js realizes the countdown effect of clicking to get the verification code_javascript skills

In order to prevent malicious attempts to obtain verification text messages and verification emails, the website will have a countdown effect on the button that clicks to obtain the verification code. To implement this function, a setInterval and a clearInterval can be used, and it does not require too much code. The example effects and codes are as follows:

<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<input type="button" style="height:32px;width:120px;" value="点击发送验证码" onclick="sendCode(this)" />
<script type="text/javascript">
 var clock = '';
 var nums = 10;
 var btn;
 function sendCode(thisBtn)
 { 
 btn = thisBtn;
 btn.disabled = true; //将按钮置为不可点击
 btn.value = nums+'秒后可重新获取';
 clock = setInterval(doLoop, 1000); //一秒执行一次
 }
 function doLoop()
 {
 nums--;
 if(nums > 0){
  btn.value = nums+'秒后可重新获取';
 }else{
  clearInterval(clock); //清除js定时器
  btn.disabled = false;
  btn.value = '点击发送验证码';
  nums = 10; //重置时间
 }
 }
</script>

Use setInterval and clearIntervaljs to achieve the countdown effect of js click to obtain verification code. I hope it will be helpful to everyone's learning.