/** * [Queue] * @param {[Int]} size [隊列大小] */function Queue(size) {  var list = [];  //向隊列中添加數(shù)據(jù)  this.push = function(data) {    if (data==null) {      return false;    }    //如果傳遞了size參數(shù)就設(shè)置了隊列的大小    if (size != null && !isNaN(size)) {      if (list.length == size) {        this.pop();      }    }    list.unshift(data);    return true;  }  //從隊列中取出數(shù)據(jù)  this.pop = function() {    return list.pop();  }  //返回隊列的大小  this.size = function() {    return list.length;  }  //返回隊列的內(nèi)容  this.quere = function() {    return list;  }}//初始化沒有參數(shù)的隊列var queue = new Queue();for (var i = 1; i <= 5; i++) {  queue.push(i);}console.log(queue.quere());console.log(queue.pop());  //從隊列中取出一個console.log(queue.quere());var queue = new Queue(3);for (var i = 1; i <= 5; i++) {  queue.push(i);}console.log(queue.quere());console.log(queue.pop());console.log(queue.quere());

[ 5, 4, 3, 2, 1 ]1[ 5, 4, 3, 2 ][ 5, 4, 3 ]3[ 5, 4 ]