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wx.request()返回的是个promise对象吧，为什么then方法不支持

onLoad: function (options) {

wx.request({

url: 'http://t.talelin.com/v2/movie/in_theaters?start=0&count=3'

}).then((res)=>{

console.log(res);

})

报错

VM3171 WAService.js:2 TypeError: wx.request(...).then is not a function
    at qi.onLoad (movies.js? [sm]:24)
    at qi.<anonymous> (WAService.js?t=wechat&s=1628469214546&v=2.18.0:1)
    at qi.r.__callPageLifeTime__ (WAService.js?t=wechat&s=1628469214546&v=2.18.0:1)
    at Cn (WAService.js?t=wechat&s=1628469214546&v=2.18.0:1)
    at WAService.js?t=wechat&s=1628469214546&v=2.18.0:1
    at An (WAService.js?t=wechat&s=1628469214546&v=2.18.0:1)
    at Function.<anonymous> (WAService.js?t=wechat&s=1628469214546&v=2.18.0:1)
    at u.<anonymous> (WAService.js?t=wechat&s=1628469214546&v=2.18.0:1)
    at u.emit (WAService.js?t=wechat&s=1628469214546&v=2.18.0:1)
    at Object.emit (WAService.js?t=wechat&s=1628469214546&v=2.18.0:1)(env: Windows,mp,1.05.2107090; lib: 2.18.0)
errorReport @ VM3171 WAService.js:2
thirdErrorReport @ VM3171 WAService.js:2
(anonymous) @ VM3171 WAService.js:2
(anonymous) @ VM3171 WAService.js:2
r.__callPageLifeTime__ @ VM3171 WAService.js:2
Cn @ VM3171 WAService.js:2
(anonymous) @ VM3171 WAService.js:2
An @ VM3171 WAService.js:2
(anonymous) @ VM3171 WAService.js:2
(anonymous) @ VM3171 WAService.js:2
u.emit @ VM3171 WAService.js:2
emit @ VM3171 WAService.js:2
(anonymous) @ VM3171 WAService.js:2
u.emit @ VM3171 WAService.js:2
emit @ VM3171 WAService.js:2
(anonymous) @ VM3171 WAService.js:2
(anonymous) @ VM3171 WAService.js:2
c @ VM8 asdebug.js:1
u @ VM8 asdebug.js:1
(anonymous) @ VM8 asdebug.js:1
f @ VM8 asdebug.js:1
g @ VM8 asdebug.js:1
(anonymous) @ VM8 asdebug.js:1
_ws.onmessage @ VM8 asdebug.js:1