用正则或者字符串前后截取下，用json.loads加载生成字典
完整的html是什么，现在有开始字符，需要找到结束字符是什么才好截取。
比如下面这样，题主改下开始和结束的内容
import json
html='''
<script>
var AppData = {"name":"bangdan","query":{"year":"0","term":"0","id":"39","timeStamp":"1661645982475","channelId":"40011","index":"3","signKey":"b8833acba83e765770c80d6fc06d6371","sVersion":"1","webdriver":"false"},"$showAppLink":true,"$schema":"meituanmovie://www.meituan.com/web?url=https%3A%2F%2Fi.maoyan.com%2Fasgard%2Fboard%3Fid%3D39%26year%3D0%26term%3D0","$urlQuery":{"year":"0","term":"0","limit":10,"offset":0},"browser":{"ua":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/104.0.5112.102 Safari/537.36 Edg/104.0.1293.63","name":"chrome","version":"104.0.5112","vender":"apple","platform":"unknow","platformVersion":"unknow","core":{"name":"chrome","version":104},"type":"normal"},"$browser":{"ua":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/104.0.5112.102 Safari/537.36 Edg/104.0.1293.63","name":"chrome","version":"104.0.5112","vender":"apple","platform":"unknow","platformVersion":"unknow","core":{"name":"chrome","version":104},"type":"normal"},"$title":"猫眼榜单","$description":"猫眼榜单,猫眼Top100","$keywords":"猫眼榜单,猫眼Top100","$url":"https://i.maoyan.com/asgard/board?year=0&term=0&id=39&timeStamp=1661645982475&channelId=40011&index=3&signKey=b8833………………"}'''
sstart="var AppData = "#开始字符串
send='………"}'#结束字符串，这里如果不是json内容一部分，下面的截取代码不要加上结束字符串
startindex=html.find(sstart)+len(sstart)#开始位置
endindex=html.find(send,startindex)#结束位置
s=html[startindex:endindex]+send
o=json.loads(s)
print(o)
print(o['$url'])