文档地址：https://developers.weixin.qq.com/doc/offiaccount/Message_Management/Batch_Sends_and_Originality_Checks.html#%E9%A2%84%E8%A7%88%E6%8E%A5%E5%8F%A3%E3%80%90%E8%AE%A2%E9%98%85%E5%8F%B7%E4%B8%8E%E6%9C%8D%E5%8A%A1%E5%8F%B7%E8%AE%A4%E8%AF%81%E5%90%8E%E5%9D%87%E5%8F%AF%E7%94%A8%E3%80%91

文档上没有说towxname限制是否只能是字符串类型？如果多个微信号如何传值？数组传多个微信号，还是字符串每次传一个微信号，循环调用接口？