Question

如何监听 js 中变量的变化

Answer 1

一种简单的方法varEventEmitter=require('events');varutil=require('util');functionPerson(name){varname=name;this.getName=function(){returnname;}this.setName=function(newName){if(newName!==name){varoldName=name;name=newName;this.emit("valueChange",{key:'name',oldVal:oldName,newVal:newName})}}}util.inherits(Person,EventEmitter);varperson=newPerson("Zhihu");person.on('valueChange',function(event){//doSomeThing})EventEmitter和util.inherits的具体实现。

Answer 2

通过es5的setter 和getter