javaScript实现一个队列的方法

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

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