LeeeeeeM

// 实现一个promise 拥有then方法

function noop() {
}

function resolve(promise) {
  return function(value) {
    if (promise._status !== 'pending') {
      return; // 如果是fullfilled或者rejected，不可逆
    }

LeeeeeeM

// 原始方法
function compose(...fns) {
    return function composed(result) {
        var list = fns.slice();
        while(list.length > 0) {
            result = list.pop()(result);
        }
        return result;
    }
}

LeeeeeeM

function express() {

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

LeeeeeeM

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

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

LeeeeeeM

functino mergeSort(array) {
    if (array.length === 1) {
        return array;
    }
    var middle = Math.floor(array.length / 2);
    var leftArray = array.slice(0, middle);
    var rightArray = array.slice(middle);
    return merge(mergeSort(leftArray), mergeSort(rightArray));
}

LeeeeeeM

# 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

LeeeeeeM

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

LeeeeeeM

var timeout = (time, value) => {
    console.log('step into promise', time, value);
    return new Promise(resolve => {
        setTimeout(resolve, time, value);
    });
};

var queue = [2, 3, 5, 99, 1];

var dosth = value => {

LeeeeeeM

// 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）

LeeeeeeM

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