x
1
<span class=" d d e f"></span>2
<script>3
var span = document.querySelector("span");4
var classes = span.classList;5
span.classList.add("x");6
span.textContent = 'span 的 classList 是 "' + classes + '"';7
</script>8
<span class=" d d e f"></span><script>var span = document.querySelector("span");var classes = span.classList;span.classList.add("x");span.textContent = 'span 的 classList 是 "' + classes + '"';</script>