增加一个用于跟踪字段值更新的decorator

src/decorators/debug.decorator.ts

@@ -0,0 +1,22 @@
+/**
+ * 用于跟踪class某property的值变化
+ * 使用方法:
+ * 在需要跟踪的字段上加上 @trace
+ */
+export function trace() {
+    return function (target: any, name: string) {
+        let val = target[name];
+        const setter = function (valNew: any) {
+            console.trace(`${target.constructor.name}.${name} set val: ${valNew}`);
+            val = valNew;
+        }
+        const getter = function () {
+            return val;
+        }
+        Reflect.defineProperty(target, name, {
+            get: getter,
+            set: setter
+        })
+    }
+
+}