javascript - 如何检索 AMD'ized Dojo 的 XHR 响应代码(+时间戳)？

Question

使用“旧”Dojo，可以将第二个参数ioargs 传递给Xhr 请求(see Example 6 here) 的load 函数。此 ioargs 提供(除其他外)请求的时间戳和状态代码。

但是我怎样才能使用新的“更干净”(并且向前兼容)的 Dojo 来实现这一点？
不幸的是，我在 current documentation 中找不到任何提示。 .

以下应该是上面引用的示例到"new"Dojo 的端口。但是，ioargs 将是未定义的:

require( "dojo/request/xhr", "dojo/dom", "dojo/domReady!",
  function(request, dom){
    // Look up the node we'll stick the text under.
    var targetNode = dom.byId("getLicenseStatus");

    // The parameters to pass to xhrGet, the url, how to handle it, and the callbacks.
    request.get(
      "{{dataUrl}}dojo/LICENSE",
      {
        handleAs: "text",
        preventCache: true
      }
    ).then(
      function(data, ioargs){
        // FIXME: ioargs is undefined
        targetNode.innerHTML = "XHR returned HTTP status: " + ioargs.xhr.status;
      },
      function(error){
        targetNode.innerHTML = "An unexpected error occurred: " + error.response.status + ": " + error.response.text;
      }
    );
  }
);

我需要更改什么才能使请求的时间戳和状态代码在加载函数中可用？

Answer 1

request 返回一个特殊的promise ( source ):

Promises returned from dojo/request calls have an additional property not available on standard promises: response. This property is a promise that will resolve to a frozen object (where available) describing the response in more detail:

• url – final URL used to make the request (with query string appended)
• options – options object used to make the request
• text – string representation of the data in the response
• data – the handled data in the response (if handleAs was specified)
• getHeader(headerName) – a function to get a header from the request; if a provider doesn’t provide header information, this function will return null.

因此您应该将 .then 链接到此 promise.response 以访问所有上述属性:

var promise = request.get("{{dataUrl}}dojo/LICENSE");

promise.response.then(function(response) {
    console.log("status", response.status);
    console.log("url", response.url);
    console.log("data", response.data);
});

请参阅 jsFiddle 上的工作示例:http://jsfiddle.net/phusick/6wB2L/