📄️ Closure 闭包闭包的形成📄️ FE toolLexical Analysis📄️ Getting StartedFront end📄️ Lexical analyzerage >= 18📄️ Object 面向对象面向对象的语义特征📄️ Scope & ExtentScope📄️ Syntactic AnalysisRecursive Descent Parsing📄️ 继承和多态视频📄️ 语义分析类型系统