From aebcc496eefb0b4880b0d7b2caa1da0cec30d9c2 Mon Sep 17 00:00:00 2001
From: waiting <1661926154@qq.com>
Date: Sat, 25 May 2019 17:30:16 +0800
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v8 7.2 引擎的 spread 展开运算性能比 for-of 更高
ref: https://v8.js.cn/blog/spread-elements/
---
 docs/string-methods.md | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/docs/string-methods.md b/docs/string-methods.md
index 07b2938..0d5f4cd 100644
--- a/docs/string-methods.md
+++ b/docs/string-methods.md
@@ -123,6 +123,16 @@ for (let ch of s) {
 // 61
 ```
 
+或者使用 `Spread` 展开运算
+
+```javascript
+let arr = [...'𠮷a']; // arr.length === 2
+arr.forEach(ch => console.log(ch.codePointAt(0).toString(16)));
+// 20bb7
+// 61
+```
+
+
 `codePointAt()`方法是测试一个字符由两个字节还是由四个字节组成的最简单方法。
 
 ```javascript