function Scheduler () { this.concurrency = 2 this.running = 0 this.queue = [] this.add = function (task) { return new Promise(resolve => {

function findeLongestWordInStr (s, d) { if (s && s.length > 0 && d && d.length > 0) { let maxStr = ''; const sort

class EventEmitter { constructor(maxListeners) { this.events = new Map(); this.maxListeners = maxListeners || 10; } _checkParams(event, liste

js埋点上报有多种方式可以选择，但是由于前端浏览器百花齐放的特性兼之各个浏览器对标准API的支持程度