!353 update docs/uniCloud/cf-callfunction.md.

Merge pull request !353 from mmsen/N/A

docs/uniCloud/cf-callfunction.md

@@ -293,3 +293,47 @@ exports.main = async (event, context) => {
 	return {sum:c,errCode : 1,errMsg : "0"}
 };
 ```
+
+## 在云函数中使用cookie
+
+在某些场景下，cookie依然占有重要地位，例如在云函数URL化的情况下，获取客户端的状态
+
+在云函数中使用cookie需要依赖cookie库[npm页面地址](http://https://www.npmjs.com/package/cookie)，可以通过`npm inistall cookie` 安装
+
+```js
+'use strict';
+
+//引入cookie
+const cookie = require('cookie')
+exports.main = async (event, context) => {
+	//event为客户端上传的参数
+	//如果客户端有cookie，则cookie回随请求携带至服务端，放置在event.headers.cookie中,假设 cookie为“[jwt=自加密base64; app=uniCloud]”
+	console.log('event : ', event)
+    
+        //解析cookie
+        const cookieData = cookie.parse( event.headers.cookie||'' )
+        console.log(cookieData)//输出结果为：{jwt:"自加密base64", app:"uniCloud" }
+
+        //设置cookie到客户端
+
+        const cookieOptions = {
+            //具体参数请查阅 https://www.npmjs.com/package/cookie
+            maxAge: 60 * 60 * 24 * 7,//一周
+            path:"/"
+        }
+        const setCookieData = cookie.serialize('app', 'appName', cookieOptions)
+        return {
+            statusCode: 200,
+            headers: {
+                'content-type': '返回数据类型',
+                'set-cookie': setCookieData
+            },
+            body: '返回数据'
+        }
+	
+};
+
+```
+
+
+