[bug] 表单下拉带出信息清除

src/views/packManagement/modules/BatchInvoicingModule.vue

@@ -283,18 +283,28 @@ export default {
      */
     postContactChange(value) {
       console.log(value)
-      getContactsById({ id: value }).then(res => {
-        let obj = {
-          postalCode: res.result.postalCode,
-          contactAddress: res.result.contactAddress
-        }
-        if (this.packContactId) {
-          this.packContact = obj
-          this.packContact.contactId = value
-        } else {
-          this.form.setFieldsValue(pick(obj, 'postalCode', 'contactAddress'))
-        }
-      })
+      // value不为undefined
+      if (value) {
+        getContactsById({ id: value }).then(res => {
+          let obj = {
+            postalCode: res.result.postalCode,
+            contactAddress: res.result.contactAddress
+          }
+          if (this.packContactId) {
+            this.packContact = obj
+            this.packContact.contactId = value
+          } else {
+            this.form.setFieldsValue(pick(obj, 'postalCode', 'contactAddress'))
+          }
+        })
+        return
+      }
+      // value为undefined，清除邮政编码和通讯地址
+      const obj = {
+        postalCode: undefined,
+        contactAddress: undefined
+      }
+      this.form.setFieldsValue(pick(obj, 'postalCode', 'contactAddress'))
     },
     /**
      * 清空本次开票金额