func NewNodeChanFilter(text <-chan string) DirtyFilter {
	nf := &nodeFilter{
		root: newNode(),
	}
	for v := range text {
		nf.addDirtyWords(v)
	}
	return nf
}
func NewNodeChanFilter(text <-chan string) DirtyFilter {
	nf := &nodeFilter{
		root: newNode(),
	}
	for v := range text {
		nf.addDirtyWords(v)
	}
	return nf
}
// NewNodeChanFilter 创建节点过滤器，实现敏感词的过滤
// 从通道中读取敏感词数据