未捕获的错误：引发了跨域错误。 React 无法访问开发中的实际错误对象

Question

新手上路，请多包涵

每次提交区域时，它都会显示此错误：

‘未捕获的错误：引发了跨源错误。 React 无法访问开发中的实际错误对象’

它仅在我按下提交区域按钮时发生，我猜这是在旧状态更改为新状态时发生的。 (this.setState)

创建区域.js

 import React, { Component } from "react";

export default class CreateZone extends Component {
  constructor(props) {
    super(props);
    this.state = {
      zone: {
        name: "",
        zipCode: "",
      },
    };
  }

  updateZone(event) {
    let updated = Object.assign({}, this.state.zone);
    updated[event.target.id] = event.target.value;
    this.setState({
      zone: updated,
    });
  }

  submitZone(event) {
    console.log("SubmitZone: " + JSON.stringify(this.state.zone));
    this.props.onCreate(this.state.zone);
  }

  render() {
    return (
      <div>
        <input
          onChange={this.updateZone.bind(this)}
          className="form-control"
          id="name"
          type="text"
          placeholder="Name"
        />{" "}
        <br />
        <input
          onChange={this.updateZone.bind(this)}
          className="form-control"
          id="zipCode"
          type="text"
          placeholder="Zip Code"
        />{" "}
        <br />
        <input
          onClick={this.submitZone.bind(this)}
          className="btn btn-danger"
          type="submit"
          value="Submit Zone"
        />
      </div>
    );
  }
}

区域.js

 import React, { Component } from "react";
import superagent from "superagent";
import { CreateZone, Zone } from "../presentation";

export default class Zones extends Component {
  constructor(props) {
    super(props);
    this.state = {
      list: [],
    };
  }

  componentDidMount() {
    console.log("componentDidMount");
    superagent
      .get("/api/zone")
      .query(null)
      .set("Accept", "application/json")
      .end((err, response) => {
        if (err) {
          alert("ERROR: " + err);
          return;
        }
        console.log(JSON.stringify(response.body));
        let results = response.body.results;
        this.setState({
          list: results,
        });
      });
  }

  addZone(zone) {
    let updatedZone = Object.assign({}, zone);
    updatedZone["zipCodes"] = updatedZone.zipCode.split(",");
    console.log("ADD ZONE: " + JSON.stringify(updatedZone));

    superagent
      .post("/api/zone")
      .send(updatedZone)
      .set("Accept", "application/json")
      .end((err, response) => {
        if (err) {
          alert("ERROR: " + err.message);
          return;
        }
        console.log("ZONE CREATED: " + JSON.stringify(response));
        let updatedList = Object.assign([], this.state.list);
        updatedList.push(response.result);
        this.setState({
          list: updatedList,
        });
      });
  }

  render() {
    const listItems = this.state.list.map((zone, i) => {
      return (
        <li key={i}>
          {" "}
          <Zone currentZone={zone} />{" "}
        </li>
      );
    });

    return (
      <div>
        <ol>{listItems}</ol>
        <CreateZone onCreate={this.addZone.bind(this)} />
      </div>
    );
  }
}

区域.js

 import React, { Component } from "react";

import styles from "./styles";

export default class Zone extends Component {
  render() {
    const zoneStyle = styles.zone;

    return (
      <div style={zoneStyle.container}>
        <h2 style={zoneStyle.header}>
          <a style={zoneStyle.title} href="#">
            {" "}
            {this.props.currentZone.name}{" "}
          </a>
        </h2>
        <span className="detail"> {this.props.currentZone.zipCodes} </span>{" "}
        <br />
        <span className="detail">
          {" "}
          {this.props.currentZone.numComments} comments{" "}
        </span>
      </div>
    );
  }
}