我将回调更改为：
request.addListener('response', function (response) {
var downloadfile = fs.createWriteStream(filename, {'flags': 'a'});
sys.puts("File size " + filename + ": " + response.headers['content-length'] + " bytes.");
response.addListener('data', function (chunk) {
dlprogress += chunk.length;
downloadfile.write(chunk, encoding='binary');
});
response.addListener("end", function() {
downloadfile.end();
sys.puts("Finished downloading " + filename);
});
});
这工作得很好。
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