angular点击按钮倒计时

 $rootScope.timer = function(time, buttonid) {
      var btn = $(buttonid);
      btn.attr("disabled", true); //按钮禁止点击
     //  btn.html(time <= 0 ? "发送动态密码" : ("" + (time) + "秒后可发送"));
      var hander = setInterval(function() {
        if (time <= 0) {
          clearInterval(hander); //清除倒计时
          btn.html("发送验证码");
          btn.attr("disabled", false);
          return false;
        } else {
          btn.html("" + (time--) + "秒后可发送");
        }
      }, 1000);
    };