From 95e2e7921914ed8fc1b961a74578b8e1eab413da Mon Sep 17 00:00:00 2001
From: ruanyf <yifeng.ruan@gmail.com>
Date: Sat, 9 Apr 2022 20:38:45 +0800
Subject: [PATCH] =?UTF-8?q?docs(object):=20edit=20=E5=AF=B9=E8=B1=A1?=
 =?UTF-8?q?=E7=9A=84=E6=89=A9=E5=B1=95=E8=BF=90=E7=AE=97=E7=AC=A6?=
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---
 docs/object.md | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/docs/object.md b/docs/object.md
index 15380aa..bd34647 100644
--- a/docs/object.md
+++ b/docs/object.md
@@ -606,6 +606,23 @@ foo
 // {0: "h", 1: "e", 2: "l", 3: "l", 4: "o"}
 ```
 
+对象的扩展运算符，只会返回参数对象自身的、可枚举的属性，这一点要特别小心，尤其是用于类的实例对象时。
+
+```javascript
+class C {
+  p = 12;
+  m() {}
+}
+
+let c = new C();
+let clone = { ...c };
+
+clone.p; // ok
+clone.m(); // 报错
+```
+
+上面示例中，`c`是`C`类的实例对象，对其进行扩展运算时，只会返回`c`自身的属性`c.p`，而不会返回`c`的方法`c.m()`，因为这个方法定义在`C`的原型对象上（详见 Class 的章节）。
+
 对象的扩展运算符等同于使用`Object.assign()`方法。
 
 ```javascript