无法在jquery内部使HTTP请求同步

Question

所以这是我的代码，我正在努力上传分块文件，我有一个2D数组，数组中的每个单元格都包含另一个数组，其中包含每个文件信息，然后是实际的文件数据，我无法在输入完成函数后立即发出http请求，而不是在执行for循环后调用它。我无法找到使用IIFE和闭包的工作。请指导。这是代码：

 function chunkBinary(chunkFile){
    var reader = new FileReader();
    var deferred = $.Deferred();
    reader.onloadend = (function(reader)
    {
        return function()
        {
            deferred.resolve(reader.result);
        }
    })(reader);
    reader.readAsBinaryString(chunkFile);
    console.log('returning chunk data as binary');
    return deferred.promise();
 }
//changing screen and going to next step
function showUploadProgress(){
    //display the new body first with all files
    for (var i=0; i<chunk.length; i++) {
        console.log('I is: ' + i);
        console.log(chunk[i]);

        globalfileSize = chunk[i][2];
        //var fileType = chunk[i][2];
        globalfileName = chunk[i][3];
        globalChunkLen = chunk[i].length;
        var pctLoaded = 0;
        //call upload service  on chunks (chunk[i][0..3] is file info)
        for(j=4; j < chunk[i].length;j++){
            console.log('entered for-loop 2 which loops over each chunk');
            $.when(chunkBinary(chunk[i][j]))
                .done(function(result){ 
                    chunkInBinary = result;
                    var md = configOptions.data.buildPrice.dataSource['uploadEquipmentPhotosDocuments'].$d($_QUOTES.obj_quote_info.quoteNumber, $_scope.equipInfo.summary.id);
                    var chunkType = '';
                    if( j==4){ chunkType = 'First'; }
                    else if( j == globalChunkLen-1) { chunkType = 'Last'; }
                    else { chunkType = 'Middle'; }
                    var data = {"file":chunkInBinary,"chunkType":chunkType,"fileName":globalfileName,"fileSize":globalfileSize};
                    console.log('making http request for chunk');
                    return $_http(
                            {url: md, 
                             method: 'POST', 
                             data:JSON.stringify(data),
                             headers: {'Content-Type': 'multipart/form-data'}                
                            }).success(function (data, status, headers, config) {
                                    console.log(j,i);
                                    console.log('chunk sent');
                                    console.log(chunkType);
                                    console.log(globalfileName);
                                    console.log(globalfileSize);
                                    pctLoaded = (j+1)*100/(chunk[i].length -4);
                                    console.log(pctLoaded);
                            }).error(function (data, status, headers, config) {
                                    console.log(j,i);
                                    console.log('chunk error');
                                    console.log(chunkType);
                                    console.log(globalfileName);
                                    console.log(globalfileSize);
                            });
                });
        }
        console.log('I incremented');
}

}

对于它的价值，这是我尝试上传一个文件后控制台的屏幕截图。