在百度贴吧首页使用该代码。如果新人不会用，可以提问！
var task_id;
go();
function go(){$.get("http://tieba.baidu.com/mo/q/start_task?is_ajax=1 ",function(res){if(res.data.errno!=3005){document.write("<hr>");task_id=res.data.task.task_id;$.get("http://tieba.baidu.com/mo/q/vcode_change?is_ajax=1&captcha_code_type=1 ",function(data){yzphoto(data.data.getcaptcha_res.captcha_vcode_str,res.data.task.succ_count,res.data.task.remain_count);},"JSON");}else{alert("您今天的机会以用完！");}},"json");};
function yzphoto(captcha,yesnum,num){document.body.innerHTML= "";document.write("<br><img src=\u0022http://tieba.baidu.com/cgi-bin/genimg? "+captcha+"\u0022onclick=\u0022this.src=this.src\u0022/><br>请将上方的验证码填入框中（正确次数："+yesnum+"/5，剩余次数："+num+"/7）<br><input class=str type=text /><input type=submit value=确认 onclick=tj(\u0022"+captcha+"\u0022); />")};
function tj(captcha){var str=$(".str")[0].value;$.post("http://tieba.baidu.com/mo/q/account_submit ",{is_ajax:1,captcha_vcode_str:captcha,captcha_input_str:str,task_id:task_id,captcha_code_type:1},function(data){if(data.data.captcha_err_no || data.data.task.fail_count<3){if(data.data.task.succ_count < 5){$.get("http://tieba.baidu.com/mo/q/vcode_change?is_ajax=1&captcha_code_type=1 ",function(res){yzphoto(res.data.getcaptcha_res.captcha_vcode_str,data.data.task.succ_count,data.data.task.remain_count);},"JSON");}else{alert("解封成功！");window.location.reload();}}else{document.write("<br><font color=red >验证码错误！您本次机会以用完！要选择<a href=javascript:go(); >再来一次</a>吗(一天只有两次机会哦)</font>？");}},"JSON")};