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  1. <!DOCTYPE html>
  2. <head>
  3.   <meta charset="UTF-8">
  4. </head>
  5. <body>
  6.   <button onclick="StartInterval();">Start</button>
  7.   <button onclick="StopInterval();">Stop</button>
  8.   <br>
  9.   <div id="Dsp"></div>
  10. </body>
  11. <script>
  12.   var oTestInterval;
  13.   eDsp = document.getElementById("Dsp");
  14.   function StartInterval() {
  15.     console.log("StartInterval()");
  16.     if (!oTestInterval) {
  17.       console.log("if (!oTestInterval)");
  18.       oTestInterval = setInterval(() => {
  19.         eDsp.innerHTML += "*";
  20.       }, 1000);//ms
  21.     }
  22.   }
  23.   function StopInterval() {
  24.     if (oTestInterval) {
  25.       clearInterval(oTestInterval);
  26.       oTestInterval = null;
  27.     }
  28.   }
  29. </script>
  30. </html>
  31.  
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https://ideone.com/kStcsp
language:
Text (text 6.10)
created:
2 years ago
visibility:
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