fix issue #748

templates/home.tmpl

@@ -7,7 +7,11 @@
         </div>
         </h1>
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-        <a class="circular ui secondary button" href="{{AppSubUrl}}/user/sign_up">立即使用 <i class="right arrow icon"></i></a>
+        {{if .IsSigned}}
+        <a class="circular ui secondary button" href="{{AppSubUrl}}/dashboard">立即使用 <i class="right arrow icon"></i></a>
+        {{else}}
+        <a class="circular ui secondary button" href="{{AppSubUrl}}/user/login">立即使用 <i class="right arrow icon"></i></a>
+        {{end}}
         <div class="bannerpic"><img class="ui fluid image" src="/img/gitopeni-index-01.svg"></div>
     </div>
 </div><!-- end segment -->