javaScript实现一个队列的方法
时间：2021-07-28 07:41:40 | 栏目：JavaScript代码 | 点击：次
1.队列是遵循先进先出（FIFO)原则的一组有序的项，队列在尾部添加元素，并从顶部移除元素，最新添加的元素必须排在队列的末尾。生活中常见的例子如排队等。
2.创建一个队列类
class Queue{
constructor(){
this.count = 0;//记录队列的数量
this.lowestCount = 0;//记录当前队列头部的位置
this.items = [];//用来存储元素。
}
}
3.添加元素
enqueue(element){
this.items[this.count] = element;
this.count++;
}
4.删除元素（只删除队列头部）
dequeue(){
if(this.isEmpty()){
return 'queue is null';
}
let resulte = this.items[this.lowestCount];
delete this.items[this.lowestCount];
this.lowestCount++;
return resulte;
}
5.查看队列头部元素
peek(){
return this.items[this.lowestCount];
}
6.判断队列是否为空
isEmpty(){
return this.count - this.lowestCount === 0;
}
7.清除队列的元素
clear(){
this.count = 0;
this.lowestCount = 0;
this.items = [];
}
8.查看队列的长度
size(){
return this.count - this.lowestCount;
}
9.查看队列的所有内容
toString(){
if(this.isEmpty())return "queue is null";
let objString = this.items[this.lowestCount];
for(let i = this.lowestCount+1; i < this.count;i++){
objString = `${objString},${this.items[i]}`;
}
return objString;
}
10.完整代码
class Queue{
constructor(){
this.count = 0;//记录队列的数量
this.lowestCount = 0;//记录当前队列顶部的位置
this.items = [];//用来存储元素。
}
enqueue(element){
this.items[this.count] = element;
this.count++;
}
dequeue(){
if(this.isEmpty()){
return 'queue is null';
}
let resulte = this.items[this.lowestCount];
delete this.items[this.lowestCount];
this.lowestCount++;
return resulte;
}
peek(){
return this.items[this.lowestCount];
}
isEmpty(){
return this.count - this.lowestCount === 0;
}
size(){
return this.count - this.lowestCount;
}
clear(){
this.count = 0;
this.lowestCount = 0;
this.items = [];
}
toString(){
if(this.isEmpty())return "queue is null";
let objString = this.items[this.lowestCount];
for(let i = this.lowestCount+1; i < this.count;i++){
objString = `${objString},${this.items[i]}`;
}
return objString;
}
}
11.运行结果
