None.js 第四步 事件驱动程序

// 导入events模块
var events = require(‘events‘);
// 创建eventEmitter对象
var eventEmitter = new events.EventEmitter();

var connectHandler = function connected() {
    console.log(‘链接成功。‘);
    eventEmitter.emit(‘data_received‘);
}
// 监听事件[绑定事件]
eventEmitter.on(‘connection‘, connectHandler);
eventEmitter.on(‘data_received‘, function () {
    console.log(‘数据接收成功。‘);
});
// 触发事件
eventEmitter.emit(‘connection‘);
console.log("程序执行完毕。");