<html lang="en">
    <head>
        <meta charset="UTF-8">
    </head>
    <body>

        <script>
            const _getUniqueNums = (start,end,n) => {
                //刀耕火种  
			    var nullArr=[];
				for(var i=0;i<n;i++){
				  var num = Math.floor(Math.random() * (end - start + 1) + start);
				  nullArr.push(num)
				}
				let lastArr = [...new  Set(nullArr)]
             
                 return lastArr
            }
			
			console.log(_getUniqueNums(10,20,6))
        </script>
    </body>
</html>