If the target node has no name, because it is a document node, a comment, or a text node, the function returns the zero-length string.是什么意思_If the target node has no name, because it is a document node, a comment, or a text node, the function returns the zero-length string.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句