验证码倒计时JS

var countdown=10; function settime(obj){if (countdown == 0) {     obj.innerHTML="免费获取验证码";         countdown = 10;         $(obj).attr("onclick","settime(this)");        return;    }else{    var mobile = $("#mobile").val();    obj.innerHTML = "重新发送(" + countdown + ")";        countdown--;         $(obj).removeAttr("onclick");    }     setTimeout(function() {settime(obj)},1000)}

页面：

<div><div class="lable"><span class="color-red">*</span>手机验证码：</div><div><input name="verCode" type="text" placeholder="请输入手机验证码!" /><span><a href="javascript:void(0)"  onclick="settime(this)">发送验证码</a></span><div></div></div></div>