The Jquery each method jumps out of the loop and gets the return value of the example of

Return false: Will stop the loop (just like using 'break' in a normal loop).
Return true: Skip to the next loop (just like using 'continue' in a normal loop).

function test(){
var success = false;
$(..).each(function () {
   if (..) {
       success = true;
       return false;
   }
});
 return success ;
}

Jquery is an object chain, so $(..) .each() returns a collection of objects. Each (function(){}) : is a callback function, in the callback function cannot return the result to the callback function outside of each.