补充old为空的情况

src/util/contrastData.js

@@ -1,7 +1,12 @@
 //比较对象的值
 export function contrastObj(newval, oldval) {
-  var reg = /^[A-Za-z]+$/;
+  let reg = /^[A-Za-z]+$/;
   for (let newitem in newval) {
+    if (Object.keys(oldval).length == 0) {
+      if (newval[newitem]) {
+        return true
+      }
+    }
     for (let olditem in oldval) {
       if (!reg.test(newitem)) {
         delete newval.newitem