JavaScript setInterval 启用和停止

    var iCount =  setInterval(ChangeTime, 3500);//3.5秒请求一次函数
    function ChangeTime() {

        $.ajax({
            type: "POST",
            url: "/Home/Index/is_ajax_no",
            success: function(msg){
                   if(msg == 1){
                      clearInterval(iCount); //停止刷新事件,防止出现页面跳转过慢,请求多次
                      location.href = ‘/Home/Index/reg_result_no_card‘;
                      return false;
                   }
            }

        });
    }