lovecoding
/
W260426


			
				
					
						
						
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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 res = "";
            for(var i = 0;i<str.length;i++){
                // str.charAt(i)
                // str[i]
                if(str[i]>="0" && str[i]<="9"){
                    res += str[i];
                }
            }
            return res;
        }

        console.log(CollectDigits("1abc23def4"));
    </script>
</body>
</html>