JS怎样计算过关分数

一个游戏，前20关是每一关自身的分数，
//21-30关每一关是10分
//31-40关，每一关是20分
//41-49关，每一关是30分
//50关，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("请输入第几关"))

    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>

巴特西

JS怎样计算过关分数

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