NodeJS：尝试推送可读抛出＆＃34;错误：未实现＆＃34;

Question

为什么以下代码（保存为dummy.js）会抛出错误？有什么问题？

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);

执行：

> 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

在推送数组值之后和调用null之前推送pipe。还需要在dest.end = function(data) {};之后添加data.write = ...。