function ArrayQueue(){ 
  var arr = []; 
    //入队操作 
  this.push = function(element){ 
    arr.push(element); 
    return true; 
  } 
    //出队操作 
  this.pop = function(){ 
    return arr.shift(); 
  } 
    //获取队首 
  this.getFront = function(){ 
    return arr[0]; 
  } 
    //获取队尾 
  this.getRear = function(){ 
    return arr[arr.length - 1] 
  } 
    //清空队列 
  this.clear = function(){ 
    arr = []; 
  } 
    //获取队长 
  this.size = function(){ 
    return length; 
  } 
}

class Queue {
 dataStore = []
 constructor(){
  this.dataStore=[]
 }
 enqueue(e) {
  this.dataStore.push(e)
  console.warn('入队',this.dataStore);
 }

 dequeue() {
  this.dataStore.shift()
  console.warn('出队',this.dataStore);
 }

 front() {
  console.log(this.dataStore,'front')
  return this.dataStore[0]()
 }
 select(){
  return this.dataStore[0]
 }

 back() {
  return this.dataStore[this.dataStore.length - 1]
 }

 isEmpty() {
  if (this.dataStore.length == 0) {
   return true
  }
  return false
 }

 toString() {
  return this.dataStore.join(',')
 }
}

export default Queue

const pushDialog = (eventName) => {
 if (queue.isEmpty()) {
  queue.enqueue(eventName);
  openDialog();
 } else {
  queue.enqueue(eventName);
 }
}
const openDialog = () => {
 // 打开弹窗
 queue.front();
}