获取图形验证码

{
    "code": 1,
    "info": "生成拼图成功",
    "data": {
        "bgimg": "data:image/png;base64,iVBOR...",
        "water": "data:image/png;base64,iVBOR...",
        "uniqid": "V821557169802955"
    }
}