JSX 组件不呈现状态图

Question

i'm trying to make a list when users selects their fav links onClick ...

Any idea why this doesn't work? it will push values to state.array in console.log but JSX will not render in ul.li

import React, { Component } from "react";

export default class App extends Component {
  constructor(props) {
    super(props);

    this.state = {
      link: {
        name: "",
        type: "",
        size: "",
        tests: []
      },
      tests: ["1", "2", "3", "4"]
    };
  }

  componentDidMount() {
    console.log(this.state);
  }

  onClick = e => {
    const linktests = this.state.link.tests;
    console.log("clicked");

    linktests.push(e.target.innerText);
    console.log("link tests : " + linktests);
  };
  render() {
    const { link, tests } = this.state;
    const linktests = this.state.link.tests;
    return (
      <div>
        <div id="link">
          {linktests.map(stuff => (
            <ul>
              <li> {stuff} </li>
            </ul>
          ))}
        </div>
        <br></br>
        {tests.map(stuff => (
          <ul>
            <li onClick={this.onClick} value={stuff}>
              {stuff}
            </li>
          </ul>
        ))}
      </div>
    );
  }
}

hope someone can help :D <3 thanks

Answer 1

You need to set the new links to the state. Also use concat or slice on the original state array to avoid mutating it directly.

 onClick = e => {
    const linktests = this.state.link.tests.concat();
    console.log("clicked");

    linktests.push(e.target.innerText);
    this.setState({link: { ...this.state.link, tests: linktests});
  };