【JS】统计字符串数字个数

Osinghong2个月前 (04-28)成果展示72

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>d24c04429</title>
</head>
<body>
    <script>
        var str = prompt("请输入一个任意的字符串");
        var count = 0;
        for (var i = 0; i < str.length; i++) {
            var char = str.charAt(i);
            if (char >= '0' && char <= '9') {
                console.log(char);
                count++;
            }
        }
        alert("字符串内一共有" + count + "个数字");
    </script>
</body>
</html>

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