change eventlet to threading

Html/apps/static/js/chatbox.js

@@ -20,7 +20,6 @@ document.addEventListener('DOMContentLoaded', function() {
         const serverMessage = document.createElement('div');
         serverMessage.innerHTML = `<div class="chat-message server-message"><b>华实君:</b> ${marked.parse(data)}</div>`;
         document.getElementById('chatbox').appendChild(serverMessage);
-
         // 滚动到最新消息
         document.getElementById('chatbox').scrollTop = document.getElementById('chatbox').scrollHeight;
     });