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原理是利用ref在加载完后插入元素
其他前端有趣的例子和坑合集： https://github.com/wqhui/blog
直接预览： https://codepen.io/wqh/pen/YzyrNXB

const child =document.createTextNode("原生dom");
render(){
	<div ref={(nodeElement) => { nodeElement && nodeElement.appendChild(child ) }} />