jQuery macht globale Variable
Funktionsübergabea_href = $(this).attr('href'); Wert zu globala_href, machena_href="home"
var a_href;
$('sth a').on('click', function(e){
a_href = $(this).attr('href');
console.log(a_href);
//output is "home"
e.preventDefault();
}
console.log(a_href);
//Output is undefined