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<div class="col-md-1">
<div class="input-cont">
<input id="yzm" onclick="count()" type="button" class="btn blue btn-block" value="获取验证码">
</div>
</div>
<script>
function count(){
n=4;
var time = setInterval(function(){
n--;
$('#yzm').removeAttr('onclick').removeClass('blue').addClass('gray').val(n);
if(n <= 0){
$('#yzm').attr('onclick','count()').removeClass('gray').addClass('blue').val('重获验证码');
clearInterval(time);
}
},1000);
}
</script>