eloquent js chapter 13 dom ex2 elem tag name

by Aswin Devarajan

HTML

<h1>Heading with a <span>span</span> element.</h1>
<p>A paragraph with <span>one</span>, <span>two</span>
  spans.</p>

JavaScript

function byTagName(node, tagName){
	var test = node.querySelectorAll(tagName);
  console.log(test);
  return test
}

console.log(byTagName(document.body, 'span').length);
console.log(byTagName(document.body, 'h1').length);
var para = document.querySelector('p');
console.log(byTagName(para, 'span').length);