js异步方式

var fs = require("fs");

fs.readFile(‘input.txt‘,‘utf8‘, function (err, data) {
    if (err) return console.error(err);
    console.log(data.toString());
});

console.log("程序执行结束!");

var events = require(‘events‘);
var emitter = new events.EventEmitter();

var events = require(‘events‘);
var emitter = new events.EventEmitter();

emitter.on(‘event1‘, function(arg) {
console.log(‘1-Lisn‘, arg);
});

emitter.on(‘event2‘, function() {
console.log(‘2-LisnA‘, arguments[1]);
});
emitter.on(‘event2‘, function() {
console.log(‘2-LisnB‘, arguments[0]);
});

emitter.emit(‘event2‘, ‘吃饭‘, ‘睡觉‘);
console.log("//////////////////////");
emitter.emit(‘event1‘, ‘学习‘,‘看电视‘);