解析存储在离子3中的常量中的JSON字符串

如何在离子3中解析json字符串 . 我的要求很简单，即只需解析存储在常量中的json，并将其显示在离子中具有上一个和下一个按钮的滑块中 . 只需解析数据并将其存储在array.I先前没有离子和角度的经验 .

代码我尝试过：

import { Component } from '@angular/core';
import { NavController } from 'ionic-angular';
import { Http,Headers } from '@angular/http';
import 'rxjs/add/operator/map';

//////this is the json format.
const questions={
  "setId": 1,
  "setName": "Set-A",
  "totalQuestions": 3,
  "markPerQuestion": 1,
  "totalDuration": 10,
  "questions": [
      {
          "questionId": 1,
          "questionName": "What is the term used for describing the judgmental part of problem solving?",
          "questionInstruction": "Select Correct Answer",
          "questionAnswer": "a",
          "img": "",
          "questionOptions": [
              {
                  "optionId": "a",
                  "optionValue": "Heuristic"
              },
              {
                  "optionId": "b",
                  "optionValue": "Critical"
              },
              {
                  "optionId": "c",
                  "optionValue": "Value based"
              },
              {
                  "optionId": "d",
                  "optionValue": "Analytical"
              },
              {
                  "optionId": "e",
                  "optionValue": "None of the above"
              }
          ]
      },
      {
          "questionId": 2,
          "questionName": "Decision support programs are designed to help managers make:",
          "questionInstruction": "Select Correct Answer",
          "questionAnswer": "d",
          "img": "",
          "questionOptions": [
              {
                  "optionId": "a",
                  "optionValue": "vacation schedules"
              },
              {
                  "optionId": "b",
                  "optionValue": "budget projections"
              },
              {
                  "optionId": "c",
                  "optionValue": "All of the above"
              },
              {
                  "optionId": "d",
                  "optionValue": "business decisions"
              },
              {
                  "optionId": "e",
                  "optionValue": "None of the above"
              }
          ]
      },
      {
          "questionId": 3,
          "questionName": "What was originally called the imitation game by its creator?",
          "questionInstruction": "Select Correct Answer",
          "questionAnswer": "b",
          "img": "",
          "questionOptions": [
              {
                  "optionId": "a",
                  "optionValue": "Cybernetics"
              },
              {
                  "optionId": "b",
                  "optionValue": "The Turing Test"
              },
              {
                  "optionId": "c",
                  "optionValue": "LISP"
              },
              {
                  "optionId": "d",
                  "optionValue": "The Logic Theorist"
              },
              {
                  "optionId": "e",
                  "optionValue": "None of the above"
              }
          ]
      }
  ]
};

@Component({
  selector: 'page-home',
  templateUrl: 'home.html'
})
export class HomePage {

  constructor(public navCtrl: NavController) {
  }

  ionViewDidLoad(){
   this.parsejsondata();
  }

  parsejsondata(){
    const userStr = JSON.stringify(questions);
    JSON.parse(userStr, (key, value) => {
      if (typeof value === 'string') {
        return value.toUpperCase();
      }
      console.log(JSON.parse(value));
      return value;
    });
  }
}

它抛出一个错误：

main.js：1无法加载资源：服务器响应状态为500（内部服务器错误）（索引）：1拒绝从'http：// localhost：8100 / build / main.js'执行脚本，因为其MIME类型（'text / html'）不可执行，并且启用了严格的MIME类型检查 .