javascript - 我如何在 react 中使用另一个文件中的函数？

Question

我想为执行此操作的函数创建一个文件 (function.js):

let i = 0;
    if (this === that) {
        i = 0;
    } else {
       i = 1;
    }

然后我想将它添加到 (this.js)

import function from "./function";
class Example extends Component {
    state = {
        test
    };
    render() {
        function()
    return (
        <div>
            <h1>{this.state.test.sample[i].name}</h1>
        </div>

Answer 1

你可以这样做:

函数.js

const doSomething = function() {
let i = 0;
    if (this === that) {
        i = 0;
    } else {
       i = 1;
    }

}

export default doSomething;

App.js(例如):

import doSomething from "./function";

class Example extends Component {
    state = {
        test
    };
    render() {
        doSomething()
    return (
        <div>
            <h1>{this.state.test.sample[i].name}</h1>
        </div>
     )