40169 获取小程序码

1. data:"{"page":"pages/index/index"}"

2. fail:ƒ fail()

3. method:"POST"

4. success:ƒ success(res)

5. url:"https://api.weixin.qq.com/wxa/getwxacodeunlimit?access_token" + '我的token'

这种操作为什么会失败

“errcode”:40169,“errmsg”:“invalid length for scene, or the data is not json string hint: [60133e622]”