Javascript 如何在 Node.js 中找到文件的大小？
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How to find the size of the file in Node.js?
提问by Daniel
I am using multer for uploading my images and documents but this time I want to restrict uploading if the size of the image is >2mb. How can I find the size of the file of the document? So far I tried as below but not working.
我正在使用 multer 上传我的图像和文档，但这次我想限制上传，如果图像的大小大于 2mb。如何找到文档文件的大小？到目前为止，我尝试如下但没有工作。
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);
}
});
Can anyone please help me?
谁能帮帮我吗？
回答by Jameel
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
or:
或者：
function getFilesizeInBytes(filename) {
var stats = fs.statSync(filename)
var fileSizeInBytes = stats["size"]
return fileSizeInBytes
}
回答by gerryamurphy
In addition, you can use the NPM filesize package: https://www.npmjs.com/package/filesize
另外，你可以使用 NPM filesize 包：https: //www.npmjs.com/package/filesize
This package makes things a little more configurable.
这个包使事情变得更加可配置。
var fs = require("fs"); //Load the filesystem module
var filesize = require("filesize");
var stats = fs.statSync("myfile.txt")
var fileSizeInMb = filesize(stats.size, {round: 0});
For more examples:
https://www.npmjs.com/package/filesize#examples
回答by Dawson B
The link above by @gerryamurphy is broken for me, so I will link to a package I made for this.
@gerryamurphy 上面的链接对我来说已损坏，因此我将链接到我为此制作的包。
https://github.com/dawsbot/file-bytes
https://github.com/dawsbot/file-bytes
The API is simple and should be easily usable:
API 很简单，应该很容易使用：
fileBytes('README.md').then(size => {
console.log(`README.md is ${size} bytes`);
});
fileBytes('README.md').then(size => {
console.log(`README.md is ${size} bytes`);
});
Let me know if you need any help!
如果您需要任何帮助，请告诉我！
回答by Nadav
If you only need to find the size of one file in bytes it only takes 2 lines (one if the fs module is already declared):
如果您只需要以字节为单位查找一个文件的大小，则只需 2 行（如果 fs 模块已经声明，则为 1 行）：
const fs = require('fs');
const {size} = fs.statSync('path/to/file');
回答by Lucaci Andrei
You can also check this package from npm: https://www.npmjs.com/package/file-sizeof
你也可以从 npm 中查看这个包：https://www.npmjs.com/package/file-sizeof
The API is quite simple, and it gives you the file size in SIand IECnotation.
API 非常简单，它为您提供文件大小SI和IEC符号。
const { sizeof } = require("file-sizeof");
const si = sizeof.SI("./testfile_large.mp4");
const iec = sizeof.IEC("./testfile_large.mp4");
And the resulting object represents the size from B(byte) up to PB(petabyte).
结果对象表示从B(byte) 到PB(petabyte) 的大小。
interface ISizeOf {
B: number;
KB: number;
MB: number;
GB: number;
TB: number;
PB: number;
}
回答by Fall Bay
Using the following:
使用以下内容：
window.require("fs")
window.require("fs")
Instead of just:
而不仅仅是：
require("fs")
require("fs")
Resolved this issue for me.
为我解决了这个问题。
