关卡详情页面参数修改

app/views/challenges/show.json.jbuilder

@@ -1,6 +1,6 @@
 # 导航栏公共数据
 json.partial! "challenges/top_common_data", shixun_identifier: @shixun.identifier
-json.(@challenge, :id, :subject, :task_pass, :difficulty, :score)
+json.(@challenge, :id, :subject, :task_pass, :difficulty, :score, :exec_time)
 json.tags @challenge.challenge_tags.map(&:name)