diff --git a/iqiyi.py b/iqiyi.py
index 6d633b7..7a8c220 100644
--- a/iqiyi.py
+++ b/iqiyi.py
@@ -1,48 +1,75 @@
 # 获取爱奇艺直播的真实流媒体地址。
 # iqiyi.js是cmd5x加密函数
 
-import execjs
 import json
-import requests
 import re
 import time
 import urllib.parse
 
+import execjs
+import requests
+
 
 class IQiYi:
+    """获取爱奇艺 m3u8 格式直播源
+
+    输入房间号，通常是数字，比如链接 https://gamelive.iqiyi.com/w/74429 中的 74429。
+    注意：
+        爱奇艺有部分直播是来自pps的，要打开房间看链接是否有跳转，有则用pps.py
+        爱奇艺直播依赖js环境，建议安装node.js。
+
+    Attributes:
+        rid:    房间号
+    """
 
     def __init__(self, rid):
         self.rid = rid
+        self.s = requests.Session()
 
     def get_real_url(self):
-        try:
-            response = requests.get('https://m-gamelive.iqiyi.com/w/' + self.rid).text
-            # 获取直播间的qipuId
-            qipuId = re.findall(r'"qipuId":(\d*?),"roomId', response)[0]
-            callback = 'jsonp_' + str(int((time.time() * 1000))) + '_0000'
-            params = {
-                'lp': qipuId,
-                'src': '01010031010000000000',
-                'rateVers': 'H5_QIYI',
-                'qd_v': 1,
-                'callback': callback
-            }
+        """
+        里面iqiyi.js是个加盐的md5，execjs执行后获取cmd5x的返回值
 
-            # ba传参iqiyi.js
-            ba = '/jp/live?' + urllib.parse.urlencode(params)
-            with open('iqiyi.js', 'r') as f:
-                content = f.read()
+        Returns:
+            m3u8格式播放地址
+
+        Raises:
+            incorrect rid: 请确实是爱奇艺直播房间号：爱奇艺有部分直播是来自pps的，要打开房间看链接是否有跳转，有则用pps.py
+            Could not find an available JavaScript runtime: 是否安装了js环境
+
+        """
+
+        res = self.s.get('https://m-gamelive.iqiyi.com/w/' + self.rid).text
+        # 获取直播间的qipuId
+        try:
+            qipuid, = re.findall(r'"qipuId":(\d*?),"roomId', res)
+        except ValueError:
+            raise Exception('Incorrect rid.')
+
+        callback = 'jsonp_' + str(int((time.time() * 1000))) + '_0000'
+        params = {
+            'lp': qipuid,
+            'src': '01010031010000000000',
+            'rateVers': 'H5_QIYI',
+            'qd_v': 1,
+            'callback': callback
+        }
+        # ba传参iqiyi.js,返回vf
+        ba = '/jp/live?' + urllib.parse.urlencode(params)
+        with open('iqiyi.js', 'r') as f:
+            content = f.read()
+        try:
             cmd5x = execjs.compile(content)
             vf = cmd5x.call('cmd5x', ba)
+        except RuntimeError:
+            raise Exception('Could not find an available JavaScript runtime.')
+        # 请求
+        response = self.s.get('https://live.video.iqiyi.com' + ba, params={'vf': vf}).text
+        url_json = json.loads(re.findall(r'try{.*?\((.*)\);}catch\(e\){};', response)[0])
+        url = (url_json.get('data').get('streams'))[0].get('url')
+        url = url.replace('hlslive.video.iqiyi.com', 'm3u8live.video.iqiyi.com')
 
-            # 请求
-            response = requests.get('https://live.video.iqiyi.com' + ba, params={'vf': vf}).text
-            url_json = json.loads(re.findall(r'try{.*?\((.*)\);}catch\(e\){};', response)[0])
-            real_url = (url_json.get('data').get('streams'))[0].get('url')
-            real_url = real_url.replace('hlslive.video.iqiyi.com', 'm3u8live.video.iqiyi.com')
-        except:
-            raise Exception('直播间不存在或未开播')
-        return real_url
+        return url
 
 
 def get_real_url(rid):