相关疑难解决方法(0)

延期,承诺和期货有什么区别？
这三者背后是否有普遍认可的理论？

function makeCall(file, handlerFile, sendMethod, formData) {
    //console.log(instance.files);

    $.ajax({
        url: handlerFile,
        type: sendMethod,
        xhr: function() {  // Custom XMLHttpRequest
            var xhr = $.ajaxSettings.xhr();

            if(xhr.upload) { // Check if upload property exists
                xhr.upload.addEventListener('progress', progressHandlingFunction.bind(file)); // For handling the progress of the upload
                //xhr.upload.addEventListener('loadend', successHandler.bind(xhr));
            }

            //console.log(xhr);

            return xhr;
        },
        beforeSend: beforeSendHandler.bind(file),
        success: completeHandler.bind(file),
        //error: errorHandler,
        data: formData, // Form data
        dataType: 'json',
        cache: true,
        //async: false,
        contentType: false,
        processData: false
    });

}



$(".afu-input").on('change', function() {
        var i = 0;
        var length = …