<input id="second" type="button" value="免费获取验证码" />

//发送验证码时添加cookie
function addCookie(name,value,expiresHours){ 
  var cookieString=name+"="+escape(value); 
  //判断是否设置过期时间,0代表关闭浏览器时失效
  if(expiresHours>0){ 
    var date=new Date(); 
    date.setTime(date.getTime()+expiresHours*1000); 
    cookieString=cookieString+";expires=" + date.toUTCString(); 
  } 
    document.cookie=cookieString; 
} 
//修改cookie的值
function editCookie(name,value,expiresHours){ 
  var cookieString=name+"="+escape(value); 
  if(expiresHours>0){ 
   var date=new Date(); 
   date.setTime(date.getTime()+expiresHours*1000); //单位是毫秒
   cookieString=cookieString+";expires=" + date.toGMTString(); 
  } 
   document.cookie=cookieString; 
} 
//根据名字获取cookie的值
function getCookieValue(name){ 
   var strCookie=document.cookie; 
   var arrCookie=strCookie.split("; "); 
   for(var i=0;i<arrCookie.length;i++){ 
    var arr=arrCookie[i].split("="); 
    if(arr[0]==name){
     return unescape(arr[1]);
     break;
    }else{
       return ""; 
       break;
     } 
   } 
    
}

$(function(){
  $("#second").click(function (){
    sendCode($("#second"));
  });
  v = getCookieValue("secondsremained");//获取cookie值
  if(v>0){
    settime($("#second"));//开始倒计时
  }
})
//发送验证码
function sendCode(obj){
  var phonenum = $("#phonenum").val();
  var result = isPhoneNum();
  if(result){
    doPostBack('${base}/login/getCode.htm',backFunc1,{"phonenum":phonenum});
    addCookie("secondsremained",60,60);//添加cookie记录,有效时间60s
    settime(obj);//开始倒计时
  }
}
//将手机利用ajax提交到后台的发短信接口
function doPostBack(url,backFunc,queryParam) {
  $.ajax({
    async : false,
    cache : false,
    type : 'POST',
    url : url,// 请求的action路径
    data:queryParam,
    error : function() {// 请求失败处理函数
    },
    success : backFunc
  });
}
function backFunc1(data){
  var d = $.parseJSON(data);
  if(!d.success){
    alert(d.msg);
  }else{//返回验证码
    alert("模拟验证码:"+d.msg);
    $("#code").val(d.msg);
  }
}
//开始倒计时
var countdown;
function settime(obj) { 
  countdown=getCookieValue("secondsremained");
  if (countdown == 0) { 
    obj.removeAttr("disabled");  
    obj.val("免费获取验证码"); 
    return;
  } else { 
    obj.attr("disabled", true); 
    obj.val("重新发送(" + countdown + ")"); 
    countdown--;
    editCookie("secondsremained",countdown,countdown+1);
  } 
  setTimeout(function() { settime(obj) },1000) //每1000毫秒执行一次
} 
//校验手机号是否合法
function isPhoneNum(){
  var phonenum = $("#phonenum").val();
  var myreg = /^(((13[0-9]{1})|(15[0-9]{1})|(18[0-9]{1}))+\d{8})$/; 
  if(!myreg.test(phonenum)){ 
    alert('请输入有效的手机号码！'); 
    return false; 
  }else{
    return true;
  }
}