ReactJS-更改当前页码的颜色

请参见应用程序链接:

https://codepen.io/claudio-bitar/pen/VERORW

我想更改当前页码的颜色。例如,第一页显示,所以我想改变颜色的第一,第二,第二等。。。

代码:

class TodoApp extends React.Component {
  constructor() {
    super();
    this.state = {
      todos: {            
        "elements": ['a','b','c','d','e','f','g','h','i','j','k']          
  },

      currentPage: 1,
      todosPerPage: 3
    };
    this.handleClick = this.handleClick.bind(this);
  }

  handleClick(event) {
    this.setState({
      currentPage: Number(event.target.id)
    });
  }

  render() {
    const { todos, currentPage, todosPerPage } = this.state;

    // Logic for displaying current todos
    const indexOfLastTodo = currentPage * todosPerPage;
    const indexOfFirstTodo = indexOfLastTodo - todosPerPage;
    const currentTodos = todos.elements.slice(indexOfFirstTodo, indexOfLastTodo);

    const renderTodos = currentTodos.map((todo, index) => {
      return <li key={index}>{todo}</li>;
    });

    // Logic for displaying page numbers
    const pageNumbers = [];
    for (let i = 1; i <= Math.ceil(todos.elements.length / todosPerPage); i++) {
      pageNumbers.push(i);
    }

    const renderPageNumbers = pageNumbers.map(number => {
      return (
        <li
          key={number}
          id={number}
          onClick={this.handleClick}
        >
          {number}
        </li>
      );
    });

    return (
      <div>
        <ul>
          {renderTodos}
        </ul>
        <ul id="page-numbers">
          {renderPageNumbers}
        </ul>
      </div>
    );
  }
}


ReactDOM.render(
  <TodoApp />,
  document.getElementById('app')
);