javascript - how can I test logic under the condition of "'ontouchstart' in window" in JS -

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we have logic under "ontouchstart in window". use popup form desktop website, rest of cases show normal form.

 var isdesktopdevice = !('ontouchstart' in window);   if (isdesktopdevice) {         //popup form  } else {         //normal form  }

i wonder how can test in javascript

many in advance


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