JavaScript determines whether an object is an array, and the element object

General there are two ways, the first is the method of jquery, the second is JS original Method 1. $.isarray (obj) 2. Obj instanceof array is actually found to be able to determine whether an object is an array, but only the object of a simple object, for a complex jquery object array but return false, to determine the jquery object arrays, I am currently doing is typeof (obj) = = "Object" && obj.length > 1//array belongs to object, and array length is greater than 1 In addition jquery encapsulates the InArray () function to determine whether an element exists in an array: $.inarray (Array,value)

JavaScript determines whether an object is an array, and the element object