普通氣泡排序

function bubbling(arr, isBigSmall) { // arr 陣列 , isBigSmall 是否從大到小排練
    let num = arr.length
    for (let i = 0; i < num; i++) {
        for (let j = 0; j < num; j++) {
            if (arr[j] > arr[j + 1]) {
                let numNumber = arr[j]
                arr[j] = arr[j + 1]
                arr[j 
 
+ 1] = numNumber
            }
        }
    }
    if (isBigSmall || isBigSmall === true) { //從大到小排練
        arr = arr.reverse()
    }
    return arr // 預設從小到大
}

快速排序

function rapidSort(arr, isBigSmall) { // arr 陣列 , isBigSmall 是否從大到小排練
    let left = []
    let right = []
    let center = []
    let arrLength 
 
= arr.length
    for (let i = 0; i < arrLength; i++) {
        if (arr[i] === arr[0]) {
            center.push(arr[i])
        } else if (arr[i] > arr[0]) {
            right.push(arr[i])
        } else {
            left.push(arr[i])
        }
    }
//將陣列分為3部分, 同時進行排練,最後合併
    let leftnew = bubblingSortList(left)
    let rightnew 
 
= bubblingSortList(right)
    let newArr = leftnew.concat(center, rightnew)
    if (isBigSmall || isBigSmall === true) { //從大到小排練
        newArr = newArr.reverse()
    }
    return newArr
}


function bubblingSortList(index) {
    let arrLength = index.length
    for (let i = 0; i < arrLength; i++) {
        for (let j = 0; j < arrLength; j++) {
            if (index[j] > index[j + 1]) {
                let num = index[j]
                index[j] = index[j + 1]
                index[j + 1] = num
            }
        }
    }
    return index
}

常用的陣列去重ES5

function outRepetitionES5(arr) {
    let newArr = []
    for (let i = 0; i < arr.length; i++) {
        if (newArr.indexOf(arr[i]) == -1) {
            newArr.push(arr[i])
        }
    }
    return newArr
}

陣列去重ES6

function outRepetitionES6(arr) {
    return [...new Set(arr)]
}

獲取範圍隨機數

function randomFun(min, max, arrLength) { // min 隨機數最小範圍 ,ma隨機數最大範圍 arrLength[可選引數] 是否以陣列的形式返回多個
    if (arrLength) { // 沒有長度返回單個隨機數
        singleRandomFun(min, max)
    } else { // 返回一個指定長度的陣列,每一個都是隨機數
        let arr = []
        for (let i = 0; i < arrLength;i++) {
            arr.push(singleRandomFun(min, max))
        }
        return arr
    }
}
//獲取單個隨機數
function singleRandomFun(min, max) {
    return Math.floor(Math.random() * (max - min))
}

獲取當前時間格式

function getDate(isTime, separatorFront,separatorDehind) { // isTime 是否需要詳細時間 separatorFront 設定指定分隔符(年月日的) 預設 "-" separatorDehind 設定指定分隔符(時間的) 預設':'
var t = new Date();
var n = t.getFullYear();
var y = bianhuan(t.getMonth() + 1);
var r = bianhuan(t.getDate());
var s = bianhuan(t.getHours());
var f = bianhuan(t.getMinutes());
var m = bianhuan(t.getSeconds());
let front = "-"
let behind = ':'
if (separatorFront) { // 是否自定義設定年月日的分隔符
front = separatorFront
}
if (separatorDehind) { // 是否自定義設定時間的分隔符
behind = separatorDehind
}
if (!isTime) {
var time = `${n}${front}${y}${front}${r}`
} else {
var time = `${n}${front}${y}${front} ${r} ${s}${behind}${f}${behind}${m}`

}
return time;
}
// 加“0”判斷
function bianhuan(s) {
s = s < 10 ? "0" + s : s;
return s;
}

判斷星期幾

function getWeek(getDate) {
    if (/^[0-9]{4}-[0-1]?[0-9]{1}-[0-3]?[0-9]{1}$/.test(getDate)) { // 判斷是日期格式
        let str = '星期'
        let week = getDate.getDay()
        let strNumber = ['一', '二', '三', '四', '五', '六', '日']
        return str + strNumber[week]
    } else {
        return '非日期格式'
    }
}

生成指定位數的驗證碼

function specifiedYZM(numNumber, isLetter) { // 驗證碼長度[numNumber] 是否有字母 [isLetter] 
    if (numNumber) {
        let arr1 = [1, 2, 3, 4, 5, 6, 7, 8, 9, 0]
        let arr2 = '1234567890qwertyuiopasdfghjklzxcvbnm'
        arr2 = arr2.split('')
        let arr = ''
        let arrLength = ''
        let tar = []
        if (isLetter) {
            arr = arr2
            arrLength = arr2.length
        } else {
            arr = arr1
            arrLength = arr1.length
        }
        for (let i = 0; i < numNumber; i++) {
            tar.push(arr[Math.floor(Math.random() * arrLength)])
        }
        tar = tar.join('')
        return tar
    } else {
        return '驗證碼長度不可為空'
    }
}