javascript - 如何为html中的多个元素设置相同的id

Question

我想对运行时创建的 10 个元素使用倒计时器。每个元素都有过期时间，所以我想向用户显示剩余的过期时间。所以我使用 jquery 文件来执行此操作。所以我必须使用标签的 id 来显示剩余时间。当我使用它时对于一个元素它工作正常，但是当我将它用于多个元素时它只适用于第一个元素。我如何解决这个问题以显示所有元素的剩余时间

Jquery 文件

    //var count = 1000;
    //var counter = setInterval(timer, 1000);
    //function timer() {
    //    count -= 1;
    //    if (count==1000) {
    //        clearInterval(counter);
    //    }
    //    document.getElementById("num").innerHTML = count;
    //}
    function CountDown() {

        this.start_time = "02:00:00:23";
        this.target_id = "#timer";
        this.name = "timer";
    }

CountDown.prototype.init=function(){
    this.reset();
    setInterval(this.name+'.tick()',1000);
}
CountDown.prototype.reset=function(){
    time = this.start_time.split(":");
    this.days = parseInt(time[0]);
    this.hours = parseInt(time[1]);
    this.minutes=parseInt(time[2]);
    this.seconds = parseInt(time[3]);
    this.update_target();
}

CountDown.prototype.tick=function(){
    if (this.seconds > 0 || this.minutes > 0 || this.hours > 0 ||this.days>0) {

        if (this.hours == 0 && this.minutes == 0 && this.seconds == 0) {
            this.days = this.days - 1;
            this.hours = 23;
            this.minutes = 59;
            this.seconds = 59;
        }
        if (this.minutes == 0 && this.seconds==0) {
            this.hours = this.hours - 1;
            this.minutes = 59;
            this.seconds = 59;
        }
        else if (this.seconds == 0) {
            this.minutes = this.minutes - 1;
            this.seconds = 59;
        }
        else {
            this.seconds = this.seconds - 1;
        }

    }
    this.update_target();
}

CountDown.prototype.update_target = function () {
    seconds = this.seconds;
    minutes = this.minutes;
    hours = this.hours;
    days = this.days;
    if (seconds<10) 
        seconds = "0"+seconds;
    if (minutes < 10)
        minutes = "0"+ minutes;
    if (hours < 10)
        hours = "0" + hours;
    if (days < 10)
        days = "0" + days;
    $(this.target_id).val(days+":"+hours+":"+minutes + ":" + seconds)
   // $(this.target_id).val(this.minutes+":"+seconds) 


}

 Html




    <script src="~/Scripts/jquery-1.4.4.min.js"></script>
    <script src="~/Scripts/countdown.js"></script>
    <input type="text" id="timer" value=" " />
    <script>
        timer = new CountDown();
        timer.init();
    </script>

Answer 1

Id在html中是唯一的，使用类代替..更多元素可以具有相同的类

$('.yourClass') 

而不是

$('#yourId') 

.

 <script src="~/Scripts/jquery-1.4.4.min.js"></script>
  <script src="~/Scripts/countdown.js"></script>
  <input type="text"  class="timer" value=" " />
  <script>
    timer = new CountDown();
    timer.init();
  </script>


function CountDown() {

    this.start_time = "02:00:00:23";
    this.target_id = ".timer";
    this.name = "timer";
}