JSFiddle - React, Tailwind, and code Playground

JavaScript

var html = `<!doctype html>
<html>
<head><title></title></head>
<div id="hi">讀這個</div></html>`; //比如整個是html代碼

get2(html,"hi");


function get2(html, id) {
	var doc = new DOMParser().parseFromString(unescape(html), "text/html");
	alert(doc.getElementById(id).innerHTML);//.getElementById
}