setInterval(function xxx(){
   //业务逻辑
},隔多少时间执行一次)

//计时器60秒
function timeInterval(){
  $("#code_send_btn").html("60秒后重新获取邮箱验证码");
  var timeSec = 59;
  var timeStr = '';
  var codeTime = setInterval(function Internal(){
    if (timeSec == 0){
      $("#code_send_btn").html("获取邮箱注册码");
      $("#code_send_btn").removeAttr("disabled","disabled");
      clearInterval(codeTime);
      return;
    }
    timeStr = "("+timeSec+")获取邮箱注册码";
    $("#code_send_btn").html(timeStr);
    timeSec--;
  },1000);
}