如何在节点js中find文件的大小

我用multer上传我的图片和文档,但是这次我想限制上传,如果图像的大小是> 2mb。如何find文档的文件的大小? 到目前为止,我尝试了如下但不工作。

var storage = multer.diskStorage({ destination: function (req, file, callback) { callback(null, common.upload.student); }, filename: function (req, file, callback) { console.log(file.size+'!!!!!!!!!!!!!!')======>'Undefined' var ext = ''; var name = ''; if (file.originalname) { var p = file.originalname.lastIndexOf('.'); ext = file.originalname.substring(p + 1); var firstName = file.originalname.substring(0, p + 1); name = Date.now() + '_' + firstName; name += ext; } var filename = file.originalname; uploadImage.push({ 'name': name }); callback(null, name); } }); 

任何人都可以请帮助我。谢谢。

 var fs = require("fs"); //Load the filesystem module var stats = fs.statSync("myfile.txt") var fileSizeInBytes = stats["size"] //Convert the file size to megabytes (optional) var fileSizeInMegabytes = fileSizeInBytes / 1000000.0 

要么:

 function getFilesizeInBytes(filename) { var stats = fs.statSync(filename) var fileSizeInBytes = stats["size"] return fileSizeInBytes }