javascript - jQuery.ajax : TypeError: Property 'xhr' of object #<Object> is not a function

Question

我有一个 jquery.ajax 对象，我想在其中替换 xhr。但是执行以下代码会给我一个错误:

TypeError: Property 'xhr' of object #<Object> is not a function

相关代码为:

    var req = jQuery.ajaxSettings.xhr();
    req.upload.addEventListener('progress', calendar.check_progress, false);

    $.ajax({
        url: script_root + '_save_file/'+id+'/'+timestamp,
        type: 'POST',
        processData: false,
        contentType: false,
        data: fd,
        xhr: req,
        success: function(data){
            do_something();
        },
        error: function(data){
            console.log(data);
            do_something_else();
        }
    });

Answer 1

xhr 以其他方式使用。请参阅文档:http://api.jquery.com/jQuery.ajax/

xhr: Function

Default: ActiveXObject when available (IE), the XMLHttpRequest otherwise

Callback for creating the XMLHttpRequest object. Defaults to the ActiveXObject when available (IE), the XMLHttpRequest otherwise. Override to provide your own implementation for XMLHttpRequest or enhancements to the factory.

也许你正在寻找类似的东西

xhr: function() {
    var xhr = $.ajaxSettings.xhr();
    xhr.upload.addEventListener('progress', calendar.check_progress, false);
    return myXhr;
},