You can use the instanceof
operator:
if (obj instanceof jQuery){
console.log('object is jQuery');
}
Explanation: the jQuery
function (aka $
) is implemented as a constructor function. Constructor functions are to be called with the new
prefix.
When you call $(foo)
, internally jQuery translates this to new jQuery(foo)
1. JavaScript proceeds to initialize this
inside the constructor function to point to a new instance of jQuery
, setting it’s properties to those found on jQuery.prototype
(aka jQuery.fn
). Thus, you get a new
object where instanceof jQuery
is true
.
1It’s actually new jQuery.prototype.init(foo)
: the constructor logic has been offloaded to another constructor function called init
, but the concept is the same.