js定時器

計時器

var limit_seconds = 10;//秒

                                                                      vartimer = setInterval(function(){    //开启定时器

                                                                             if(limit_seconds>= 0){

                                                                               var seconds = Math.floor(limit_seconds%60);

                                                                               seconds = seconds + ""

                                                                               var msgTime =seconds.substr(0,2);

                                                                              document.getElementById("t_s").innerHTML = msgTime;

                                                                               --limit_seconds;

                                                                              }else{

                                                                            

                                                                                    clearInterval(timer);    //清除定时器

                                                                              }

                                                                   },1000);