要求：
- 获得下一个/上一个兄弟元素节点，不包括文本节点等
- 解决IE兼容性问题
代码实现：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<div>div</div>
<span>span</span>
<script>
function getNextElement(element) {
var el = element;
while (el = el.nextSibling) {
if (el.nodeType === 1) {
return el;
}
}
return null;
}
function getPrevElement(element) {
var el = element;
while (el = el.previousSibling) {
if (el.nodeType === 1) {
return el;
}
}
return null;
}
var div = document.querySelector('div');
var span = document.querySelector('span');
console.log(getNextElement(div));
console.log(getPrevElement(span));
</script>
</body>
</html>
实现效果：
