Javascript function

javascript:(function () {var mention = [];var story_data=document.body.innerText.trim();var id_story=prompt("Number of story:"); JSON.parse(story_data).data.reels_media[0].items[parseInt(id_story) - 1].tappable_objects.forEach(el=> {if(el.__typename == "GraphTappableMention"){mention.push(el.username);}}); if(mention.length !== 0){alert(mention)}else{alert("%D9%85%D8%A7%D9%81%D9%8A%D8%B4")};})();