Javascript 如何从React组件中的另一个文件调用函数
我想从React组件调用函数。此函数将调用从中调用它的组件中的另一个函数 我的组成部分:Javascript 如何从React组件中的另一个文件调用函数,javascript,reactjs,Javascript,Reactjs,我想从React组件调用函数。此函数将调用从中调用它的组件中的另一个函数 我的组成部分: import React, { useState } from "react"; // import turnOnGreenLight from "./green.js"; // <-- I want to import this export const initialLightValues = ["unactive", "unactive"]; export let setLightsVar
import React, { useState } from "react";
// import turnOnGreenLight from "./green.js"; // <-- I want to import this
export const initialLightValues = ["unactive", "unactive"];
export let setLightsVar = initialLightValues;
function App() {
const [lights, setLights] = useState(initialLightValues);
function turnOnRedLight() {
setLightsVar[0] = "active";
updateLightsState();
turnOnGreenLight();
}
// I want to move this function "turnOnGreenLight" in the file green.js
function turnOnGreenLight() {
setLightsVar[1] = "active";
updateLightsState();
}
function updateLightsState() {
setLightsVar = setLightsVar.slice();
setLights(setLightsVar);
}
return (
<div className="App">
<button onClick={() => turnOnRedLight()}>Turn on the lights</button>
<br />
<div className={"red-light " + lights[0]}>Red</div>
<div className={"green-light " + lights[1]}>Green</div>
</div>
)
}
export default App
我不确定我尝试做的是否可行。这是可能的,但您将得到循环模块警告,如果您将运行jest测试,它将抛出异常,因此如果您想这样做,最好将函数updateLightsState作为回调参数传递,那么没有问题
function turnOnGreenLight(callback) {
setLightsVar[1] = "active";
callback();
}
turnOnGreenLight(updateLightsState)
很抱歉,我无法理解如何将函数updateLightsState作为回调参数传递。
function turnOnGreenLight(callback) {
setLightsVar[1] = "active";
callback();
}
turnOnGreenLight(updateLightsState)