PHP中验证码类及使用方法(4)

                            {

                            s--;

                            document.getElementById('tips').innerHTML=s;

                            if(s==0)

                            {

                            clearTimeout(t);

                            history.go(-1);

                            }

                            }

                            var t=setInterval('ok()',1000);

                     </script>

" . "请输入的验证码,请重新输入<span id='tips'></span>秒之后，将为您跳转到<a href=\"javascript:history.go(-1)\">上一页</a>";

  }

摘自 http://itsafe.org/?p=384