Илья Хребет

if (document.referrer !== 'сайт.ру/паге1') {
  window.location = "сайт.ру/паге3";
}

function persistence(num) {
    function multiply(n) {
        return n.reduce(function(a, b) {
            return a * b;
        });
    }

    var count = 0;

    while (num.toString().length > 1) {
        num = num.toString().split("");
        num = multiply(num);
        count++;
    }
    return count;
}

console.log(persistence(999));

<div class="top-line" style="display:none;">
Содержание
<a href="#" class="close">Закрыть</a>
</div>

if (!localStorage.getItem("tol-line-showed")) {
  $('.top-line').fadeIn();
}

$('.top-line .close').click(function() {
  localStorage.setItem("tol-line-showed", "true");
  $('.top-line').fadeOut();
});

const text = 'Lorem ipsum dolor sit amet, //sindresorhus.com consectetuer adipiscing http://yeoman.io elit.';

getUrls(text);
//=> Set {'http://sindresorhus.com', 'http://yeoman.io'}

var timeStampInMs = window.performance && window.performance.now && window.performance.timing && window.performance.timing.navigationStart ? window.performance.now() + window.performance.timing.navigationStart : Date.now();

console.log(timeStampInMs, Date.now());

var is_menu_open = false;

$('.menu-button').click(function () {
  is_menu_open = true;
  $('.menu').toggleClass('menu_active');
  $('.menu-button').toggleClass('hidden');
  $('.menu-close').toggleClass('hidden');
});

$('.menu-close').click(function () {
  is_menu_open = false;
  $('.menu').toggleClass('menu_active');
  $('.menu-button').toggleClass('hidden');
  $('.menu-close').toggleClass('hidden');
});

$(document).mouseup(function (e) {
  if (is_menu_open) {
    var menu = $("#menu-target");
    if (!menu.is(e.target) && menu.has(e.target).length === 0) {
      $('.menu-close').click();
      is_menu_open = false;
    }
  }
});