Reference:
https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Global_Objects/Function/call call
https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Global_Objects/Function/apply apply
https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Global_Objects/Function/bind bind
MDN中定义的Function.prototype.call()和apply()与bind()
原文：https://www.cnblogs.com/JumperMan/p/12290158.html