班级作业“从题库引用”作业，有时如图作业描述框中会出现一大片空白

app/views/users/user_select_homework.js.erb

@@ -1,5 +1,6 @@
 //$("#HomeWorkCon").replaceWith("<%#= escape_javascript(render :partial => 'users/user_homework_form', :locals => { :homework => @homework,:edit_mode => true })%>");
 hideModal('#coursesChoosePopup');
+$("#homework_editor").show();
 $("#homework_name").val("<%= @homework.name%>");
 //$("#homework_end_time").val("<%#= @homework.end_time%>");
 <% if @select_course == "0"%>
@@ -20,6 +21,5 @@ homework_description_editor.html("<%= escape_javascript(@homework.description.ht
 <% end %>
 document.getElementById("homework_type_option").options[<%=@homework.homework_type %>].selected = true;
 $("#select_type_nitice").hide();
-$("#homework_editor").show();
 $("#join_bank").attr("checked",false);
 $("#join_bank_li").hide();