:21051:15
From previous event:
    at HTMLDocument.<anonymous> (http://localhost:9000/dist/bundle.js:21050:10)
    at HTMLDocument.handleObj.handler (http://localhost:9000/dist/bundle.js:5892:30)
    at HTMLDocument.jQuery.event.dispatch (http://localhost:9000/dist/bundle.js:10341:9)
    at HTMLDocument.elemData.handle (http://localhost:9000/dist/bundle.js:10027:28)
bundle.js:1403 Unhandled rejection (<{"readyState":4,"responseText":"","sta...>, no stack trace)
第一个函数调用api.getCurrentProcessInstanceTask()的输出似乎表明它工作正常,但这里仍然是

getCurrentProcessInstanceTask = function getCurrentProcessInstanceTask() {

      if (!currentProcess || !currentProcess.id) {
        return Promise.reject(new Error("no currentProcess is set, cannot get active task"));
      }

      var processInstanceId = currentProcess.id;

      return Promise.resolve(jQuery.get(hostUrl + "service/runtime/tasks", {
          processInstanceId: processInstanceId
        }))
        .then(function(data) {
          console.log("response: " + JSON.stringify(data, null, 2));
          currentProcess.tasks = data.data;
          // if(data.data.length > 1){
          //   throw new Error("getCurrentProcessInstanceTask expects single task result. Result listed "+data.data.length+" tasks!");
          // }
          console.log("returning task id: "+data.data[0].id);
          return data.data[0];
        });
    },

您收到警告是因为正如上面所说,您没有从
然后的
处理程序返回承诺。
拒绝来自何处最好通过捕获并记录来跟踪。如果没有堆栈跟踪,则表明您(或您使用的某个lib)正在
抛出一个非
错误的普通对象。试着找到并修复它

您的呼叫应如下所示:

api.getCurrentProcessInstanceTask().then(function(task) {
    return api.completeTask(task);
//  ^^^^^^
}).catch(function(err) {
// ^^^^^
    console.error(err);
});

你有一个未处理的拒绝和一个警告。请告诉我们什么是
对象。completeTask
以及在第21050行附近可以找到什么。
api.getCurrentProcessInstanceTask().then(function(task) {
    return api.completeTask(task);
//  ^^^^^^
}).catch(function(err) {
// ^^^^^
    console.error(err);
});