DOM related method

Method	description	example
new DOMParser() .parseFromString(xx, 'text/html')	透過它來對字串進行解析，進而轉換成 document	const doc = new DOMParser().parseFromString( `<div class="foo bar baz"> Paragraph </div>` ,'text/html');
Node.contains()	return boolean	document.body.contains(node)
		<div id="ele" a="s" b="b"></div> let ele = document.getElementById('ele')
Node.getAttributeNames()	return array 抓所有 att name	ele.getAttributeNames() // ['id', 'a', 'b']
Node.getAttribute('xx')	return string	ele.getAttribute('id') // ele
Node.tageName	return string	ele.tageName // DIV