/*一個用數組實現的隊列*/function Queue(){  this.dataStore = [];//存放隊列的數組，初始化為空  this.enqueue = enqueue;//向隊列尾部添加一個元素  this.dequeue = dequeue;//刪除隊首的元素  this.theFront = theFront;//讀取隊首的元素  this.back = back;//對取隊尾的元素  this.toStrings = toStrings;//顯示隊列內的所有元素  this.empty = empty;//判斷隊列是否為空}function enqueue(element){  this.dataStore.push(element);}function dequeue(){  this.dataStore.shift();}function theFront(){  return this.dataStore[0];}function back(){  return this.dataStore[this.dataStore.length-1];}function toStrings(){  return this.dataStore;}function empty(){  if(this.dataStore.length == 0){    return true;  }else{    return false;  }}/*測試程序*/var q = new Queue();q.enqueue("aa");q.enqueue("bb");q.enqueue("cc");console.log(q.toStrings());//[ 'aa', 'bb', 'cc' ]q.dequeue();console.log(q.toStrings());//[ 'bb', 'cc' ]console.log(q.theFront());//bbconsole.log(q.back());//cc