The difference between TypeOf and instanceof in JS

1.typeof returns a type as a string, with 6 types: number,boolean,string,function,object,undefined

typeof (1): Numbertypeof (NaN): Numbertypeof (Number.min_value): Numbertypeof (Infinity): numbertypeof ("123"): Stringtypeof (True): booleantypeof (window): objecttypeof (Array ()): Objecttypeof (function () {}): Functiontypeof ( Document): Objecttypeof (NULL): Objecttypeof (eval): Functiontypeof (Date): functiontypeof (SSS): undefinedtypeof ( Undefined): undefined

2.instanceof is used to determine if an object is an instance of a class, and the return value is TRUE or False

var a = new Array ();

Alert (a instanceof Object);//true;

Alert (window instanceof Object);//high-version browser returns True, previous return false

The difference between TypeOf and instanceof in JS