v3版本请求数据后台接收到的是单个字母的数组

[he426100]

array (
0 => 'u',
1 => 's',
2 => 'e',
3 => 'r',
4 => 'n',
5 => 'a',
6 => 'm',
...
)
本来是 username=...
非v3版本可以

给uni.request传递的config为
{
baseUrl: "http://xxx.xxx.x.xxx/api/"
complete: ƒ (response)
data: "username=xxx&password=xxx&type=xxx&captcha="
dataType: "json"
fail: ƒ fail()
header: {Content-Type: "application/x-www-form-urlencoded;charset=UTF-8", X-AUTH-DEVICE: ""}
method: "POST"
responseType: "text"
silence: false
success: ƒ success()
url: "http://xxx.xxx.x.xxx/api/user/signin"
}