NonDocumentTypeChildNode.previousElementSibling
Baseline
Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since 2015年7月.
概述
previousElementSibling 返回当前元素在其父元素的子元素节点中的前一个元素节点，如果该元素已经是第一个元素节点，则返回 null, 该属性是只读的。
语法
var prevNode = elementNodeReference.previousElementSibling;
例子
html
<div id="div-01">Here is div-01</div>
<div id="div-02">Here is div-02</div>
<li>This is a list item</li>
<li>This is another list item</li>
<div id="div-03">Here is div-03</div>
<script type="text/javascript">
var el = document.getElementById("div-03").previousElementSibling;
document.write("<p>Siblings of div-03</p><ol>");
while (el) {
document.write("<li>" + el.nodeName + "</li>");
el = el.previousElementSibling;
}
document.write("</ol>");
</script>
上面的例子会输出以下内容：
Siblings of div-03 1. LI 2. LI 3. DIV 4. DIV
浏览器兼容性
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