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Leetcode-js
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258.各位相加.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 addDigits = function(num) {
        function add(num){
         let n = 0;
         let str = num.toString();
         for(var k of str){
            n += parseInt(k);
          }
          return n;
       }
       while(true){
           num = add(num);
           if(num<10&&num>0)  return num;
       }
    }
    alert(addDigits(52));
    </script>
</body>
</html>