Pure js realizes the reciprocal function of the button of the retest verification code

2020-05-30 19:29:31
OfStack

Code 1:


<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 
<html xmlns="http://www.w3.org/1999/xhtml"> 
<head> 
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> 
<title> Headless document </title> 
<script type="text/javascript" src="js/jquery.js"></script> 
</head> 

<body> 
<input type="button" id="btn" value=" Get the captcha for free " onclick="settime(this)" /> 
<script type="text/javascript"> 
var countdown=60; 
function settime(val) { 
if (countdown == 0) { 
val.removeAttribute("disabled");  
val.value=" Get the captcha for free "; 
countdown = 60; 
} else { 
val.setAttribute("disabled", true); 
val.value=" To resend (" + countdown + ")"; 
countdown--; 
} 
setTimeout(function() { 
settime(val) 
},1000) 
} 
</script> 
</body> 
</html>

Code 2:

When you register, you need to send an email to verify and activate the account. In order to avoid repeated sending of the email, you can set button for 1 period of time after you click send. Here's a simple example:


<html> 
<head> 
<title> Click the button to get the captcha and the button will turn grey 1 After a period of time can be repeated click </title> 
</head> 
<body> 
<input type="button" id="btn" value=" Get the captcha for free " /> 
<script type="text/javascript"> 
var wait=60; 
function time(o) { 
    if (wait == 0) { 
      o.removeAttribute("disabled");      
      o.value=" Get the captcha for free "; 
      wait = 60; 
    } else { 
      o.setAttribute("disabled", true); 
      o.value=wait+" You can resend it in seconds "; 
      wait--; 
      setTimeout(function() { 
        time(o) 
      }, 
      1000) 
    } 
  } 
document.getElementById("btn").onclick=function(){time(this);} 
</script> 
</body> 
</html>