Node.js event loop

Event loop

Node.js single thread is similar to entering a while(true) event loop until no event observer exits.

Each asynchronous event generates an event observer , if an event occurs, the callback function is called.

Case: loop.js

[code]// 引入 events 模块
var events = require('events');
// 创建 eventEmitter 对象
var eventEmitter = new events.EventEmitter();
// 创建事件处理程序
var connectHandler = function () {
    console.log('连接成功');

    // 触发 data_received 事件
    eventEmitter.emit('data_received');
}
// 绑定 connectHandler 事件处理程序
eventEmitter.on('connection', connectHandler);

// 使用匿名函数绑定 data_received处理事件处理函数
eventEmitter.on('data_received', function () {
    console.log('数据接收成功');
})
// 触发 connection 事件
eventEmitter.emit('connection');
console.log('执行完毕');

Result:

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