<niu-divider > </niu-divider>
<niu-divider > This is a divider </niu-divider>
<niu-divider content-position="center" > text on center </niu-divider>
<niu-divider content-position="right" > text on right </niu-divider>
<niu-divider hidden-preset> text on left </niu-divider>