小编yas*_*ksi的帖子

我正在运行命令作为npm列表,我得到下面提到的列表作为我的依赖项,我想知道重复的意义是什么,请让我知道这个的含义.

我有名为isAuthenticated的道具，它还显示某些情况警告在控制台中仍然存在。请检查一下。

import React,{Component} from "react";
import {BrowserRouter as Router, Switch, Route} from "react-router-dom";
import LogoutHome from './Logout_Home';
import SignIn from '../Components/SignIn';
import jwt_decode from 'jwt-decode';
import {setCurrentUser} from '../actions/authActions';
import SignUp from '../Components/SignUp';
import setAuthToken from '../util/setAuthToken';
import AboutUs from '../containers/AboutUs';
import store from '../store';
import {connect} from "react-redux";
// check for TOKEN
if (localStorage.jwtToken) {
  // Set auth token header auth
  setAuthToken(localStorage.jwtToken);
  // Decode token and get user info and exp
  const decoded = jwt_decode(localStorage.jwtToken);
  // Set user and …

我的数据库具有这种类型的结构。我想查找“ JAN”数组包含的文档数。我正在尝试以不同的方式进行操作，但是没有任何效果。如果有人帮助的话，那会很棒。

 {
            "_id" : ObjectId("5cd8609db20663a19e2c362c"),
            "2017" : {
                "JAN" : [
                    {
                        "SYMBOL" : "20MICRONS",
                        "SERIES" : "EQ",
                        "OPEN" : "33.4",
                        "HIGH" : "34.3",
                        "LOW" : "33",
                    },
                    {
                        "SYMBOL" : "3IINFOTECH",
                        "SERIES" : "EQ",
                        "OPEN" : "5.8",
                        "HIGH" : "5.8",
                        "LOW" : "5.55",
                    },
                    {
                        "SYMBOL" : "3MINDIA",
                        "SERIES" : "EQ",
                        "OPEN" : "11199.9",
                        "HIGH" : "11233",
                        "LOW" : "10861",
                    }
                ]
            }
        }