From c9aaf18a821629cb63a7fafc6dd4faab960a17c2 Mon Sep 17 00:00:00 2001
From: zhl <zhl010101@gmail.com>
Date: Fri, 18 Dec 2020 16:18:38 +0800
Subject: [PATCH] =?UTF-8?q?=E5=A2=9E=E5=8A=A0=E4=B8=80=E4=B8=AA=E7=94=A8?=
 =?UTF-8?q?=E4=BA=8E=E8=B7=9F=E8=B8=AA=E5=AD=97=E6=AE=B5=E5=80=BC=E6=9B=B4?=
 =?UTF-8?q?=E6=96=B0=E7=9A=84decorator?=
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---
 src/decorators/debug.decorator.ts | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)
 create mode 100644 src/decorators/debug.decorator.ts

diff --git a/src/decorators/debug.decorator.ts b/src/decorators/debug.decorator.ts
new file mode 100644
index 0000000..0472431
--- /dev/null
+++ b/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
+        })
+    }
+
+}