lass="operation">{{operation}}</span>
            <span class="number">{{numbers[1]}}</span>
            <span class="operation">=</span>
            <span class="button show" v-show="isThinking" @click="getResult">?</span>
            <span class="result" v-show="!isThinking">{{result}}</span>
        </div>
        <div class="judgment" :style="{visibility: isThinking ? 'hidden' : 'visible'}">
            <span class="button right" @click="answerRight">✔</span>
            <span class="button wrong" @cl