update 优化 R 默认返回 msg

ruoyi-common/src/main/java/com/ruoyi/common/core/domain/R.java

@@ -38,11 +38,11 @@ public class R<T> implements Serializable {
     private T data;
 
     public static <T> R<T> ok() {
-        return restResult(null, SUCCESS, null);
+        return restResult(null, SUCCESS, "操作成功");
     }
 
     public static <T> R<T> ok(T data) {
-        return restResult(data, SUCCESS, null);
+        return restResult(data, SUCCESS, "操作成功");
     }
 
     public static <T> R<T> ok(String msg) {
@@ -54,7 +54,7 @@ public class R<T> implements Serializable {
     }
 
     public static <T> R<T> fail() {
-        return restResult(null, FAIL, null);
+        return restResult(null, FAIL, "操作失败");
     }
 
     public static <T> R<T> fail(String msg) {
@@ -62,7 +62,7 @@ public class R<T> implements Serializable {
     }
 
     public static <T> R<T> fail(T data) {
-        return restResult(data, FAIL, null);
+        return restResult(data, FAIL, "操作失败");
     }
 
     public static <T> R<T> fail(String msg, T data) {