1. nextSibing：下一个节点，节点类型可以是任何一种，其中就有文本节点。
2.得到下一个元素节点：
function getNextElement(node){
if(node.nodeType == 1){
return node;
}
if(node.nextSibling){
return getNextElement(node.nextSibling);
}
return null;
}
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