jacky810124

var pcsc = require('pcsclite');

var pcsc = pcsc();
pcsc.on('reader', function(reader) {

    console.log('New reader detected', reader.name);

    reader.on('error', function(err) {
        console.log('Error(', this.name, '):', err.message);
    });

jacky810124

var lengthOfLongestSubstring = function(s) {
  var start = 0
  var end = 0
  var temp = ''
  var result = ''
  var times = 1

  while (end < s.length) {
    console.log(`#${times}`)

jacky810124

<form action="https://www.paypal.com/cgi-bin/webscr" method="post" target="_top">
  <input type="hidden" name="cmd" value="_s-xclick">
  <input type="hidden" name="hosted_button_id" value="4MVG5ES3Z4Y3J">
  <input type="image" src="https://www.paypalobjects.com/zh_TW/TW/i/btn/btn_buynowCC_LG_wCUP.gif" border="0" name="submit"
    alt="PayPal － 更安全、更簡單的線上付款方式！">
  <img alt="" border="0" src="https://www.paypalobjects.com/zh_TW/i/scr/pixel.gif" width="1" height="1">
</form>

jacky810124

const regexpTable = {
  tw: /^09\d{8}$/,
  cn: /^1[34578]\d{9}$/,
  hk: /^([6|9])\d{7}$/,
  mo: /^[0][9]\d{8}$/
}

jacky810124

// In web browsers, the window object is also the global object:
console.log(this === window); // true

a = 37;
console.log(window.a); // 37

this.b = "MDN";
console.log(window.b)  // "MDN"
console.log(b)         // "MDN"

jacky810124

function f1() {
  return this;
}

// In a browser:
f1() === window; // true 

// In Node:
f1() === global; // true

jacky810124

function f2(){
  "use strict"; // 嚴格模式
  return this;
}

f2() === undefined;

jacky810124

// An object can be passed as the first argument to call or apply and this will be bound to it.
var obj = {a: 'Custom'};

// This property is set on the global object
var a = 'Global';

function whatsThis(arg) {
  return this.a;  // The value of this is dependent on how the function is called
}

jacky810124

function bar() {
  console.log(Object.prototype.toString.call(this));
}

bar.call(7);     // [object Number]
bar.call('foo'); // [Object String]

jacky810124

var globalObject = this;
var foo = (() => this);
console.log(foo() === globalObject); // true