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let arr = ['1', '2', '3']
console.log(arr instanceof Array)
console.log(Object.prototype.toString.call(arr))
console.log(Object.prototype.toString.call(1))
console.log(Object.prototype.toString.call('1'))
console.log(Object.prototype.toString.call(null))
console.log(Object.prototype.toString.call(undefined))
console.log(Object.prototype.toString.call(function() {}))
console.log(Object.prototype.toString.call(Symbol(1)))
console.log(Object.prototype.toString.call({
  name: 'zww'
}))
console.log(Array.isArray(arr))
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