https://developers.weixin.qq.com/doc/oplatform/Website_App/WeChat_Login/Authorized_Interface_Calling_UnionID.html

uni.login({
					provider: "weixin",
					onlyAuthorize: true
				}).then(res => {
					res = this.$determine(res)
					this.errmsg=JSON.stringify(res)
					if (res.errMsg == 'login:ok') {
						console.log('code',res.code)
					
					}
获取code,给后端，提示code 无效

后端请求：
http请求方式: GET
https://api.weixin.qq.com/sns/oauth2/access_token?appid=APPID&secret=SECRET&code=CODE&grant_type=authorization_code
返回：
 {"errcode":40029,"errmsg":"invalid code, rid: 624e907f-08656c40-47262de6"}