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27. this指向问题
2022-06-11 19:54:00 【Suyuoa】
如果直接console.log(this)，会返回window
把console.log(this)搞在函数中，直接调用函数this也指向window
把test()当做回调函数给定时器，也是指向window
放在对象中会指向对象
搞在一个事件中会指向触发事件的对象
构造函数中指向被构造出来的实例
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