请求vue前辈教一下这一段代码的意思

methods:{
            async start(){
                const res = await fetch(`/driverLicense/queryQuestionList?${ Object.keys(this.form).map(k=> `${k}=${this.form[k]}`).join('&') }`).then(r=> r.json())
                if(res.statusCode != "000000") return;
                this.list = res.result.driverQuestionList.filter(v=> (v.answerInfo = v.showAnswer = false) ||  v.questionType != 3)
                this.cur = 2;
            },
            reset(){
                this.cur = 1;
                this.list = [];
                this.listIdx = 0;
            },
            answer(id){
                if(!this.question.showAnswer) this.question.answerInfo = id;
            },
            next(down){
                this.listIdx += (down ? 1 : -1 );
            },
            sub(){
                const len = this.list.length;
                const success = this.list.filter(v=> v.answerInfo == v.key).length;
                alert(`你答对了${ success }道题，答错了${ len - success }道题.  最终得分: ${ (success / len * 100).toFixed(2)}分`)
            }
        }
        
        
    }

methods:{
            async start(){
                const res = await fetch(`/driverLicense/queryQuestionList?${ Object.keys(this.form).map(k=> `${k}=${this.form[k]}`).join('&') }`).then(r=> r.json())
                if(res.statusCode != "000000") return;
                this.list = res.result.driverQuestionList.filter(v=> (v.answerInfo = v.showAnswer = false) ||  v.questionType != 3)
                this.cur = 2;
            },
            reset(){
                this.cur = 1;
                this.list = [];
                this.listIdx = 0;
            },
            answer(id){
                if(!this.question.showAnswer) this.question.answerInfo = id;
            },
            next(down){
                this.listIdx += (down ? 1 : -1 );
            },
            sub(){
                const len = this.list.length;
                const success = this.list.filter(v=> v.answerInfo == v.key).length;
                alert(`你答对了${ success }道题，答错了${ len - success }道题.  最终得分: ${ (success / len * 100).toFixed(2)}分`)
            }
        }
        
        
    }

start获取问题列表，reset回到第一题，answer将问题标记为已回答，next切换上一题下一题，sub计算结果

不就是5个函数嘛？代码逻辑也很简单，哪里看不明白？