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Leetcode-js
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202.快乐数.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 isHappy = function(n) {
        function getNext(num){
            let str = num.toString();
            let target = 0;
            for(let i=0;i<str.length;i++){
                target+=Math.pow(str.charAt(i),2);
            }
            return target;
        }
        let mySet = new Set();
        mySet.add(n);
        while(1){
            n = getNext(n);
            if(n===1)  return true;
            if(mySet.has(n)) return false;
            else mySet.add(n);
        }
    };
   alert(isHappy(19));
    </script>
</body>
</html>