[рони]

nasqad,
Вариант не ловит повторы и ноль ....

function getIntersection(a, b) {
    return a.filter(function (c) {
        return b.indexOf(c) != -1 && c;
    })
};
alert( getIntersection([0,-1,3,-4,5,2,6,3,3,3,3],[-1,0,8,1,2,9,3,-4,5,7,0]) )
function get(c, d) {
    var a = {};
    c.map(function (b) {
        a[b] = !0
    });
    return a = d.filter(function (b) {
        return a[b]? (a[b]=!1,!0):!1

    })
};
alert( get([0,-1,3,-4,5,2,6,3,3,3,3],[-1,0,8,1,2,9,3,-4,5,7,0]) )