fix:修复移除结束按钮导致dom获取不到的bug

src/dom.js

@@ -1,4 +1,5 @@
 // DEBUG: 该文件仅适用于测试调试程序 正式版删除
+
 import { sendMessage } from './frame';
 
 // 事件功能按钮 绑定动作 发送消息
@@ -63,17 +64,14 @@ export function setPauseButtonStatus(type) {
 export function changeButtonsDisplay(eventType) {
   const start = $id('start');
   const pause = $id('pause');
-  const finish = $id('finish');
   const actionContainer = $id('action-container')
   if (eventType === 'start') { // 点了开始
     start.classList.add('d-none');
     pause.classList.remove('d-none');
-    finish.classList.remove('d-none');
     actionContainer.classList.remove('d-none');
   } else if (eventType === 'finish') {
     start.classList.remove('d-none');
     pause.classList.add('d-none');
-    finish.classList.add('d-none');
     actionContainer.classList.add('d-none');
   } else if ((eventType === 'pause')) {
     actionContainer.classList.add('d-none');