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Three ways to implement user registration countdown function using js and jQuery

小云云Original: 2017-12-23 09:45:501500browse

The countdown function is very common, and there are many ways to implement the countdown function. This article mainly introduces the countdown function of the user registration protocol implemented by js and jQuery. It analyzes the related implementation skills of the three countdown functions in the form of examples. Friends in need can refer to it. Next, I hope it can help everyone.

Method 1:

<html xmlns="http://www.w3.org/1999/xhtml">
<head>
  <title>www.jb51.net 注册倒计时</title>
  <script type="text/javascript">
    //用户有十秒钟的时间看协议，超过十秒钟，“同意”按钮将生效
    var Seconds = 10;
    //计时器ID
    var setIntervalID;
    function ok() {
      var getid = document.getElementById("but");
      if (Seconds <= 0) {
        getid.value="同意";
        getid.disabled = false; //或者写成getid.disabled=""; 启用getid控件。
        //停止计时器
        clearInterval(setIntervalID);
      }
      else {
        getid.value = "请仔细阅读协议还剩下【" + Seconds + "】秒";
      }
      Seconds--;
    }
   setIntervalID=setInterval("ok()", 1000);
  </script>
</head>
<body>
<textarea cols="20" rows="8"></textarea><br />
<!--disabled="disabled" 默认submit表单是禁用的，也就是只读的，不能点击-->
<input type="submit" id ="but" value="同意" disabled="disabled" />
</body>
</html>

Running effect:

Method 2:

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
  <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
  <title>www.jb51.net 注册倒计时</title>
  <script src="jquery-1.7.2.min.js"></script>
</head>
<body>
  <form action="http://www.jb51.net/" method="post" name="agree">
    <input type="submit" class="button" value="" name="agreeb">
  </form>
</body>
</html>
<script>
  var secs = 5;
  var si;
  $(function () {
    $(".button").attr("disabled", "disabled");
    $(".button").val("请认真查看<服务条款和声明>(" + secs + ")")
    si = setInterval(a, 1000);
  })
  function a() {
    $(".button").val("请认真查看<服务条款和声明>(" + (secs-1) + ")");
    if (secs == 0) {
      clearInterval(si);
      $(".button").val("我同意" ).removeAttr("disabled");
    }
    secs--;
  }
</script>

Running effect:

Method three:

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
  <title>www.jb51.net 注册倒计时</title>
</head>
<body>
  <form action="http://www.jb51.net/" method="post" name="agree">
    <input type="submit" class="button" value="请认真查看<服务条款和声明> (30)" name="agreeb">
  </form>
</body>
</html>
<script>
  var secs = 30;
  document.agree.agreeb.disabled = true;
  for (var i = 1; i <= secs; i++) {
    window.setTimeout("update(" + i + ")", i * 1000);
  }
  function update(num) {
    if (num == secs) {
      document.agree.agreeb.value = " 我 同 意 ";
      document.agree.agreeb.disabled = false;
    }
    else {
      var printnr = secs - num;
      document.agree.agreeb.value = "请认真查看<服务条款和声明> (" + printnr + ")";
    }
  }
</script>

Running effect:

Have you learned how to strike? Hurry up and give it a try.

Related recommendations:

An example to explain the countdown function of the WeChat applet

The countdown function of sending a verification code when registering with a mobile phone

Javascript Get verification code 60 seconds countdown

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