How to split string using split() using jquery

Question

I want to split the 1&90 into 1 and 90 and assign in different variable.

$(document).on("click", "a[name='delete_user_journal']", function (event, element) {

    var el = $(element);
    event.preventDefault();
    var j_id = $(this).attr("href");
    alert(j_id); // 1&90
}