多次调用settimeout 如何使用单例模式

 <script>
     function aaa() {
         window.counter = window.counter||1;
         console.log(window.counter);
         window.counter++;
         window.caonima= setTimeout(‘aaa()‘, 1000);
     }
     $(document).ready(function () {
         $(‘#c1‘).click(function () {
             if (window.caonima) {
                 clearTimeout(window.caonima);
                 window.counter = 1;
             }
             aaa();
         })
     })
 </script>