NodeJs的events模块
on和addListener方法类似于jQuery中的on
字符串”hello”是一个触发事件, myEvent.emit("hello
")匹配触发事件, 执行后面的函数, 打印”world”
const event = require('events');
let myEvent = new event.EventEmitter();
myEvent.on("hello", function (msg) {
console.log(msg)
});
myEvent.emit("hello", "world") //world