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並前往http://nkidtw-program.blogspot.com/2012/11/firstchild-vs-firstelementchild.html

firstChild vs firstElementChild - NKid's 預防痴呆筆記本

The first child node and the first child element can be different. A node is an element node if it's nodeType is 1 (Node.ELEMENT_NODE).

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