nodeType属性返回被选节点的节点类型介绍
节点编号： 节点名称：
1 Element
2 Attribute
3 Text
4 CDATA Section
5 Entity Reference
6 Entity
7 Processing Instrucion
8 Comment
9 Document
10 Document Type
11 Document Fragment
12 Notation
1 Element
2 Attribute
3 Text
4 CDATA Section
5 Entity Reference
6 Entity
7 Processing Instrucion
8 Comment
9 Document
10 Document Type
11 Document Fragment
12 Notation
