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<input type="button" value="获取验证码"  onclick="clickButton(this)"/>

function clickButton(obj){
    var obj = $(obj);
    obj.attr("disabled","disabled");/*按钮倒计时*/
    var time = 60;
    var set=setInterval(function(){
    obj.val(--time+"(s)");
    }, 1000);/*等待时间*/
    setTimeout(function(){
    obj.attr("disabled",false).val("重新获取验证码");/*倒计时*/
    clearInterval(set);
    }, 60000);
}

60秒倒计时

$('#sendSns').click(function(){
    timeOut('#sendSns',60);
});
//60秒之后重新发送
function timeOut(id,times){
    var sendBtn = $(id);
    var html = times+'秒后重新发送';
    sendBtn.addClass('btn-dis');
    sendBtn.val(html);
    sendBtn.attr('disabled',true);
 
    var timer = setInterval(function(){
        times--;
        sendBtn.val(times+'秒后重新发送');
        if(times===0){
            clearInterval(timer);
            sendBtn.val('发送验证码');
            sendBtn.removeClass('btn-dis');
            sendBtn.attr('disabled',false);
            return true;
        }else{
            return false;
        }
    },1000);
}