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我在尝试将无状态组件导入到我的App.js中以运行时收到错误type is invalid
。当我在App.js中运行相同的代码时,它工作得很好,但是当我导入它时,它会中断。这里有什么解决方案,发生了什么?react.js无状态组件导入时出现“无效”错误
预先感谢您
我mobile.js
import React from 'react';
//this part will be imported via a component. Need to check and make sure how to update state via component.
const checkIfMobile = {
Android: function() {
return navigator.userAgent.match(/Android/i);
},
BlackBerry: function() {
return navigator.userAgent.match(/BlackBerry/i);
},
iOS: function() {
return navigator.userAgent.match(/iPhone|iPad|iPod/i);
},
Opera: function() {
return navigator.userAgent.match(/Opera Mini/i);
},
Windows: function() {
return navigator.userAgent.match(/IEMobile/i);
},
any: function() {
return (
checkIfMobile.Android() ||
checkIfMobile.BlackBerry() ||
checkIfMobile.iOS() ||
checkIfMobile.Opera() ||
checkIfMobile.Windows()
);
}
};
export default checkIfMobile;
这是导入App.js,给我的type is invalid
错误。
import React, { Component } from 'react';
import ChromePluginNotice from '../components/banner/ChromePluginNotice';
import Content from './Content';
import Banner from './Banner';
import Footer from '../components/footer/Footer';
import checkIfMobile from '../components/banner/checks/mobile';
// //this part will be imported via a component. Need to check and make sure how to update state via component.
// const checkIfMobile = {
// Android: function() {
// return navigator.userAgent.match(/Android/i);
// },
// BlackBerry: function() {
// return navigator.userAgent.match(/BlackBerry/i);
// },
// iOS: function() {
// return navigator.userAgent.match(/iPhone|iPad|iPod/i);
// },
// Opera: function() {
// return navigator.userAgent.match(/Opera Mini/i);
// },
// Windows: function() {
// return navigator.userAgent.match(/IEMobile/i);
// },
// any: function() {
// return (
// checkIfMobile.Android() ||
// checkIfMobile.BlackBerry() ||
// checkIfMobile.iOS() ||
// checkIfMobile.Opera() ||
// checkIfMobile.Windows()
// );
// }
// };
export default class App extends Component {
constructor() {
super();
this.state = { isMobile: checkIfMobile.any() };
}
render() {
const { isMobile } = this.state; // destructure isMobile to variable
return (
<div>
<ChromePluginNotice />
<Banner isMobile={isMobile} />
<Content isMobile={isMobile} />
<Footer />
</div>
);
}
}
不知道该怎么办,从这里修复它。完整的错误是
invariant.js?4599:44 Uncaught Error: Element type is invalid: expected a string (for built-in components) or a class/function (for composite components) but got: object. Check the render method of
StatelessComponent .
你能否包含完整的错误? –
更新了我的线程,但是在这里它是'invariant.js?4599:44未捕获的错误:元素类型无效:期望一个字符串(对于内置组件)或类/函数(对于复合组件),但得到:object。检查'StatelessComponent'的渲染方法.' – sthig
我在这里看不到任何无状态的组件... –