is anyone can tell me that aem 6.4 support angular js
If you want to use SPA editor for an end to end delivery of an angular SPA, you need to be on 6.4.2 or above. Reference at 
If you want angular for any custom functionality, you can embed it as a clientlibs as use it. Reference pattern is available in ACS-Commons at 
 - https://docs.adobe.com/content/help/en/experience-manager-64/developing/headless/spas/spa-overview.h...
 - /apps/acs-commons/clientlibs/vendor/angularjs
Yes it is supported, check https://docs.adobe.com/content/help/en/experience-manager-64/developing/headless/spas/spa-getting-st... for more details.