ReactJS：有更好的方法吗？

Question

Basically, on hover i am changing the text color of a link, I was able to achieve what i needed, however, this looks too much of code for me, I believe there should be a better way. I am wondering if there is a better logic than this. Please suggest.

class App extends React.Component {
  constructor() {
    super();
    this.state = {
      link_su: false,
      link_si: false
    };
  }

  componentDidMount() {
    this.hover_signup = document.getElementById("signup");
    this.hover_signin = document.getElementById("signin");

    this.hover_signup.addEventListener("mouseenter", this.colorChange);
    this.hover_signup.addEventListener("mouseleave", this._colorChange);

    this.hover_signin.addEventListener("mouseenter", this.colorChange);
    this.hover_signin.addEventListener("mouseleave", this._colorChange);
  }

  componentWillUnmount() {
    //removing all event listeners.
  }

  colorChange = e => {
    if (e.target.id == "signup") {
      this.setState({ link_su: !this.state.link });
    } else {
      this.setState({ link_si: !this.state.link });
    }
  };

  _colorChange = e => {
    if (e.target.id == "signup") {
      this.setState({ link_su: this.state.link });
    } else {
      this.setState({ link_si: this.state.link });
    }
  };

  render() {
    return (
      <main role="main" className="inner cover">
        <a
          href="/signup"
          className="btn btn-lg btn-secondary"
          style={link_su ? { color: "white" } : { color: "#282c34" }}
          id="signup"
        >
          Sign Up
        </a>
        <br />
        <br />
        <a
          href="/signin"
          className="btn btn-lg btn-secondary"
          style={link_si ? { color: "white" } : { color: "#282c34" }}
          id="signin"
        >
          Sign In
        </a>
      </main>
    );
  }
}

Answer 1

Yes there is an easier way, this can all be done with CSS using the :hover selector.

For example:

 a { color: blue; } a.link1:hover { color: red; } a.link2:hover { color: yellow; } 

 <a class="link1" href="">Link 1</a> <a class="link2" href="">Link 2</a> 

Edit :

If you use the style property to apply styles, I believe nothing (except !important properties) can override that style, so if you provide the initial color through style but the hover color in a stylesheet, then the hover color will be overridden by the initial style and not show up. So it's best not to mix in-line and stylesheet styles.

Here's an example of what happens:

 a.link1:hover { color: red; } a.link2:hover { color: red !important; } 

 <a class="link1" style="color: blue;" href="">Always Blue</a> <a class="link2" style="color: blue;" href="">Using Important (but you shouldn't)</a> 

Note: I'm really not recommending using the !important flag here, instead I'm recommending removing the in-line styles.