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js代码实现点击按钮出现60秒倒计时

2018-3-18 钟建超

1、
<input type="button" id="btn" value="免费获取验证码" />
<script type="text/javascript">
var wait=60;
function time(o) {
  if (wait == 0) {
   o.removeAttribute("disabled");   
   o.value="免费获取验证码";
   wait = 60;
  } else { 
 
   o.setAttribute("disabled", true);
   o.value="重新发送(" + wait + ")";
   wait--;
   setTimeout(function() {
    time(o)
   },
   1000)
  }
 }
document.getElementById("btn").onclick=function(){time(this);}
</script>



2、

<!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>无标题文档</title> 
<script type="text/javascript" src="js/jquery.js"></script> 
</head> 
 
<body> 
<input type="button" id="btn" value="免费获取验证码" onclick="settime(this)" /> 
<script type="text/javascript"> 
var countdown=60; 
function settime(val) { 
if (countdown == 0) { 
val.removeAttribute("disabled"); 
val.value="免费获取验证码"; 
countdown = 60; 
} else { 
val.setAttribute("disabled", true); 
val.value="重新发送(" + countdown + ")"; 
countdown--; 
} 
setTimeout(function() { 
settime(val) 
},1000) 
} 
</script> 
</body> 
</html>


标签: js