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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>
 <script>
​
    var done = false;
    var i = 1;
    var t = "https://i.stack.imgur.com/Ya15i.jpg";
​
    while(!done && i < 4)
    {
      console.log("try "+i);
      
      done = chk(t);
      sleep(1000);
      
      i = i+1;
      
      if (done)
      {
        console.log("Reachable!");
         break;
      }
      else
      {
         console.log("Unreachable.");
      }
    }
     
  function chk(target)
  {
    console.log("checking "+target)
    fetch(target, {mode: 'no-cors'}).then(r=>{
    return true;
    })
    .catch(e=>{
    return false;
    });
  }
   
  // busy fake sleep
  function sleep(s)
  {
      var now = new Date().getTime();
      while(new Date().getTime() < now + s){ /* busy sleep */ } 
  }
      
  </script>
</body>
</html>
Output

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anonymouspro
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