前言

在调用API的时候，有些API会返回bytes类型的串，格式如下：

b'{"status":"0","msg":"ok","result":{"type":"google","from":"zh-cn","to":"en","text":"\xe4\xb8\xad\xe5\x9b\xbd",
"result":"China<br \/><br \/><strong>\xe5\x90\x8d\xe8\xaf\x8d<\/strong><br \/><span class=\"green\">China<\/span> 
\xe4\xb8\xad\xe5\x9b\xbd, \xe5\x8d\x8e, \xe4\xb8\xad\xe5\x8d\x8e<br \/>"}}'b'{"st