NodeJS：嘗試推動可讀性拋出「Error：not implemented」

Question

爲什麼下面的代碼（保存爲dummy.js）會引發錯誤？什麼是修復？

var Stream = require('stream'); 

var src = new Stream.Readable(); 

var dest = new Stream(); 
dest.writable = true; 
dest.write = function(data) { console.log("dest:",data); }; 

["1","2","3"].forEach(function(f) { console.log(f); src.push(f); }); 

src.pipe(dest); 

執行：

> node dummy.js 
1 
2 
3 

events.js:72 
     throw er; // Unhandled 'error' event 
      ^
Error: not implemented 
    at Readable._read (_stream_readable.js:446:22) 
    at Readable.read (_stream_readable.js:320:10) 
    at Readable.on (_stream_readable.js:701:14) 
    at Readable.pipe (_stream_readable.js:556:10) 
    at Object.<anonymous> (/home/jay/dummy.js:16:5) 
    at (etc.) 

Answer 1

推null推陣列值之後和呼叫pipe之前。 data.write = ...之後還需要添加dest.end = function(data) {};。