JS the shortest way to judge IE browser

From , 3 Years ago, written in JavaScript, viewed 133 times.
URL https://pastebin.vip/view/22eda830
  1.     <script type='text/javascript'>  
  2.     var ie = !-[1,];  
  3.     alert(ie);  
  4.     </script>  
  5.  

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