將一些參數傳遞給WinJs的回調函數xhr

Question

在Windows 8中，我在一個循環中使用WinJs.xhr來下載一些內容，並且隨後到達「完成回調」時，我想通過一個參數檢索調用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; 
} 
} 

謝謝您的幫助

Answer 1

你需要捕捉到它的關閉，與香草的循環/迭代是一個痛苦：

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]); 
}