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typeofinfo// Uncaught ReferenceError: info is not definedtypeofreq// Uncaught ReferenceError: Cannot access 'req' before initializationletinfo='111'constreq=2
typeof
null
特殊返回object
以外,其他的都能返回其正确的类型function
类型会返回function
以外,其他一律返回object
类型因块级作用域声明
let
和const
会导致暂时性死区,因此在这些变量声明前使用typeof执行会抛出ReferenceError
异常instanceof
实现
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