Judge the data type of JS

Use Object.prototype.toString.call() To determine the array 、 object 、 character string 、 Numeric and Boolean types

Object.prototype.toString.call(1)
// "[object Number]"

Object.prototype.toString.call('string')
// "[object String]"

Object.prototype.toString.call(false)
// "[object Boolean]"

Object.prototype.toString.call({
    })
// "[object Object]"

Object.prototype.toString.call([])
// "[object Array]"