JavaScript数据类型检测方法的全面对比与总结

console.log(typeOf 123) // Number
console.log(typeOf '123') // String 
console.log(typeOf NaN) // Number
console.log(typeOf true) // Boolean
console.log(typeOf undefined) // Undefined
console.log(typeOf function(){}) // Function

console.log(typeOf null) // Object
console.log(typeOf {}) // Object
console.log(typeOf []) // Object

console.log({}.instanceof Object) // true
console.log([].instanceof Array) // true
console.log(123.instanceof Number) // 报错

console.log({}.construct === Object) // true
console.log([].construct === Array) // true
console.log(123.construct === Number) // 报错

console.log(Object.prototype.toString.call(123)) // [object Number]
console.log(Object.prototype.toString.call('ok')) // [object String]
console.log(Object.prototype.toString.call(true)) // [object Boolean]
console.log(Object.prototype.toString.call([]) // [object Array]
console.log(Object.prototype.toString.call({}) // [object Object]
console.log(Object.prototype.toString.call(function(){}) // [object Function]
console.log(Object.prototype.toString.call(/abc/) // [object RegExp]
console.log(Object.prototype.toString.call(null) // [object Null]
console.log(Object.prototype.toString.call(undefined) // [object Undefined]
let d= new Date()
console.log(Object.prototype.toString.call(d) // [object Date]
let s = Symbol
console.log(Object.prototype.toString.call(s) // [object Symbol]