Different between <a> and <button> button, ng-click & ui-sref

different-a-button.md

• Same: use class="button"
• Always try to using ui-sref first, just using ng-click if need to do something (not moving state) or change states dynamic (ui-sref doesn't support it)
• Different:

	<a>	<button>
change state/url	use ui-sref="" (no need create more functions, short code if just change state/url and not more complex code) or ng-click="changeUrl()" (use same <button>)	only way using ng-click="changeUrl()" with $scope.changeUrl = function() { $state.go('tab.posts', {postId: postId});}
use ng-click	no effect	having effect. side effect: submit form automatically