All:
Right now, what I want to do is very basic:
Just use the default highlight feature of Solr, and show the result on page.
But strange thing is : I get the highlight string which like "asds < em>keyword</em>", but it was treated as a pure string, in the html: it is wrap in "", I wonder how can I make that treated as tag?
Thanks
UPDATE This update is replaced by UPDATE2
I have figured out myself in a dangerous unsuggested way:
    app.config(function($sceProvider) {
              // Completely disable SCE.  For demonstration purposes only!
              // Do not use in new projects.
              $sceProvider.enabled(false);
            });
//In this way, we can disable that so-called **sanitize**
UPDATE2 Thanks to MatsLindh
Refer to Angular JS shows HTML within the tag
 
     
    