<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>

<script>
    function randomInteger(min, max) {
        var rand = min + Math.random() * (max + 1 - min);
        rand = Math.floor(rand);
        return rand;
    }

    function checkDex() {
        //Атакующий
        AttackerLevel = parseInt($('#AttackerLevel').val());
        AttackerDex = parseInt($('#AttackerDex').val());
        AttackerLuc = parseInt($('#AttackerLuc').val());
		AttackernPerAttack = AttackerDex * 0.5 + AttackerLevel;
		AttackernPerDefense = AttackerLuc * 0.125 + AttackernPerAttack;

        //Атакуемый
        AttackedLevel = parseInt($('#AttackedLevel').val());
        AttackedDex = parseInt($('#AttackedDex').val());
        AttackedLuc = parseInt($('#AttackedLuc').val());
		AttackednPerAttack = AttackedDex * 0.5 + AttackedLevel;
		AttackednPerDefense = AttackedLuc * 0.125 + AttackednPerAttack;

		//nAttackTypel = AttackednPerAttack + AttackernPerDefense;
		//nAttackTypem = AttackernPerAttack + AttackednPerDefense;
		nAttackTypem = AttackednPerAttack + AttackednPerDefense;
		nAttackTypek = AttackednPerAttack / (AttackernPerAttack + AttackernPerDefense);
		procent = AttackerLevel / (AttackerLevel + AttackedLevel) * 160.0 - (nAttackTypek * 100.0 - AttackernPerAttack / nAttackTypem * 100.0);

		console.log(nAttackTypek);

        if (procent >= 1) {
            if (procent > 99)
                procent = 99;
        }
        else {
            procent = 1;
        }

        if (randomInteger(0, 100) >= procent) {
            console.log('Вы не попали: ' + procent + '% шанс.');
            return 0;
        }
        console.log('Вы попали: ' + procent + '% шанс.');
        return 1;
    }
</script>

<table>
    <th>Атакующий</th>
    <th>Атакуемый</th>
    <tr>
        <td>
            <input type="text" id="AttackerLevel" placeholder="Уровень" value="60"><br>
            <input type="text" id="AttackerDex" placeholder="Ловкость" value="1500"><br>
            <input type="text" id="AttackerLuc" placeholder="Удача" value="11"><br>
        </td>
        <td>
            <input type="text" id="AttackedLevel" placeholder="Уровень" value="60"><br>
            <input type="text" id="AttackedDex" placeholder="Ловкость" value="3000"><br>
            <input type="text" id="AttackedLuc" placeholder="Удача" value="12"><br>
        </td>
    </tr>
</table>
<div id="chance"></div>
<input type="submit" onclick="checkDex()">