javascript - 我如何在 React 的不同文件中使用一个函数？

Question

我正在尝试使用一个函数，它位于与 App.js 不同的组件中。而且我有语法错误，我不知道我做错了什么。我在 App.js 中有一个按钮，当我点击它时，我之前提到的另一个组件的功能应该会触发。

app.js:

import React from 'react';
import {shaking} from './components/Tree/Tree.js';

class App extends React.Component {
    constructor() {
        super();
        this.handleClick = this.handleClick.bind(this);
    }

    handleClick() {
        shaking();
        console.log("done !");
    }

    render() {
        return (
            <div>
                <Tree className='tree' />
                <Apples />
                <Basket />
                <br/>
                <button className="start-btn" onClick={this.handleClick}>Start !</button>
                <br/>
            </div>
        );
    }
};

export default App;

这是我的另一个组件:

import React from 'react';
import TreeSvg from './Tree-svg/TreeSvg.js';
import './Tree.sass';

export  function shaking(){
    const tree = document.getElemenetsByClassName(".tree-img")[0];
    tree.classList.add("apply-shake");
    console.log('shaked!');
}

class Tree extends React.Component{
    constructor() {
    super();
        this.shaking = this.shaking.bind(this);
    }

    shaking() {
        this.setState({shaked:'1'});
        const tree = document.getElemenetByClassName(".tree-img");
        tree.classList.add("apply-shake");
        console.log('shaked!');
    }

    render(){
        return(
            <div className="tree-img">
            <TreeSvg />
            </div>
        );
    }
};

export default Tree;

Answer 1

像这样制作你的树组件

import React from 'react';
import TreeSvg from './Tree-svg/TreeSvg.js';
import './Tree.sass';

export  function shaking(){
    const tree = document.getElementsByClassName(".tree-img")[0];
    tree.classList.add("apply-shake");
    console.log('shaked!');
}



class Tree extends React.Component{
    constructor() {
    super();
    this.state = {
        shaked : ''
    }
shaking() {
    this.setState({shaked:'1'});
    const tree = document.getElementByClassName(".tree-img");
    tree.classList.add("apply-shake");
    console.log('shaked!');
    }
render(){
return(
    <div className="tree-img">
    <TreeSvg />
    </div>
 );
}
};


export default Tree;