带有 React 的随机背景图片

Question

我实际上正在开发 React 应用程序，目前正在尝试显示随机背景图片。我的想法是导入 4 张图片，将它们放入一个数组中，然后 select 随机选择数组中的一项：

import skyPicture1 from '../assets/pictures/sky.jpg'
import skyPicture2 from '../assets/pictures/sky2.jpg'
import skyPicture3 from '../assets/pictures/sky3.jpg'
import skyPicture4 from '../assets/pictures/sky4.png'


class HomeForUnlogged extends Component {


  constructor(props) {
    super(props)

    this.state = {
      bgStyle : {
        height: "100%",
        backgroundPosition: "center",
        backgroundRepeat: "no-repeat",
        backgroundSize: "cover",
      }
    }
  }


  componentWillMount() {

    const pictureArray = [{skyPicture1}, {skyPicture2}, {skyPicture3}, {skyPicture4}];
    const randomIndex = Math.floor(Math.random() * pictureArray.length);
    const selectedPicture = pictureArray[randomIndex];

    this.setState({
      bgStyle: {
        backgroundImage: `url(${selectedPicture})`,
        height: "100%",
        backgroundPosition: "center",
        backgroundRepeat: "no-repeat",
        backgroundSize: "cover",
      }
    })

  }


  render() {

    return (
      < div style={this.state.bgStyle} className="bg">
        <div className="row" >
          <div className="col-sm-4" style={{ marginTop: "30px", padding: "30px" }} > <TextHome /></div>
          <div className="col-sm-4" style={{ marginTop: "90px", padding: "30px" }}> <Login history={this.props.history} /></div>
          <div className="col-sm-4"> </div>
        </div>
      </div>
    );
  }
}

export default HomeForUnlogged;

但是根本没有显示图片。有谁知道我做错了什么？我不知道。

Answer 1

你把它做成object，可以改成const pictureArray = [skyPicture1, skyPicture2, skyPicture3, skyPicture4];

带有 React 的随机背景图片

Random background image with React

css

background-image

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