callback 位置, emit 位置

test.js

 require('myconsole').replace();
 var EventEmitter = require('events').EventEmitter; 
 var emitter = new EventEmitter();
 /* 4 */ emitter.on('error', console.ifError); 
 /* 5 */ var err = new Error('error from emitter');
 /* 6 */ emitter.emit('error', err);

输出:

[test.js:4] at [test.js:6] : Error: error from emitter  
    at Object.<anonymous> (...../test.js:5:11)
    at Module._compile (module.js:441:26)
    at Object..js (module.js:459:10)
    at Module.load (module.js:348:31)
    at Function._load (module.js:308:12)
    at Array.0 (module.js:479:10)
    at EventEmitter._tickCallback (node.js:192:40)

https://github.com/guileen/myconsole