//获取验证码
get_vertify_code:function(){
XXX.send_sms("method, data, success）{
if(msg.message.code === 0){
//msg是ajax返回的回调信息，code==0是后台配置的执行成功的状态码，这里放的是请求成功的回调内容
}
}
}
//点击获取验证码后显示倒计时
count_down:function(){
var t = 60;
var count_down = setInterval(function(){
t--;
$(.count_down_span).text(t + 's');
if(t <= 0){
$(".get_verify_code_span").text("重新获取").show();
$(".count_dowm_span").text("60s").hide();
t=60;
clearInterval(count_down);
}
},1000);
}