Find and unique all emails in page (javascript)

findallmailsonpage.js

var body = window.document.body.innerHTML;
//var body = document.querySelector('td.Bu').innerHTML 
var regular = /\b[A-Z0-9._%+-]+@[A-Z0-9.-]+\.[A-Z]{2,4}\b/ig;
var arrayUnique = function(a) {
    return a.reduce(function(p, c) {
        if (p.indexOf(c) < 0) p.push(c);
        return p;
    }, []);
};
arrayUnique(body.match(regular));