基本数据类型:String Number Boolean Undefined Null Symbol
引用数据类型:Object Array Function
console.log(typeof undefined) //undefined
console.log(typeof null) //object
console.log(typeof NaN) // number
console.log(typeof {}) //object
console.log(typeof []) //object
console.log(typeof demo) //function
function demo(){}
console.log(typeof Object) //function
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