优化后台参数消失引起的bug

@@ -185,21 +185,25 @@ Page({
       var btn_show = this.data.btn_show
       if (that.data.cur_status == "continuing_education") {
         var professionlist = newdata[0].profession_items
-        for (var i = 0; i < professionlist.length > 0; i++) {
-          if (professionlist[i].approval_date) {
-            professionlist[i].approval_date = this.formatDate(professionlist[i].approval_date)
+        if (professionlist && professionlist.length>0){
+          for (var i = 0; i < professionlist.length > 0; i++) {
+            if (professionlist[i].approval_date) {
+              professionlist[i].approval_date = this.formatDate(professionlist[i].approval_date)
+            }
           }
         }
         var titlelist = newdata[0].title_items
-        for (var i = 0; i < titlelist.length > 0; i++) {
-          if (titlelist[i].education_start) {
-            titlelist[i].education_start = this.formatDate(titlelist[i].education_start).substring(0, 7)
-          }
-          if (titlelist[i].education_end) {
-            titlelist[i].education_end = this.formatDate(titlelist[i].education_end).substring(0, 7)
+        if(titlelist&&titlelist.length>0){
+          for (var i = 0; i < titlelist.length > 0; i++) {
+            if (titlelist[i].education_start) {
+              titlelist[i].education_start = this.formatDate(titlelist[i].education_start).substring(0, 7)
+            }
+            if (titlelist[i].education_end) {
+              titlelist[i].education_end = this.formatDate(titlelist[i].education_end).substring(0, 7)
+            }
           }
         }
-          btn_show = true
+        btn_show = true
         // this.setData({
         //   issinglechildData: issinglechild_Data,
         //   shareMethodData: shareMethod_Data