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严格模式,指向undefined
非严格模式,浏览器环境,指向window/globalThis
非严格模式,node环境,指向global
通过对象方法调用的函数内,this指向该对象
通过call,apply,bind方法调用的函数,指向绑定的对象
通过new调用的构造函数内,this指向新创建的对象
箭头函数this指向,取决于定义箭头函数的上下文中this指向