index.js

import React, { Component } from "react"
import "./index.scss"

class Selection extends Component {
  state = {
    screenshots: [
      "https://cdn.julyedu.com/mlCourse/m/exercise_1.png",
      "https://cdn.julyedu.com/mlCourse/m/exercise_2.png",
      "https://cdn.julyedu.com/mlCourse/m/exercise_3.png",
    ],
  }

  render() {
    return (
      <div id={"selection"}>
        <h2>精 / 选 / 习 / 题</h2>
        <ul>
          {this.state.screenshots.map((item, i) => {
            return (
              <li key={i}>
                <img src={item} alt="" />
              </li>
            )
          })}
        </ul>
      </div>
    )
  }
}

export default Selection