使用AJAX实现文件上传时Illegal invocation错误

var formData = new FormData();
            formData.append(‘userName‘,$scope.userName);
            formData.append(‘file‘,$scope.file);
            
            var url ="http://localhost:8080/SpringMVCT/rest/v1/uploader";            
            $.ajax({
                type:‘POST‘,
                url:url,
                data:formData,
                contentType:undefined,
                mimeType:"multipart/form-data",
                success:function(data){
                    
                }
            });

$.ajax({
                type:‘POST‘,
                url:url,
                data:formData,
                contentType:undefined,
                processData:false,
                mimeType:"multipart/form-data",
                success:function(data){
                    
                }
            });