lovecoding
/
Web1020


			
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							<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <script>
       

        function CollectDigits(str) {
            var arr = str.split("");
            // console.log(arr);
            var res = "";
            for (var i = 0; i < arr.length; i++) {
                if (arr[i] >= '0' && arr[i] <= '9') {
                    res += arr[i];
                }
            }
            return res;
        }
       
        console.log(CollectDigits("a2s4d7"));
        
    </script>
</body>

</html>