Remove Selected Element in Javascript

<input type="text" id="selectedseat" value="1,2,3,4,5,6">


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 var num = document.getElementById("selectedseat").value;
var arr = num.split(",");
var newoneworld = arr.length;
if(newoneworld==1){var myarr = new Array(arr[0]);}
if(newoneworld==2){var myarr = new Array(arr[0],arr[1]);}
if(newoneworld==3){var myarr = new Array(arr[0],arr[1],arr[2]);}
if(newoneworld==4){var myarr = new Array(arr[0],arr[1],arr[2],arr[3]);}
if(newoneworld==5){var myarr = new Array(arr[0],arr[1],arr[2],arr[3],arr[4]);}
if(newoneworld==6){var myarr = new Array(arr[0],arr[1],arr[2],arr[3],arr[4],arr[5]);}


function removeByElement(arrayName,arrayElement)
 {
  for(var i=0; i<arrayName.length;i++ )
   {
  if(arrayName[i]==arrayElement)
  arrayName.splice(i,1);
  }
  }

removeByElement(myarr,no);

  document.getElementById("selectedseat").value = myarr;

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