The difference between the small accumulated--typeof of JavaScript and instanceof

　　1.typeof is the type that gets a variable or expression, the value returned is usually a string, number, Boolean, object (null, Array, object), function, undefined, you can use TypeOf to determine whether a value is empty. eg:if (typeof a! = "undefined") {} 2.instanceof is to determine if a variable has an instance of an object, and the return value is True,false. Eg:var A = new Array (); Console.log (a instanceof Array);

The difference between the small accumulated--typeof of JavaScript and instanceof