按钮的单双击事件

js代码：
 1 <script type="text/javascript">
 2         let clickNotes = 0;
 3         let timeover = null;
 4         function back() {
 5             clickNotes++;
 6             if (timeover) clearTimeout(timeover);
 7               
 8             timeover = setTimeout(() => {
 9                 if (clickNotes == 1) {
10                     // do something 点击一次触发
11                     console.log(-1);
12                     window.history.go(-1);
13                 } else {
14                     // do something 点击两次触发
15                     console.log('关闭');
16                     window.close();
17                 }
18                 timeover = null;
19                 clickNotes = 0;
20             }, 1000);
21         }
22     </script>