JS发送验证码读秒（转）

 <input type="button" id="btnR" value="发送验证码" class="send-a" style="border:0px;" />
                                                        <script type="text/javascript">
                                                            var wait = 60;
                                                            document.getElementById("btnR").disabled = false;
                                                            function time(o) {
                                                                if (wait == 0) {
                                                                    o.removeAttribute("disabled");
                                                                    //$(o).attr("disabled", false);  jquery  
                                                                    o.value = "发送验证码";

                                                                    wait = 60;
                                                                } else {
                                                                    o.setAttribute("disabled", true);
                                                                    o.value = wait + "秒后,重新获取";
                                                                    wait--;
                                                                    setTimeout(function () {
                                                                        time(o)
                                                                    },
                                                                     1000)
                                                                }
                                                            }
                                                            document.getElementById("btnR").onclick =
                                                          function () {
                                                              if ($('#txtRPhone').val().length > 0) {
                                                                  sendSMS(2);
                                                                  if (resV == 1) {
                                                                      time(this);
                                                                  }
                                                              } else {
                                                                  alert("请填写手机号");
                                                              }
                                                          }  
                                                        </script>