ntIndex];
        },
        submitAnswer() {
          const correct = this.currentQuestion.answers;
          const selected = [...this.selectedAnswers].sort();
          const correctSorted = [...correct].sort();

          let statusText = '', statusClass = '';
          if (JSON.stringify(selected) === JSON.stringify(correctSorted)) {
            statusText = '完全正确';
            statusClass = 'correct';
            this.correctQuestions.push(this.currentQuestion);
            localStorage.setIt