Imprimez les informations de classe de la fonction :

function classof(obj){ if(typeof(obj)==="undefined")return "undefined"; if(obj===null)return "Null"; var res = Object.prototype.toString.call(obj).match(/^\[object\s(.*)\]$/)[1]; if(res==="Object"){ res = obj.constructor.name; if(typeof(res)!='string' || res.length==0){ if(obj instanceof jQuery)return "jQuery";// jQuery build stranges Objects if(obj instanceof Array)return "Array";// Array prototype is very sneaky return "Object"; } } return res; } // Example console.log(classof(new Date())); // => "Date"