javascript - why is jQuery selector property undefined within each()? -

Looking at the following code, why does the selector properties work in the first instance but not the second? Are not they both jQuery objects?

  & lt; Span class = 'tst' & gt; Span & lt; / Span & gt; One ???? Var tst = $ ('.tst'); Console.log (tst.selector); // print '.tst' $ ('.tst'). Each (function () {console.log (this.selector);}); // print undefined ???? Line Line Line Formula ??? In the context of    
 
 
  this ,  .each ( )  Loop is not a jQuery object, so the  selector  property is undefined.  
 You first need to create a jQuery object:  $ (this). Selector   
 However, it should be noted that the  selector  property returns an empty string while inside  .each  loop.  
  Edit   
 If you have a  selector  in the property  .each () , an option will be sent to your The selector will have to cache:  
  var cached = $ ('.tst'); Cached.each (function () {console.log (cached.selector); // will appear ".tst"});   
 one ????