Question

我能够下载文件。但是我想查找文件的下载状态，即下载是否完成（或）完成了多少％。

任何人都可以帮我解决这个问题...

我的index.js：

var express = require('express');
var router = express.Router();
var fs = require('fs');
var request = require('request');


var download = function(uri, filename, callback){
  request.head(uri, function(err, res, body){
    console.log('content-type:', res.headers['content-type']);
    console.log('content-length:', res.headers['content-length']);

    request(uri).pipe(fs.createWriteStream(filename)).on('close', callback);
  });
};


download('https://www.google.com/images/srpr/logo3w.png', 'google.png', function(){
  console.log('done');
});



module.exports = router;

Answer 1

你以前见过这个节点包吗？

https://www.npmjs.com/package/request-progress

您可以将其与请求结合使用来报告进度，如下所示：

var request = require('request');
var progress = require('request-progress');

// Note that the options argument is optional 
progress(request('http://google.com/doodle.png'), {
    throttle: 2000,  // Throttle the progress event to 2000ms, defaults to 1000ms 
    delay: 1000      // Only start to emit after 1000ms delay, defaults to 0ms 
})
.on('progress', function (state) {
    console.log('received size in bytes', state.received);
    // The properties bellow can be null if response does not contain 
    // the content-length header 
    console.log('total size in bytes', state.total);
    console.log('percent', state.percent);
})
.pipe(fs.createWriteStream('doodle.png'))

希望这有帮助！

如何使用node.js附加文件的下载状态

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