问jQuery表单插件在IE中不工作

EN

echo $this->input->post('name');//this is a debuging statement which shows the data sent by client

$("input[type=file]").on('change',function(){
    $(this).parents('.fileinput-wrapper').find('.fileinput-preview').css('background','url(http://localhost/project/assets/images/ajax-loader.GIF) no-repeat center center');
    var selectedElement = this;
    var name = $(this).attr('name').toString();
    $('#upload').ajaxSubmit({
        //dataType:'json',
        data: {name:name},
        success: function(data) {
            $(selectedElement).parents('.fileinput-wrapper').find('.fileinput-preview').css('background',"url('http://localhost/project/assets/images/loading.png') no-repeat center center");
            return false;
        },
        error : function(xhr) {
            alert(xhr.responseText);
            return false;
        }
    });
});