增加signTokne机制
https://gateway.downtown8.net/posuser/captcha/verifyCaptcha
换成 https://gateway.downtown8.net/posuserSignCaptcha/verifyCaptcha
https://gateway.downtown8.net/posuser/captcha/sendCaptcha
换成 https://gateway.downtown8.net/posuserSignCaptcha/sendCaptcha