From 6a10936d64141e161f62aff8ce37fb7749fdd24c Mon Sep 17 00:00:00 2001
From: ruanyf <yifeng.ruan@gmail.com>
Date: Sat, 10 Nov 2018 17:59:52 +0800
Subject: [PATCH] =?UTF-8?q?docs(object):=20edit=20=E6=89=A9=E5=B1=95?=
 =?UTF-8?q?=E8=BF=90=E7=AE=97=E7=AC=A6?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 docs/array.md     | 12 ++++++++++++
 docs/object.md    | 10 +++++++++-
 docs/reference.md |  1 +
 3 files changed, 22 insertions(+), 1 deletion(-)

diff --git a/docs/array.md b/docs/array.md
index 2f12181..5c0917b 100644
--- a/docs/array.md
+++ b/docs/array.md
@@ -58,6 +58,18 @@ const arr = [
 // [1]
 ```
 
+注意，扩展运算符如果放在括号中，JavaScript 引擎就会认为这是函数调用，否则就会报错。
+
+```javascript
+(...[1,2])
+// Uncaught SyntaxError: Unexpected number
+
+console.log((...[1,2]))
+// Uncaught SyntaxError: Unexpected number
+```
+
+上面两种情况都会报错，因为扩展运算符所在的括号不是函数调用，而`console.log(...[1, 2])`就不会报错，因为这时是函数调用。
+
 ### 替代函数的 apply 方法
 
 由于扩展运算符可以展开数组，所以不再需要`apply`方法，将数组转为函数的参数了。
diff --git a/docs/object.md b/docs/object.md
index ddb525b..981f320 100644
--- a/docs/object.md
+++ b/docs/object.md
@@ -563,7 +563,15 @@ let n = { ...z };
 n // { a: 3, b: 4 }
 ```
 
-这等同于使用`Object.assign`方法。
+由于数组是特殊的对象，所以对象的扩展运算符也可以用于数组。
+
+```javascript
+let foo = { ...['a', 'b', 'c'] };
+foo
+// {0: "a", 1: "b", 2: "c"}
+```
+
+对象的扩展运算符等同于使用`Object.assign()`方法。
 
 ```javascript
 let aClone = { ...a };
diff --git a/docs/reference.md b/docs/reference.md
index 0797764..a83cac2 100644
--- a/docs/reference.md
+++ b/docs/reference.md
@@ -103,6 +103,7 @@
 - Axel Rauschmayer, [Enumerability in ECMAScript 6](http://www.2ality.com/2015/10/enumerability-es6.html)
 - Axel Rauschmayer, [ES proposal: Object.getOwnPropertyDescriptors()](http://www.2ality.com/2016/02/object-getownpropertydescriptors.html)
 - TC39, [Object.getOwnPropertyDescriptors Proposal](https://github.com/tc39/proposal-object-getownpropertydescriptors)
+- David Titarenco, [How Spread Syntax Breaks Javascript](https://dvt.name/2018/06/02/spread-syntax-breaks-javascript/): 扩展运算符的一些不合理的地方
 
 ## Symbol