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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
</head>
<body>
  <button onclick="start()">Start</button>
  <script type="text/javascript">
    async function start() {
      console.log('started');
      
      try {
        const res = await fakeAsyncCompute;
        console.log('done with ', res);
      } catch (ex) {
        console.log('ex = ', ex);
      } finally {
        console.log('async over');
      }
    }
        
    const fakeAsyncCompute = {
      then: (successCallback, errorCallback)=>{
        setTimeout(()=> {
          console.log('then'); 
          //successCallback(100);
          errorCallback(200);
        }, 3000);
      }
    }
  </script>
</body>
</html>
 
​
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Jeff-Tianpro
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