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190.颠倒二进制位.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>
<body>
    <script>
   var reverseBits = function(n) {
       let arr = n.toString(2).split("");
       let k = arr.length;
       for(let i = 0;i<32-k;i++){
           arr.unshift(0);
       }
       let num = 0;
       for(let i=0;i<arr.length+1;i++){
           if(arr[i]==="1"){
            num+=Math.pow(2,i);
           }
       }
      return num;
    };
    </script>
</body>
</html>