当前行为
使用react-native-tab-view v1.0.0时,出现错误:
Invariant Violation: Invariant Violation: Element type is invalid: expected a string (for built-in components) or a class/function (for composite components) but got: undefined. You likely forgot to export your component from the file it's defined in, o
当我尝试运行yarn ios时,我得到: Element type is invalid: expected a string (for built-in components) or a class/function (for composite components) but got: undefined. You likely forgot to export your component from the file it's defined in, or you might have mixed up default and named imports.
Check the
我在浏览器控制台中收到一些错误
Warning: Element: `ref` is not a prop. Trying to access it will result in `undefined` being returned. If you need to access the same value within the child component, you should pass it as a different prop.
Warning: Element: `key` is not a prop. Trying to access it will result in `
我正在使用react和npm组件包创建一个chrome扩展。我试图在页面上显示一条错误消息。当我触发错误消息组件时,我得到了一个错误。
这是错误:-
Error: Minified React error #130; visit https://reactjs.org/docs/error-decoder.html?invariant=130&args[]=undefined&args[]= for the full message or use the non-minified dev environment for full errors and additional he
我有一个React类,我们称它为A。我正在对它运行一个jest测试,但我一直收到
Invariant Violation: Element type is invalid: expected a string (for built-in components) or a class/function (for composite components) but got: object.
在我正在做的React类中:export class A extends Component ..
在我正在执行的jest测试文件中:import { A } from './A.js'
当我运
我有一个返回JSX的函数,如下所示:
function struct(locals) {
return (
<View style={fieldsetStyle}>
{label}
{error}
{rows}
</View>
);
}
label, error, and rows are functions that also return JSX.
我在ES6类组件的呈现方法中调用此函数
class Component extends React.Component {
所以我尝试redux和react,我一直在模拟器中得到这个错误
Element type is invalid: expected a string (for built-in components) or a class/function (for composite components) but got: undefined.
和
Warning: React.createElement: type is invalid -- expected a string (for built-in components) or a class/function (for composite c
import React from 'react';
import ReactDOM from 'react-dom';
import Map from './components/map/container/map';
import App from './App';
import './index.css';
import shell from './shared/utility/shell';
import { render } from 'react-dom'
import
我知道这个问题已经被问了很多次了,但是我读到的解决方案在我的案例中行不通。我的代码非常简单明了:
// Import a library to help create a component
import React from 'react';
import { AppRegistry, Text } from 'react-native';
//Only access text and AppRegistry from React-native lib
//Create a component
const App = () => (
<
我已经在网上搜索过了。create元素作为字符串而不是对象调用,感谢您的帮助
这是代码
export function createElement(tag: string, props?: any, ...children: JSX.Element[]){
let el = "<"+tag+">";
if(props != undefined){
for(let i of children){
if(i == undefined)
throw new Error(&
我正在尝试使用我使用react-boilerplate在一个简单的React应用程序中创建的模块。我正在导入模块,但是它说模块中的moment是未定义的。
这里是错误和记录的时刻,只是为了表明this.props.date确实返回了时刻。
Moment {_isAMomentObject: true, _isUTC: false, _pf: {…}, _locale: Locale, _d:
index.js:23 Uncaught (in promise) TypeError: moment is not a function
at module.exports (index.js
我通过通过npm install --save angular-sweetalert安装了^1.1.2,并试图通过注入:
var app = angular.module('myApp', [
require('angular-sweetalert') // doesn't work
]);
我得到了下面的错误
Uncaught Error: [$injector:modulerr] Failed to instantiate module myApp due to:
Error: [$injector:modulerr] Failed to i
似乎不允许我从react本机元素导入FormInput。
我发现了一个错误:
Invariant Violation: Element type is invalid: expected a string (for built-in components) or a class/function (for composite components) but got: undefined. You likely forgot to export your component from the file it's defined in, or you might have mixed up
错误:元素类型无效:应为字符串(对于内置组件)或类/函数(对于复合组件),但got: undefined。您可能忘记了从定义组件的文件中导出组件,或者您可能混淆了默认导入和命名导入。 检查Application的render方法。 enter code here
import React, { Component } from 'react';
import { View, StatusBar, TouchableOpacity, Image } from 'react-native';
import Camera from 'react-nati