1.隊(duì)列是遵循先進(jìn)先出（FIFO)原則的一組有序的項(xiàng)，隊(duì)列在尾部添加元素，并從頂部移除元素，最新添加的元素必須排在隊(duì)列的末尾。生活中常見(jiàn)的例子如排隊(duì)等。

2.創(chuàng)建一個(gè)隊(duì)列類

class Queue{ constructor(){ this.count = 0;//記錄隊(duì)列的數(shù)量 this.lowestCount = 0;//記錄當(dāng)前隊(duì)列頭部的位置 this.items = [];//用來(lái)存儲(chǔ)元素。 }}

3.添加元素

enqueue(element){ this.items[this.count] = element; this.count++; }

4.刪除元素（只刪除隊(duì)列頭部）

dequeue(){ if(this.isEmpty()){ return ’queue is null’; } let resulte = this.items[this.lowestCount]; delete this.items[this.lowestCount]; this.lowestCount++; return resulte; }

5.查看隊(duì)列頭部元素

peek(){ return this.items[this.lowestCount]; }

6.判斷隊(duì)列是否為空

isEmpty(){ return this.count - this.lowestCount === 0; }

7.清除隊(duì)列的元素

clear(){ this.count = 0; this.lowestCount = 0; this.items = []; }

8.查看隊(duì)列的長(zhǎng)度

size(){ return this.count - this.lowestCount; }

9.查看隊(duì)列的所有內(nèi)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.完整代碼

class Queue{ constructor(){ this.count = 0;//記錄隊(duì)列的數(shù)量 this.lowestCount = 0;//記錄當(dāng)前隊(duì)列頂部的位置 this.items = [];//用來(lái)存儲(chǔ)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.運(yùn)行結(jié)果

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