js获取手机验证码倒计时的实现

 1 <div class="div user-input">  
 2   <input type="number" class="code" name="verify" placeholder="请输入手机验证码" required maxlength="6">  
 3   <input type="button" class="obtain generate_code" value=" 获取验证码">  
 4 </div>  
 5 <script type="text/javascript">  
 6   $(function(){  
 7     $(".generate_code").click(function(){  
 8       var disabled = $(".generate_code").attr("disabled");  
 9       if(disabled){  
10         return false;  
11       }  
12       if($("#mobile").val() == "" || isNaN($("#mobile").val()) || $("#mobile").val().length != 11 ){  
13         alert("请填写正确的手机号！");  
14         return false;  
15       }  
16       $.ajax({  
17         async:false,  
18         type: "GET",  
19         url: "{:U(‘User/sms‘)}",  
20         data: {mobile:$("#mobile").val()},  
21         dataType: "json",  
22         async:false,  
23         success:function(data){  
24           console.log(data);  
25           settime();  
26         },  
27         error:function(err){  
28           console.log(err);  
29         }  
30       });  
31     });  
32     var countdown=60;  
33     var _generate_code = $(".generate_code");  
34     function settime() {  
35       if (countdown == 0) {  
36         _generate_code.attr("disabled",false);  
37         _generate_code.val("获取验证码");  
38         countdown = 60;  
39         return false;  
40       } else {  
41         $(".generate_code").attr("disabled", true);  
42         _generate_code.val("重新发送(" + countdown + ")");  
43         countdown--;  
44       }  
45       setTimeout(function() {  
46         settime();  
47       },1000);  
48     }  
49   })  
50   
51 </script>

<div class="div user-input">  
  <input type="number" class="code" placeholder="请输入手机验证码" required maxlength="6">  
  <input type="button" class="obtain generate_code" value=" 获取验证码" onclick="settime(this);">  
</div>  
<script type="text/javascript">  
  
//倒计时  
var countdown=60;  
function settime(val) {  
    if (countdown == 0) {  
        val.removeAttribute("disabled");  
        val.value="获取验证码";  
        countdown = 60;  
        return false;  
    } else {  
        val.setAttribute("disabled", true);  
        val.value="重新发送(" + countdown + ")";  
        countdown--;  
    }  
    setTimeout(function() {  
        settime(val);  
    },1000);  
}  
</script>