Question

我正在开发一个开源EmberJS项目，它正在发出Ajax请求信息，然后需要根据响应的动态子部分来解决。

  return new Promise((resolve, reject) => {
    const { resourceName, identificationAttributeName } = this.getProperties('resourceName', 'identificationAttributeName');
    const data         = {};
    data[resourceName] = { password };
    data[resourceName][identificationAttributeName] = identification;

    return this.makeRequest(data).then(
      (response) => run(null, resolve, response),
      (xhr) => run(null, reject, xhr.responseJSON || xhr.responseText)
    );
  });

...

makeRequest(data, options) {
  const serverTokenEndpoint = this.get('serverTokenEndpoint');
  const requestOptions = $.extend({}, {
    url:      serverTokenEndpoint,
    type:     'POST',
    dataType: 'json',
    data,
    beforeSend(xhr, settings) {
      xhr.setRequestHeader('Accept', settings.accepts.json);
    }
  }, options || {});

  return $.ajax(requestOptions);
}

最后，我需要成功响应来运行类似

的内容

(response) => run(null, resolve, response[resourceName])

但在响应函数内部，我无法访问resourceName。我该如何发送？

这是转换后的代码：

  var _this = this;

  return new Promise(function (resolve, reject) {
    var _getProperties2 = _this.getProperties('resourceName', 'identificationAttributeName');

    var resourceName = _getProperties2.resourceName;
    var identificationAttributeName = _getProperties2.identificationAttributeName;

    var data = {};
    data[resourceName] = { password: password };
    data[resourceName][identificationAttributeName] = identification;

    return _this.makeRequest(data).then(function (response) {
      run(null, resolve, response);
    }, function (xhr) {
      return run(null, reject, xhr.responseJSON || xhr.responseText);
    });

Answer 1

但在回复功能中，我无法访问resourceName。

当然你这样做 - 试试吧！箭头函数create closures也是如此。

不过，你应该avoid the Promise constructor antipattern（而不是让run返回一些东西），你应该dodge jQuery deferreds支持真正的承诺。

Javascript：将变量传递给Promise

1 个答案: