[英]Unexpected token '<' when trying to load my webcomponent in html
所以我试图创建一个反应 web 组件。 我将它包装起来,在 VSCode 上看起来不错,但是当我尝试加载它时,它给了我错误:行上出现意外的标记“<”:
ReactDOM.render(<Counter/>, mountPoint);
有谁知道为什么以及如何解决它? 谢谢
这是我的网络组件:
import React from 'react';
import * as ReactDOM from 'react-dom';
import Counter from './counter';
class CounterWC extends HTMLElement {
connectedCallback() {
// Create a ShadowDOM
const root = this.attachShadow({ mode: 'open' });
// Create a mount element
const mountPoint = document.createElement('div');
root.appendChild(mountPoint);
// You can directly use shadow root as a mount point
ReactDOM.render(<Counter/>, mountPoint);
}
}
customElements.define('counter-wc', CounterWC)
这是我的 html:
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-9" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Document</title>
</head>
<body>
<h1>React webcomponent:</h1>
<counter-wc></counter-wc>
<script type="module" src="./counterWC.js"></script>
</body>
</html>
回复:评论
您将文件命名为 *.js 并不意味着它是JavaScript
ReactDOM.render(<Counter/>, mountPoint);
是 JSX,不是JavaScript,它需要在构建步骤中转换为 JavaScript。
或者根本不使用 React:
class CounterWC extends HTMLElement { constructor(){ super().attachShadow({mode: 'open'}).append(this.div = document.createElement('div')); } connectedCallback() { this.div.innerHTML = `Am I a counter?`; } } customElements.define('counter-wc', CounterWC);
<counter-wc></counter-wc>
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