JSFiddle - React, Tailwind, and code Playground

HTML

<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width">
    <title>JS Bin</title>
    <script>
        var Bignumber = 100;
        var Smallnumber = 0;
        var Checknumber = 65;
        function clickdown() {
            document.getElementById('btn').onclick = function (evt) {
                Guest();
            }
        }
            function Guest() {
                if (TextToInt < Checknumber) {
                    alert("正確數字在" + Checknumber + "~" + Bignumber + "之間");
                }
                else if (TextToInt == Checknumber) {
                    alert("Bingo你答對囉!");
                }
                else if (TextToInt > Checknumber) {
                    alert("正確數字在" + Smallnumber + "~" + TextToInt + "之間");
                }
                var TextNum = document.getElementById('Answer').value;
                var TextToInt = parseint(TextNum);
            }
        window.onload = clickdown;
    </script>
</head>
<body>
    <input type="text" id="Answer" placeholder="輸入你的數字">
    <input type="button" value='猜猜看' id="btn">
</body>
</html>






<!--9/19做完之後完全不知道錯在哪->