fix upload

src/views/home/component/params/params1.vue

@@ -341,7 +341,11 @@ export default {
       })
     },
     changeDate(res) {
-      this.form.construction_start_and_end = res.join(',')
+      if (res) {
+        this.form.construction_start_and_end = res.join(',')
+      } else {
+        this.form.construction_start_and_end = ''
+      }
     }
   }
 }