JS 获取HTML标签内的子节点的方法

document.getElementById("id").childNodes.length

document.getElementById("id").childNodes[n] 

<div id="page_kx" style="text-align: center;" class="tac">

<span class="fy2">1</span>
<a href="#">2</a>
<a href="#">3</a>
<a href="#">4</a>
<a href="#">5</a>
<a href="#">下一页</a>
<a href="#">末页</a>
</div>

<script>
var gor=document.getElementById("page_kx");
var gorL=Number(gor.childNodes.length)-4;
gor.childNodes[gorL].style.margin="0 0 0 20px";
</script>