优化Flags

demo/libs/framework/framework.d.ts

@@ -503,10 +503,10 @@ declare class Time {
 declare class Flags {
     static isFlagSet(self: number, flag: number): boolean;
     static isUnshiftedFlagSet(self: number, flag: number): boolean;
-    static setFlagExclusive(self: number, flag: number): void;
-    static setFlag(self: number, flag: number): void;
-    static unsetFlag(self: number, flag: number): void;
-    static invertFlags(self: number): void;
+    static setFlagExclusive(self: number, flag: number): number;
+    static setFlag(self: number, flag: number): number;
+    static unsetFlag(self: number, flag: number): number;
+    static invertFlags(self: number): number;
 }
 declare class MathHelper {
     static toDegrees(radians: number): number;

demo/libs/framework/framework.js

@@ -2347,17 +2347,17 @@ var Flags = (function () {
         return (self & flag) != 0;
     };
     Flags.setFlagExclusive = function (self, flag) {
-        self = 1 << flag;
+        return 1 << flag;
     };
     Flags.setFlag = function (self, flag) {
-        self = (self | 1 << flag);
+        return (self | 1 << flag);
     };
     Flags.unsetFlag = function (self, flag) {
         flag = 1 << flag;
-        self = (self & (~flag));
+        return (self & (~flag));
     };
     Flags.invertFlags = function (self) {
-        self = ~self;
+        return ~self;
     };
     return Flags;
 }());