fix:更新已知bug,优化代码

app/admin/view/tpl/show_tpl.html

@@ -30,8 +30,8 @@
 
 <script>
     layui.use(['layer','jquery'],function(){
-        var $ = layui.jquery;
-        var layer = layui.layer;
+        let $ = layui.jquery;
+        let layer = layui.layer;
    
         // 提交数据
         $('.editTpl').on('click',function(){