首现看这个错误的名称，第九行的导入应该在相关导入之前，这行代码是
import { HashRouter as Router, Switch, Redirect, Route } from 'react-router-dom';
修改方式，将改行代码放在导入react代码后面也是第二行：
import React, { Component } from 'react';
import { HashRouter as Router, Switch, Redirect, Route } from 'react-router-dom';
我在这两行中间添加其他资源，就报这个错了，无语