Widget:InitPageBossScript

<script> document.addEventListener('DOMContentLoaded', function () {

 Date.prototype.getWeekNumber = function () {
   let d = new Date(Date.UTC(this.getFullYear(), this.getMonth(), this.getDate()));
   d.setHours(d.getHours() - 7.4);
   let dayNum = d.getUTCDay() || 7;
   d.setUTCDate(d.getUTCDate() + 4 - dayNum);
   let yearStart = new Date(Date.UTC(d.getUTCFullYear(), 0, 1));
   return Math.ceil((((d - yearStart) / 86400000) + 1) / 7)
 };

 const url = window.location.origin;
 const actualWeekNumber = new Date().getWeekNumber();
 const bossCard = document.getElementById('boss-card');

 const bosses = [
   {
     name: 'Entei',
     image: '/images/c/c4/Card_Boss-Fight-Entei.png'
   },
   {
     name: 'Raikou',
     image: '/images/2/28/Card_Boss-Fight-Raikou.png'
   },
   {
     name: 'Suicune',
     image: '/images/8/8b/Card_Boss-Fight-Suicune.png'
   },
 ];

 /*
   1° Entei
   2° Raikou
   3° Suicune 
 */

 bossCard.src = url + bosses[actualWeekNumber % 3].image;
 bossCard.alt = bosses[actualWeekNumber % 3].name;

}); </script>