<i id="OneToOne_ShowWaitTime"></i>秒

 <em onclick="timeOpen();">开始</em>

 <em onclick="timeClose();">结束</em>

                    <script>

                        var c,t;

                        function GetBack() {

                            c--;

                            $("#OneToOne_ShowWaitTime").text(c);

                            if(c==){

                                console.log("stop");

                                return;

                            }

                            t=setTimeout("GetBack()",);

                            console.log("秒选择" + c);

                        }

                        function timeOpen(){

                            c = $("#M_waitInterval li.M_current").attr("value");

                            GetBack();

                        }

                        function timeClose(){

                            clearInterval(t);

                            t = null;

                        }

                    </script>