javascript - Meteor - 我有错误，无法调试它

Question

我在 meteor 项目中有一个错误 - 就像这样:

TypeError: callbacks[i].call is not a function
    at template.js:116
    at Function.Template._withTemplateInstanceFunc (template.js:437)
    at fireCallbacks (template.js:112)
    at [object Object].<anonymous> (template.js:205)
    at view.js:104
    at Object.Blaze._withCurrentView (view.js:523)
    at view.js:103
    at Object.Tracker._runFlush (tracker.js:468)
    at onGlobalMessage (setimmediate.js:102)

你对此有什么想法吗？

补充:1) 在 template.js:116

var fireCallbacks = function (callbacks, template) {
  Template._withTemplateInstanceFunc(
    function () { return template; },
    function () {
      for (var i = 0, N = callbacks.length; i < N; i++) {
        callbacks[i].call(template);
      }
    });
};

Answer 1

我发现问题了!是因为:

Template.user_lesson.onRendered({});

应该是这样的:

Template.user_lesson.onRendered(function(){});

我没有在父模板中使用它，并且出现了错误。谢谢!