感谢老师！

找到原因了，低级错误

逻辑代码没有问题，API 写错了！登录API 写成了注册的！汗

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1.成功注册后，登录报错截图：

2.传参代码如下（与老师相同）：

register(mobile, nickname, password): Observable<string[]> {

return this.getUrlReturn(this.apiUrlRegister + "?mobile=" + mobile + "&nickname=" + nickname + "&password=" + password)}

login(mobile, password): Observable<string[]> {

return this.getUrlReturn(this.apiUrlLogin + "?mobile=" + mobile + "&password=" + password);

}

getUserInfo(userId): Observable<string[]> {

return this.getUrlReturn(this.apiUrlUserInfo + "?userid=" + userId);}

updateNickName(userId,nickname):Observable<string[]>{

return this.getUrlReturn(this.apiUrlUpdateNickName + "?userid=" + userId + "&nickname=" + nickname);

}