Reactjs 无法启动Resact simple app I get错误:元素类型无效:应为字符串
我是新来的反应,发现了这个 我无法让它工作我已经创建了一个演示照片,如下所示:Reactjs 无法启动Resact simple app I get错误:元素类型无效:应为字符串,reactjs,visual-studio-code,Reactjs,Visual Studio Code,我是新来的反应,发现了这个 我无法让它工作我已经创建了一个演示照片,如下所示: import React from "react"; import ReactDOM from "react-dom"; import PhotoGrid from "react-photo-feed"; import "react-photo-feed/library/style.css"; const demoPhotos = [
import React from "react";
import ReactDOM from "react-dom";
import PhotoGrid from "react-photo-feed";
import "react-photo-feed/library/style.css";
const demoPhotos = [
{
id : 1, src : "https://farm5.staticflickr.com/4077/34824083444_f5f050e31c_n.jpg",
bigSrc : "https://farm5.staticflickr.com/4077/34824083444_f5f050e31c_b.jpg"
},
{
id : 2, src : "https://farm5.staticflickr.com/4240/35527849422_25a0a67df6_n.jpg",
bigSrc : "https://farm5.staticflickr.com/4240/35527849422_25a0a67df6_b.jpg"
},
{
id : 3, src : "https://farm5.staticflickr.com/4077/34824083444_f5f050e31c_n.jpg",
bigSrc : "https://farm5.staticflickr.com/4077/34824083444_f5f050e31c_b.jpg"
},
{
id : 4, src : "https://farm5.staticflickr.com/4240/35527849422_25a0a67df6_n.jpg",
bigSrc : "https://farm5.staticflickr.com/4240/35527849422_25a0a67df6_b.jpg"
},
{
id : 5, src : "https://farm5.staticflickr.com/4077/34824083444_f5f050e31c_n.jpg",
bigSrc : "https://farm5.staticflickr.com/4077/34824083444_f5f050e31c_b.jpg"
},
{
id : 6, src : "https://farm5.staticflickr.com/4240/35527849422_25a0a67df6_n.jpg",
bigSrc : "https://farm5.staticflickr.com/4240/35527849422_25a0a67df6_b.jpg"
},
{
id : 7, src : "https://farm5.staticflickr.com/4077/34824083444_f5f050e31c_n.jpg",
bigSrc : "https://farm5.staticflickr.com/4077/34824083444_f5f050e31c_b.jpg"
}
];
ReactDOM.render(
<div>
<PhotoGrid columns={3} photos={demoPhotos} />
</div>,
document.getElementById('root')
);
从“React”导入React;
从“react dom”导入react dom;
从“react photo feed”导入PhotoGrid;
导入“react photo feed/library/style.css”;
常数demoPhotos=[
{
id:1,src:“https://farm5.staticflickr.com/4077/34824083444_f5f050e31c_n.jpg",
bigSrc:“https://farm5.staticflickr.com/4077/34824083444_f5f050e31c_b.jpg"
},
{
id:2,src:“https://farm5.staticflickr.com/4240/35527849422_25a0a67df6_n.jpg",
bigSrc:“https://farm5.staticflickr.com/4240/35527849422_25a0a67df6_b.jpg"
},
{
id:3,src:“https://farm5.staticflickr.com/4077/34824083444_f5f050e31c_n.jpg",
bigSrc:“https://farm5.staticflickr.com/4077/34824083444_f5f050e31c_b.jpg"
},
{
id:4,src:“https://farm5.staticflickr.com/4240/35527849422_25a0a67df6_n.jpg",
bigSrc:“https://farm5.staticflickr.com/4240/35527849422_25a0a67df6_b.jpg"
},
{
id:5,src:“https://farm5.staticflickr.com/4077/34824083444_f5f050e31c_n.jpg",
bigSrc:“https://farm5.staticflickr.com/4077/34824083444_f5f050e31c_b.jpg"
},
{
id:6,src:“https://farm5.staticflickr.com/4240/35527849422_25a0a67df6_n.jpg",
bigSrc:“https://farm5.staticflickr.com/4240/35527849422_25a0a67df6_b.jpg"
},
{
id:7,src:“https://farm5.staticflickr.com/4077/34824083444_f5f050e31c_n.jpg",
bigSrc:“https://farm5.staticflickr.com/4077/34824083444_f5f050e31c_b.jpg"
}
];
ReactDOM.render(
,
document.getElementById('root'))
);
在我的App.js中:
// src/js/components/App.jsx
import React, { Component } from "react";
import DemoPhotos from "./DemoPhotos.jsx";
class App extends Component {
constructor(props) {
super(props);
this.handleClick = this.handleClick.bind(this);
}
handleClick() {
const { addToast } = this.props.actions;
addToast({ text: "Hello, World!" });
}
render() {
return (
<main>
<div className="row mt-5">
<div className="col-md-4 offset-md-1">
<h2>Add a new article</h2>
<DemoPhotos />
</div>
</div>
</main>
);
}
}
export default App;
//src/js/components/App.jsx
从“React”导入React,{Component};
从“/DemoPhotos.jsx”导入DemoPhotos;
类应用程序扩展组件{
建造师(道具){
超级(道具);
this.handleClick=this.handleClick.bind(this);
}
handleClick(){
const{addToast}=this.props.actions;
addToast({text:“你好,世界!”});
}
render(){
返回(
添加新文章
);
}
}
导出默认应用程序;
当我跑步时,我得到:
×
错误:元素类型无效:应为字符串(对于内置
组件)或类/函数(用于复合组件),但得到:
反对
检查应用程序的渲染方法
问题在于渲染器中的这一行
请建议我喜欢这个foto组件
向埃里克问好
该错误消息明确说明了问题所在。这是因为您没有返回
DemoPhotos.jsx
文件中的字符串或类/函数组件。它不是可渲染的react组件。请更新DemoPhotos.jsx
文件,如下所示
从“React”导入React;
从“react photo feed”导入PhotoGrid;
导入“react photo feed/library/style.css”;
康斯特照片=[
{
id:1,src:“https://farm5.staticflickr.com/4077/34824083444_f5f050e31c_n.jpg",
bigSrc:“https://farm5.staticflickr.com/4077/34824083444_f5f050e31c_b.jpg"
},
{
id:2,src:“https://farm5.staticflickr.com/4240/35527849422_25a0a67df6_n.jpg",
bigSrc:“https://farm5.staticflickr.com/4240/35527849422_25a0a67df6_b.jpg"
},
{
id:3,src:“https://farm5.staticflickr.com/4077/34824083444_f5f050e31c_n.jpg",
bigSrc:“https://farm5.staticflickr.com/4077/34824083444_f5f050e31c_b.jpg"
},
{
id:4,src:“https://farm5.staticflickr.com/4240/35527849422_25a0a67df6_n.jpg",
bigSrc:“https://farm5.staticflickr.com/4240/35527849422_25a0a67df6_b.jpg"
},
{
id:5,src:“https://farm5.staticflickr.com/4077/34824083444_f5f050e31c_n.jpg",
bigSrc:“https://farm5.staticflickr.com/4077/34824083444_f5f050e31c_b.jpg"
},
{
id:6,src:“https://farm5.staticflickr.com/4240/35527849422_25a0a67df6_n.jpg",
bigSrc:“https://farm5.staticflickr.com/4240/35527849422_25a0a67df6_b.jpg"
},
{
id:7,src:“https://farm5.staticflickr.com/4077/34824083444_f5f050e31c_n.jpg",
bigSrc:“https://farm5.staticflickr.com/4077/34824083444_f5f050e31c_b.jpg"
}
];
类扩展组件{
建造师(道具){
超级(道具);
}
render(){
返回(
);
);
导出默认照片;
DemoPhotos.jsx中有什么内容?
import React from "react";
import PhotoGrid from "react-photo-feed";
import "react-photo-feed/library/style.css";
const photos = [
{
id : 1, src : "https://farm5.staticflickr.com/4077/34824083444_f5f050e31c_n.jpg",
bigSrc : "https://farm5.staticflickr.com/4077/34824083444_f5f050e31c_b.jpg"
},
{
id : 2, src : "https://farm5.staticflickr.com/4240/35527849422_25a0a67df6_n.jpg",
bigSrc : "https://farm5.staticflickr.com/4240/35527849422_25a0a67df6_b.jpg"
},
{
id : 3, src : "https://farm5.staticflickr.com/4077/34824083444_f5f050e31c_n.jpg",
bigSrc : "https://farm5.staticflickr.com/4077/34824083444_f5f050e31c_b.jpg"
},
{
id : 4, src : "https://farm5.staticflickr.com/4240/35527849422_25a0a67df6_n.jpg",
bigSrc : "https://farm5.staticflickr.com/4240/35527849422_25a0a67df6_b.jpg"
},
{
id : 5, src : "https://farm5.staticflickr.com/4077/34824083444_f5f050e31c_n.jpg",
bigSrc : "https://farm5.staticflickr.com/4077/34824083444_f5f050e31c_b.jpg"
},
{
id : 6, src : "https://farm5.staticflickr.com/4240/35527849422_25a0a67df6_n.jpg",
bigSrc : "https://farm5.staticflickr.com/4240/35527849422_25a0a67df6_b.jpg"
},
{
id : 7, src : "https://farm5.staticflickr.com/4077/34824083444_f5f050e31c_n.jpg",
bigSrc : "https://farm5.staticflickr.com/4077/34824083444_f5f050e31c_b.jpg"
}
];
class DemoPhotos extends Component {
constructor(props) {
super(props);
}
render() {
return (
<div>
<PhotoGrid columns={3} photos={photos} />
</div>
);
);
export default DemoPhotos;