新建试卷时，在试卷标题处按回车试卷信息就保存了

app/views/exercise/_edit_head.html.erb

@@ -9,4 +9,23 @@
       <a href="javascript:void(0)" onclick="ex_head_submit($(this));" class="fr task-btn mr15 task-btn-blue">保存</a>
       <a href="javascript:void(0)" onclick="ex_head_cancel();" class="fr task-btn mr10">取消</a>
     </p>
-<% end %>
+<% end %>
+
+<script>
+  $(function(){
+      $("#exercise_head_edit").on("keydown", "input[name='exercise[exercise_name]']", function(event){
+          var code;
+          if (!event) {
+              event = window.event; //针对ie浏览器
+              code = event.keyCode;
+          }
+          else {
+              code = event.keyCode;
+          }
+          if(code == 13) {
+              event.preventDefault();
+              return false;
+          }
+      });
+  });
+</script>