Note.js的stream用法一例

 

Note.js，用stream读取文件的内容，注意decoder的用法

const fs = require('fs');   var rr = fs.createReadStream('data\\foo.txt');   // Pull off a header delimited by \n\n // use unshift() if we get too much // Call the callback with (error, header, stream) const StringDecoder = require('string_decoder').StringDecoder; function parseText(stream, callback) { stream.on('error', callback); stream.on('readable', onReadable); var decoder = new StringDecoder('utf8'); var header = ''; function onReadable() { var chunk; while (null !== (chunk = stream.read())) { var str = decoder.write(chunk); console.log(str); } } }   parseText(rr,     function(source, header, stream )     {         console.write(header);     }   );