我在React功能组件中使用React.useRef,在类组件中使用React.useRef之前,我收到一条错误消息,现在我将其更改为React功能组件,并且仍然在下面收到此错误消息。
反应挂钩“ React.useRef”在“ landingPage”函数中调用,该函数既不是React函数组件也不是自定义的React Hook函数
您能否解释一下为什么将功能部件放入后仍收到此消息。这是我的代码
import React from "react";
import Modal from "./Modal";
function landingPage() {
const modalRef = React.useRef();
return (
<div className="landingPage">
<div className="container">
<div className="landingPage__row">
<div className="playvideo-wrapper">
<div className="playvideo-text">See us in action</div>
<div className="playvideo-button" onClick={openModal}>
<p>Play Video</p>
</div>
<Modal ref={modalRef}>
<iframe
src="https://www.youtube.com/embed/SQ8CvT25_Dg?autoplay=1"
frameborder="0"
allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture"
allowfullscreen
></iframe>
</Modal>
</div>
</div>
</div>
</div>
);
}
export default landingPage;
这是我在app.js中的代码
import React, { Component } from "react";
import LandingPage from "./LandingPage";
export default class App extends Component {
render() {
return (
<div className="main">
<LandingPage />
</div>
);
}
}
答案 0 :(得分:8)
反应组件必须以大写字母开头。更改此:
function landingPage() {...
对此:
function LandingPage() {...