linx4200

// https://juejin.im/post/5d33fd0f5188256e820c80d4

function isFunction(func) {
  return typeof func === 'function';
}

function isArray(arr) {
  return Array.isArray(arr);
}

linx4200

function swap(arr, i, j) {
  const temp = arr[i];
  arr[i] = arr[j];
  arr[j] = temp;
}

/* 堆是完全二叉树 */
/* 使用数组来实现完全二叉树 */
class Heap {
  constructor(k) {

linx4200

var decoder = (function () {
    var canvas, ctx;
    var init = function () {
        var list = document.getElementsByClassName('encrypted');
        for (var i = 0; i < list.length; i++) {
            var entry = list[i];
            var wrapper = document.createElement('div');
            wrapper.className = 'imagesafe';
            var style = entry.style;
            var pos = 'float:' + (style.float || style.cssFloat) + ';left:' + style.left + 'px;top:' + style.top + 'px;';

linx4200

// method 1:
function sequence(tasks, fn) {
  return tasks.reduce(
    (promise, task) => promise.then(() => fn(task)),
    Promise.resolve()
  )
}

// method 2:
async function taskReducer(promise, action){

linx4200

const flyweight = () => {
  // 已创建的元素
  const created = [];
  // 这个例子是共享 dom 元素
  function create () {
    const dom = document.createElement('div');
    document.getElementById('container').appendChild(dom);
    created.push(dom);
    return dom;
  }

linx4200

const decorator = (input, fn) => {
  const input = document.getElementById(input);
  if (typeof input.onclick === 'function') {
    const oldClickFn = input.onclick;
    input.onclick = () => {
      oldClickFn();
      fn();
    }
  } else {
    input.onclick = fn;

linx4200

var LazySingleton = (function() {
  // 单例实例引用
  var instance = null;
  // 单例
  function Singleton() {
    return {
      publicMethod: function() {},
      publicProperty: '1'
    }
  }

linx4200

var A = {
  Util: {
    util_method1: function() {},
    util_method2: function() {},
    // ...
  },
  Tool: {
    tool_method1: function() {},
    tool_method2: function() {},
    // ...

linx4200

// 安全模式创建的工厂类
var Factory = function(type, content) {
  if (this instanceof Factory) {
    return new this[type](content);
  } else {
    return new Factory(type, content);
  }
}

// 工厂原型中设置创建所有类型数据对象的基类

linx4200

var BasketBall = function () { /* ... */};
var FootBall = function () { /* ... */};
var Tennis = function () { /* ... */};

// 运动工厂
var sportsFactory = function (name) {
  switch(name) {
    case 'NBA':
      return new BasketBall();
    case 'WorldCup':