js常用函数规整
/*
*获取某一段时间内所有日期
* @param starDay 开始时间
* @param endDay 结束时间
*/
function getDayAll(starDay, endDay) {
var arr = [];
var dates = [];
// 设置两个日期UTC时间
var db = new Date(starDay);
var de = new Date(endDay);
// 获取两个日期GTM时间
var s = db.getTime() - 24 * 60 * 60 * 1000;
var d = de.getTime() - 24 * 60 * 60 * 1000;
// 获取到两个日期之间的每一天的毫秒数
for (var i = s; i <= d;) {
i = i + 24 * 60 * 60 * 1000;
arr.push(parseInt(i))
}
// 获取每一天的时间 YY-MM-DD
for (var j in arr) {
var time = new Date(arr[j]);
var year = time.getFullYear(time);
var mouth = (time.getMonth() + 1) >= 10 ? (time.getMonth() + 1) : ('0' + (time.getMonth() + 1));
var day = time.getDate() >= 10 ? time.getDate() : ('0' + time.getDate());
var YYMMDD = year + '-' + mouth + '-' + day;
dates.push(YYMMDD)
}
return dates
}
//范例
var dataAll = getDayAll('2020-05-18', '2020-08-01');
console.log('dataAll',dataAll)
/**
*
* @param {*} startDate 开始日期
* @param {*} endDate 结束日期
* return 计算间隔天数
*/
function GetDateDiff(startDate, endDate) {
var startTime = new Date(Date.parse(startDate.replace(/-/g, "/"))).getTime();
var endTime = new Date(Date.parse(endDate.replace(/-/g, "/"))).getTime();
var dates = Math.abs((startTime - endTime)) / (1000 * 60 * 60 * 24);
return dates;
}
/**
* 数组元素排序
*/
function sequence(a, b) {
return b - a;
}
let valueNun = [2,5,1,9,4,0,10]
let newValueArr = valueNun.sort(sequence)
console.log('newValueArr',newValueArr)
/**
* 数组元素去重
*/
function unique(arr) {
let hash = [];
for (let i = 0; i < arr.length; i++) {
if (hash.indexOf(arr[i]) === -1) {
hash.push(arr[i]);
}
}
return hash;
}
let nameArr = ['22','33','22']
let newNameArr = unique(nameArr)
colsole.log('newNameArr',newNameArr)
/*
* 获取某个元素下标
* arr: 传入的数组
* obj: 需要获取下标的元素
* */
function getArrayIndex(arr, obj) {
var i = arr.length;
while (i--) {
if (arr[i] === obj) {
return i;
}
}
return -1;
}
/**
* 清除所有未知定时器
*/
//这里的i需要给大一点的数，毕竟你不知道有多少未知定时器
function clearTimeOutFunc() {
for (var i = 1; i < 1000; i++) {
clearTimeout(i);
<!-- clearInterval(i)-->
}
}
/**
* 返回日期数列里与目标数列最近的日期下标器
*/
const getNearestDateIndex = (targetDate, dates) => {
if (!targetDate || !dates) {
throw new Error('Argument(s) is illegal !')
}
if (!dates.length) {
return -1
}
const distances = dates.map(date => Math.abs(date - targetDate))
return distances.indexOf(Math.min(...distances))
}
// e.g.
const targetDate = new Date(2019, 7, 20)
const dates = [
new Date(2018, 0, 1),
new Date(2019, 0, 1),
new Date(2020, 0, 1),
]
getNearestDateIndex(targetDate, dates) // 2
/**
* 返回日期数列里最小的日期
*/
const getMinDate = dates => {
if (!dates) {
throw new Error('Argument(s) is illegal !')
}
if (!dates.length) {
return dates
}
return new Date(Math.min.apply(null, dates)).toISOString()
}
// e.g.
const dates = [
new Date(2018, 3, 10),
new Date(2019, 3, 10),
new Date(2020, 3, 10),
]
getMinDate(dates) // 2018-04-09T16:00:00.000Z
/**
* 打乱数组
*/
const arrayShuffle = array => {
if (!Array.isArray(array)) {
throw new Error('Argument must be an array')
}
let end = array.length
if (!end) {
return array
}
while (end) {
let start = Math.floor(Math.random() * end--)
;[array[start], array[end]] = [array[end], array[start]]
}
return array
}
// e.g.
arrayShuffle([1, 2, 3])
/**
* 判断是否支持webp图片格式
*/
const canUseWebp = () => (document.createElement('canvas').toDataURL('image/webp', 0.5).indexOf('data:image/webp') === 0)
// e.g.
canUseWebp() // 新版的chrome里为true，火狐里为false
/**
* 判断是否是url
*/
const isUrl = str => /^(((ht|f)tps?):\/\/)?[\w-]+(\.[\w-]+)+([\w.,@?^=%&:/~+#-]*[\w@?^=%&/~+#-])?$/.test(str)
// e.g.
isUrl('https://www.baidu.com') // true
isUrl('https://www') // false
/**
* 判断是否是emoji
*/
const isEmoji = str => /(\ud83c[\udf00-\udfff])|(\ud83d[\udc00-\ude4f\ude80-\udeff])|[\u2600-\u2B55]/g.test(str)
// e.g.
isEmoji('🌏') // true
isEmoji('earth') // false
/**
* 连字符转驼峰
*/
const toCamelCase = (str = '', separator = '-') => {
if (typeof str !== 'string') {
throw new Error('Argument must be a string')
}
if (str === '') {
return str
}
const newExp = new RegExp('\\-\(\\w\)', 'g')
return str.replace(newExp, (matched, $1) => {
return $1.toUpperCase()
})
}
// e.g.
toCamelCase('hello-world') // helloWorld
/**
* 驼峰转连字符
*/
const fromCamelCase = (str = '', separator = '-') => {
if (typeof str !== 'string') {
throw new Error('Argument must be a string')
}
if (str === '') {
return str
}
return str.replace(/([A-Z])/g, `${separator}$1`).toLowerCase()
}
// e.g.
fromCamelCase('helloWorld') // hello-world
/**
* 等级判断
*/
const getLevel = (value = 0, ratio = 50, levels = '一二三四五') => {
if (typeof value !== 'number') {
throw new Error('Argument must be a number')
}
const levelHash = '一二三四五'.split('')
const max = levelHash[levelHash.length - 1]
return levelHash[Math.floor(value / ratio)] || max
}
// e.g.
getLevel1(0) // 一
getLevel1(40) // 一
getLevel(77) // 二
/**
* 事件模拟触发
*/
const event = new Event('click')
const body = document.querySelector('body')
body.addEventListener('click', ev => {
console.log('biu')
}, false)
body.addEventListener('touchmove', ev => {
body.dispatchEvent(event)
}, false)
// 这时候在移动端下滑动手指的时候就会触发click事件
/**
* 判断dom是否相等
*/
const isEqualNode = (dom1, dom2) => dom1.isEqualNode(dom2)
/*
<div>这是第一个div</div>
<div>这是第二个div</div>
<div>这是第一个div</div>
*/
const [一, 二, 三,] = document.getElementsByTagName('div')
// e.g.
isEqualNode(一, 二) // false
isEqualNode(一, 三) // true
isEqualNode(二, 三) // false
/**
* 多属性双向绑定
*/
/*
<div id="box" class="box" style="border: 1px solid; width: 100px; height: 100px;"></div>
<output id="ouput" name="output"></output>
*/
const keys = Object
.values(box.attributes)
.map(({name, value}) => ({name, value}))
const cacheData = {}
const properties = keys.reduce((acc, cur) => {
const obj = {}
cacheData[cur.name] = box.attributes[cur.name]
obj[cur.name] = {
get() {
return cacheData[cur.name]
},
set(data) {
output.value = `${cur.name}: ${data}`
cacheData[cur.name] = data
}
}
return {
...acc,
...obj
}
}, {})
Object.defineProperties(box, properties)
// 当我们修改input相应的属性时，output文字就会变成修改的内容
/**
* 获取指定范围内的随机数
*/
const getRandom = (min = 0, max = 100) => {
if (typeof min !== 'number' || typeof max !== 'number') {
throw new Error('Argument(s) is illegal !')
}
if (min > max) {
[min, max] = [max, min]
}
return Math.floor(Math.random() * (max - min + 1) + min)
}
// e.g.
getRandom(1, 100) // 89
getRandom(1, 100) // 5
/**
* 文件尺寸格式化
*/
const formatSize = size => {
if (typeof +size !== 'number') {
throw new Error('Argument(s) is illegal !')
}
const unitsHash = 'B,KB,MB,GB'.split(',')
let index = 0
while (size > 1024 && index < unitsHash.length) {
size /= 1024
index++
}
return Math.round(size * 100) / 100 + unitsHash[index]
}
formatSize('10240') // 10KB
formatSize('10240000') // 9.77MB
/**
* 获取数组前/后指定数量元素
*/
const arrayRange = (array, index, distance = '+') => {
if (!Array.isArray(array) || typeof index !== 'number' || index < 0) {
throw new TypeError('Argument(s) is illegal');
}
return arr.slice(0, `${distance}${index}`)
}
arrayRange(['a', 'b', 'c'], 2) // ["a", "b"]
arrayRange(['a', 'b', 'c'], 2, '-') // ["a"]
操作数组元素，置顶div
function onToppingClick(index: any) {
let seq = 1;
for (let i = 0; i < showIdsArr.length; i++) {
let c = index === i ? 0 : seq;
showIdsArr[i].key = c;
let maxtop = (showIdsArr.length - c) * 30
let maxleft = c * 20
showIdsArr[i].sty = { ...showIdsArr[i].sty, position: "absolute", top: maxtop, left: maxleft, zIndex: 99 - c };
if (index !== i) {
seq++;
}
}
setShowArr([...showIdsArr]);
// console.table(showIdsArr);
}