Question

假设我有一个循环，我在多个地址上调用WinJS.xhr()。在响应处理程序中，有没有办法确定处理响应的地址？通过从xhr()传递给处理程序的XmlHttpRequest对象中辨别它还是通过手动传递其他内容来进行辨别？

我一直在查看the documentation以及检查调试器中的响应但无法找到任何内容。

Answer 1

我认为信息不在回复中，但并不一定如此。每个xhr调用都有自己的Promise，为特定的调用返回。我喜欢这样做......

//start with an array of some kind
var urls = [
    "http://something.com/1",
    "http://something.com/2",
    "http://something.com/3",
];

//map the array to a list of calls adding your url in so you have it
var results = urls.map(function(u) {
    return {url:u, response:WinJS.xhr({url:u})};
}

然后你可以循环结果数组，你就有了网址。您可能希望将其包装在另一个promise中，因此整个事情都是异步的。

function xhrCallsAsync() {

    //start with an array of some kind
    var urls = [
        "http://something.com/1",
        "http://something.com/2",
        "http://something.com/3",
    ];

    //map the array to a list of calls adding your url in so you have it
    var results = urls.map(function(u) {
        return {url:u, response:WinJS.xhr({url:u})};
    }

    //return a Promise that completes when all of the Promises are complete
    return WinJS.Promise.join(results);
}

希望有所帮助！

从WinJS.xhr响应中获取URL

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