..

src/Quiz.js

-import React, { useState } from 'react'
+import React, { useState, useEffect } from 'react'
 import { Link, Redirect } from 'react-router-dom';
 import Timer from 'react-compound-timer'; // 타이머쓰기위해 import
 import logo from './img_question.png'
 
-const QnA = [
-    { Q: "6 X 4 = ?", Choose: [6, 12, 18, 24], N: 1 },
-    { Q: "3 + 3 = ?", Choose: [2, 4, 6, 8], N: 2 },
-    { Q: "3 - 1 = ?", Choose: [1, 2, 3, 4], N: 3 }
-]
 
 let localQnA = JSON.parse(localStorage.getItem('QnA'))
 
 
 
-let Answers = [0, 0, 0]
-localStorage.setItem('Answers', JSON.stringify(Answers))
-let Solutions = [4, 3, 2]
-localStorage.setItem('Solutions', JSON.stringify(Solutions))
+let Answers = []
 
 function Quiz() {
     const [question, setQuestion] = useState({
-        ...QnA[0]
+        ...localQnA[0]
     })
     const [selected, setSelected] = useState("")  //선택한 답을 보여줄 것
 
     const [timeout, settimeout] = useState(false)
-
-    let Answer = []          //빈 배열
+//for each 사용하기
+    let Solutions = []          //빈 배열
     console.log(localQnA)
     localQnA.map((x) => {      //A만 꺼내서 q에 추가
-        
-        return Answer.push(x.A)
+        // Answers.push(0)
+        return Solutions.push(x.A)
     })
-    localStorage.setItem("localAnswer", JSON.stringify(Answer))  //그걸 로컬에 저장
+    useEffect(()=>{for (let i=1 ; i <= Solutions.length;i++){
+        Answers.push(0)
+        localStorage.setItem('Answers',JSON.stringify(Answers))
+        localStorage.setItem("Solutions", JSON.stringify(Solutions)) 
+    }},[])
+    
+      
   
+  //그걸 로컬에 저장
+//foreach 쓰기
     let finalQnA = localQnA.map((x, index) => {
         //delete x.A                       //A 삭제
         return { ...x, N: index + 1 }    //N 추가
@@ -42,7 +42,7 @@ function Quiz() {
 
 
     function handleQuestion() {
-        setQuestion({ ...QnA[question.N] })
+        setQuestion({ ...localQnA[question.N] })
         setSelected("") //페이지 넘어가면 selected 초기화
     }
 
@@ -63,7 +63,7 @@ function Quiz() {
                     </div>
                     <div className="col-md-auto">
                         <div className="h2 mt-2">
-                            {question.Q} {localQnA[0].Q}
+                            {localQnA[0].Q}
                         </div>
                         <div className="mt-2">
                             <form>
@@ -76,16 +76,16 @@ function Quiz() {
                             </form>
                             <span className="h5 font-weight-bold"> Your Answer :</span>
                             <span className="h2 font-weight-bold text-danger"> {selected}</span>  {/* 선택한 값 보여줌 */}
-                            <div className="text-center my-3"> {(question.N - 1 === QnA.length - 1)
+                            <div className="text-center my-3"> {(question.N - 1 === localQnA.length - 1)
                                 ? <Link to="/end">
-                                    <button className="btn btn-outline-success" onClick={localStorage.setItem('Solutions', JSON.stringify(Solutions))}>제출</button>
+                                    <button className="btn btn-outline-success" /*onClick={localStorage.setItem('Solutions', JSON.stringify(Solutions))}*/>제출</button>
                                 </Link>
                                 : <button type="button" className="btn btn-outline-dark" onClick={handleQuestion}>다음</button>
                             }
                             </div>
                             <p className="h3 text-center text-danger ">
                                 <Timer
-                                    initialTime={3001000}
+                                    initialTime={3000}
                                     direction="backward"
                                     checkpoints={[
                                         {