增加广告跳转，增加现金红包配置

src/utils/validate.js

@@ -29,3 +29,7 @@ export function isPhone (s) {
 export function isURL (s) {
   return /^http[s]?:\/\/.*/.test(s)
 }
+
+export function isNull(val){
+  return val === null || val === undefined||val === '';
+}