jsDOM如何同时选中几个节点

Question

比如说同时选中table标签下的thead与tbody

Answer 1

<h3> h3 元素</h3>

<h2> h2 元素</h2>

<script>

  var eles = document.querySelectorAll("h2, h3");

  var length = eles.length;

  for(var i=0; i<length; i++) {

      eles[i].style.background = 'red';

  }

</script>