微信调用小程序码生成接口共有A，B，C三个类型，目前调用B接口能够成功生成小程序码，调用A，C接口返回40159错误，具体为【{"errcode":40159,"errmsg":"invalid length for path, or the data is not json string hint: [jQQCeA07788927]"}】，传的参数为：{"width":430,"page":"pages/service/service"}，相同的参数用B接口就可以成功生成小程序码.