Javascript 如何更改图像的名称？

安格拉斯

app.directive('fileModel', ['$parse', function ($parse) {
return {
    restrict: 'A',
    link: function(scope, element, attrs) {
        var model = $parse(attrs.fileModel);
        var modelSetter = model.assign;

        element.bind('change', function(){
            scope.$apply(function(){
                modelSetter(scope, element[0].files[0]);
            });
        });
    }
};
}]);

app.service('fileUpload', ['$http', function ($http) {
this.uploadFileAndFieldsToUrl = function(file, fields, uploadUrl){
    var fd = new FormData();
    fd.append('file', file);
    console.log(file) //File { name: "franklindroosevelt1.jpg", lastModified: 1522139208000, lastModifiedDate: Date 2018-03-27T08:26:48.000Z, webkitRelativePath: "", size: 63159, type: "image/jpeg" }
    for(var i = 0; i < fields.length; i++){
        fd.append(fields[i].name, fields[i].data)

    }
    console.log(file)//File { name: "franklindroosevelt1.jpg", lastModified: 1522139208000, lastModifiedDate: Date 2018-03-27T08:26:48.000Z, webkitRelativePath: "", size: 63159, type: "image/jpeg" }
    $http.post(Appname+"/upload_image/", fd, {
        transformRequest: angular.identity,
        headers: {'Content-Type': undefined}
    })
    .success(function(){
    })
    .error(function(){
    });
}
}]);


app.controller('myCtrl', ['$scope', 'fileUpload', function($scope, fileUpload){

$scope.$watch('myFile', function(newFileObj){
    if(newFileObj)
        $scope.filename = newFileObj.name;
});

$scope.uploadForm = function(){
    var file = $scope.myFile;
    var uploadUrl = "/formUpload";
    var fields = [{"name": "filename", "data": $scope.filename}];
    fileUpload.uploadFileAndFieldsToUrl(file, fields, uploadUrl);
};

}]);

HTML

我已经写了一个代码上传到目录中的图像，在这里我想改变图像名称的基础上输入文本或任何随机名称。我不能改变名称，名称保持不变，而上传。是否有其他方式发送姓名。请帮帮我

有没有其他方式发送姓名

以下代码显示了如何在同一请求中以字符串和文件的形式发送名称：

myApp.service('fileUpload', ['$http', function ($http) {
    this.uploadFileToUrl = function(file, uploadUrl){
        var fd = new FormData();
        fd.append('file', file);

        var info = {
            "text":"file_name"
        };
        fd.append('data', angular.toJson(info));

        $http.post(uploadUrl, fd, {
             transformRequest: angular.identity,
             headers: {'Content-Type': undefined}
        })

        .success(function(){
        })

        .error(function(){
        });
    }
}]);

在服务器端，它位于req.body.data中，因此可以接收，即如下所示：

upload(req, res, function (err) {
    if (err) {
        res.json({error_code: 1, err_desc: err});
        return;
    }

    console.log(req.body.data);

    res.json({error_code: 0, err_desc: null});
})

使用fd.appendfields[i].name，new Date.getTime+''.+fields[i].name代替fd.appendfields[i].name，fields[i].data。并在loop console.logfd之后签入fd变量。

upload(req, res, function (err) {
    if (err) {
        res.json({error_code: 1, err_desc: err});
        return;
    }

    console.log(req.body.data);

    res.json({error_code: 0, err_desc: null});
})