摘要：
JavaScript works behind the scenes —— hoisting and TDZ(变量提升和暂时性死区) concept Makes some types of variables accessible/usable in the code before they are 阅读全文
摘要：
JavaScript works behind the scenes —— scope and scope chain(作用域和作用域链) what is scope? (作用域的概念) Scope: Space and environment in which a certain variable 阅读全文