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JS怎樣計算過關分數

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一個遊戲,前20關是每一關自身的分數,
//21-30關每一關是10分
//31-40關,每一關是20分
//41-49關,每一關是30分
//50關,是100分

<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8">
        <title></title>
    </head>
    <body>
    </body>
</html>
<script type="text/javascript">
    var guanQia 
= parseInt(prompt("請輸入第幾關")) if (guanQia<=20) { alert(guanQia) } else if (guanQia>20 && guanQia<=30 ){ (guanQia=(guanQia-20)*10+20) alert(guanQia) } else if (guanQia>30 && guanQia<=40){ (guanQia=(guanQia-30)*20+120) alert(guanQia) }
else if (guanQia>40 && guanQia<=49){ (guanQia=(guanQia-40)*30+320) alert(guanQia) } else if (guanQia=50){ (guanQia=100+590) alert(guanQia) } </script>

JS怎樣計算過關分數