将一些参数传递给WinJs xhr的回调函数

Question

在Windows 8中，我在一个循环中使用WinJs.xhr来下载一些内容，当它到达“完成回调”后，我想传递一个参数来检索调用xhr的元素。

    for (var k = 0 ; k < 9; k++) {
                        var title = dataArray[k].name;
                        if (title != null)
                            url = monUrl+ title;

                        WinJS.xhr({ url: url, responseType: "responseXML" })
   .done(function complete(result) {

    //I would like to retrieve the right title here for example
       var dataArray = new Array();
       var xml = result.responseXML;
 }
}

感谢您的帮助

Answer 1

你需要在一个闭包中捕获它，它带有vanilla for循环/迭代是一种痛苦：

for (var k = 0 ; k < 9; k++) {
    (function(item) {
        var url;
        var title = item.name;
        if (title != null)
            url = monUrl+ title;

        WinJS.xhr({ url: url, responseType: "responseXML" }).done(function complete(result) {
            // I would like to retrieve the right title here for example
            var dataArray = new Array();
            var xml = result.responseXML;
            /* use your title property here */
        });
    })(dataArray[k]);
}