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How Port Knocking Maker - Mikrotik Script RouterOS
In computer networking, port knocking is a method of externally opening ports on a firewall by generating a connection attempt on a set of prespecified closed ports. Once a correct sequence of connection attempts is received, the firewall rules are dynamically modified to allow the host which sent the connection attempts to connect over specific port(s). A variant called single packet authorization (SPA) exists, where only a single "knock" is needed, consisting of an encrypted packet.

The primary purpose of port knocking is to prevent an attacker from scanning a system for potentially exploitable services by doing a port scan, because unless the attacker sends the correct knock sequence, the protected ports will appear closed

###########################################################
# Mikrotik Port Knocking Generator with Icmp + Packet Size
# Date/Time: 2/14/2021, 12:14:10 PM
# https://fb.me/buananet.pbun
##################################################

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# delete local tag '12345'
git tag -d 12345
# delete remote tag '12345' (eg, GitHub version too)
git push origin :refs/tags/12345
# alternative approach
git push --delete origin tagName
git tag -d tagName

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function $dataAttr (nameWithData) {
  const originAttr = nameWithData.replace(/[A-Z]/g, $0 => '-' + $0.toLowerCase())
  return originAttr.replace(/^data-/, '').replace(/-([a-z])/g, ($0, $1) => $1.toUpperCase())
}
// nameWithData ----> dataSetName

// originAttr  ----> data-set-name

// return  ----> setName

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// Map 是 构造函数是  var a = new Map([ [key1, value1], [key2, value2]  ])

// key1只要与key2不是同一个引用就不会覆盖。  key1 与key2 可以是任何类型。

// WeakMap 不会进入到垃圾回收机制，当key值清空会自动回收，不进入垃圾回收（垃圾回收里面只要存在引用就不可以被回收，这样可以防止内存泄漏）

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在Mac、Linux 终端显示 Git 当前所在分支

1. 进入你的home目录

cd ~

1. 编辑.bashrc文件

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使用::和es5的bind&&call&&apply的区别。

使用call bind apply 不是一种面向oo的编程方式，所以会导致什么问题呢？  无法链式调用，这就很蛋疼了。
所以::操作符的一部分作用就是可以面向oo编程，可以链式调用。

example

fn2.bind(fn1.bind(this, a1)(argu1))(argu2)   恶心不？很恶心

this::fn1(argu1)::fn2(argu2)  OK，链式调用。

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function express() {

  var middlewares = [];
  
  var app = function(req, res) {
    var i = 0;
    function next() {
      var task = middlewares[i++];
      if (!task) {
        return;

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function Event() {
  this.fnMap = {};
}

Event.prototype.on = function(type, fn) {
  var fns = this.fnMap[type] || (this.fnMap[type] = [])
  fns.push(fn);
  return this;
};

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function addListener(element, type, handler) {
  if (element.addEventListener) {
    element.addEventListener(type, handler, false);
    return handler;
  } else if (element.attachEvent) {
    var wrapper = function() {
      var event = window.event;
      event.target = event.srcElement;
      handler.call(element, event);
    }

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function deepClone(obj) {
  var o = obj instanceof Array ? [] : {};
  for (var name in obj) {
    o[name] = typeof obj[name] === 'object' ? deepClone(obj[name]) : obj[name];
  }
  return o;
}