JavaScript常用的工具函數(shù)分享

第JavaScript常用的工具函數(shù)分享目錄格式化時間戳時間格式化幾分鐘前幾小時前url參數(shù)轉(zhuǎn)為對象對象序列化【對象轉(zhuǎn)url參數(shù)】本地存儲cookie操作數(shù)字格式化單位數(shù)字千位過濾過濾成版本號首字母大寫class操作文本復(fù)制功能判斷是否是一個數(shù)組判斷是否是一個空數(shù)組克隆一個數(shù)組數(shù)組去重是否為PC端判斷是否為微信設(shè)備判斷：android、ios、web常見正則校驗去除字符串空格過濾html代碼生成隨機數(shù)范圍判斷圖片加載完成光標所在位置插入字符圖片地址轉(zhuǎn)base64base64圖片下載功能瀏覽器是否支持webP格式圖片H5軟鍵盤縮回、彈起回調(diào)對象屬性剔除深拷貝函數(shù)防抖函數(shù)節(jié)流前言;

JavaScript(JS)是一種具有函數(shù)優(yōu)先的輕量級，解釋型或即時編譯型的編程語言。雖然它是作為開發(fā)Web頁面的腳本語言而出名的，但是它也被用到了很多非瀏覽器環(huán)境中等等。

格式化時間戳

exportfunctionformatDateTimeStamp(date,fmt){

//格式化時間戳:formatDateTimeStamp(newDate(time),'yyyy-MM-ddhh:mm:ss')

if(/(y+)/.test(fmt)){

fmt=fmt.replace(RegExp.$1,(date.getFullYear()+'').substr(4-RegExp.$1.length))

}

leto={

'M+':date.getMonth()+1,

'd+':date.getDate(),

'h+':date.getHours(),

'm+':date.getMinutes(),

's+':date.getSeconds()

}

for(letkino){

if(newRegExp(`(${k})`).test(fmt)){

letstr=o[k]+''

fmt=fmt.replace(

RegExp.$1,(RegExp.$1.length===1)

str:

padLeftZero(str))

}

}

returnfmt

functionpadLeftZero(str){

return('00'+str).substr(str.length);

exportfunctionparseTime(time,cFormat){

if(arguments.length===0){

returnnull

}

constformat=cFormat||'{y}-{m}-or2p3ii{h}:{i}:{s}'

letdate

if(typeoftime==='object'){

date=time

}else{

if((typeoftime==='string')(/^[0-9]+$/.test(time))){

time=parseInt(time)

}

if((typeoftime==='number')(time.toString().length===10)){

time=time*1000

}

date=newDate(time)

}

constformatObj={

y:date.getFullYear(),

m:date.getMonth()+1,

d:date.getDate(),

h:date.getHours(),

i:date.getMinutes(),

s:date.getSeconds(),

a:date.getDay()

}

consttime_str=format.replace(/{([ymdhisa])+}/g,(result,key)={

constvalue=formatObj[key]

//Note:getDay()returns0onSunday

if(key==='a'){

return['日','一','二','三','四','五','六'][value]

}

returnvalue.toString().padStart(2,'0')

})

returntime_str

}

時間格式化幾分鐘前幾小時前

exportfunctionformatTime(time,option){

if((''+time).length===10){

time=parseInt(time)*1000

}else{

time=+time

}

constd=newDate(time)

constnow=Date.now()

constdiff=(now-d)/1000

if(diff30){

return'剛剛'

}elseif(diff3600){

//less1hour

returnMath.ceil(diff/60)+'分鐘前'

}elseif(diff3600*24){

returnMath.ceil(diff/3600)+'小時前'

}elseif(diff3600*24*2){

return'1天前'

}

if(option){

returnparseTime(time,option)

}else{

return(

d.getMonth()+

1+

'月'+

d.getDate()+

'日'+

d.getHours()+

'時'+

d.getMinutes()+

'分'

)

}

functionpluralize(time,label){

if(time===1){

returntime+label+'ago'

}

returntime+label+'s'+'ago'

exportfunctiontimeAgo(time){

constbetween=Date.now()/1000-Number(time)

if(between3600){

returnpluralize(~~(between/60),'minute')

}elseif(between86400){

returnpluralize(~~(between/3600),'hour')

}else{

returnpluralize(~~(between/86400),'day')

}

}

url參數(shù)轉(zhuǎn)為對象

exportfunctiongetQueryObject(url){

url=url==nullwindow.location.href:url

constsearch=url.substring(url.lastIndexOf('')+1)

constobj={}

constreg=/([^=]+)=([^=]*)/g

search.replace(reg,(rs,$1,$2)={

constname=decodeURIComponent($1)

letval=decodeURIComponent($2)

val=String(val)

obj[name]=val

returnrs

})

returnobj

exportfunctionparam2Obj(url){

constsearch=url.split('')[1]

if(!search){

return{}

}

returnJSON.parse(

'{"'+

decodeURIComponent(search)

.replace(/"/g,'\\"')

.replace(//g,'","')

.replace(/=/g,'":"')

.replace(/\+/g,'')+

'"}'

)

}

對象序列化【對象轉(zhuǎn)url參數(shù)】

functioncleanArray(actual){

constnewArray=[]

for(leti=0;iactual.length;i++){

if(actual[i]){

newArray.push(actual[i])

}

}

returnnewArray

exportfunctionparam(obj){

if(!obj)return''

returncleanArray(

Object.keys(obj).map(key={

if(obj[key]===undefined)return''

returnencodeURIComponent(key)+'='+encodeURIComponent(obj[key])

})

).join('')

exportfunctionstringfyQueryStr(obj){

if(!obj)return'';

letpairs=[];

for(letkeyinobj){

letvalue=obj[key];

if(valueinstanceofArray){

for(leti=0;ivalue.length;++i){

pairs.push(encodeURIComponent(key+'['+i+']')+'='+encodeURIComponent(value[i]));

}

continue;`在這里插入代碼片`

}

pairs.push(encodeURIComponent(key)+'='+encodeURIComponent(obj[key]));

}

returnpairs.join('

param({name:'1111',sex:'wwww'})

stringfyQueryStr({name:'1111',sex:'wwww'})

本地存儲

exportconststore={//本地存儲

set:function(name,value,day){//設(shè)置

letd=newDate()

lettime=0

day=(typeof(day)==='undefined'||!day)1:day//時間,默認存儲1天

time=d.setHours(d.getHours()+(24*day))//毫秒

localStorage.setItem(name,JSON.stringify({

data:value,

time:time

}))

},

get:function(name){//獲取

letdata=localStorage.getItem(name)

if(!data){

returnnull

}

letobj=JSON.parse(data)

if(newDate().getTime()obj.time){//過期

localStorage.removeItem(name)

returnnull

}else{

returnobj.data

}

},

clear:function(name){//清空

if(name){//刪除鍵為name的緩存

localStorage.removeItem(name)

}else{//清空全部

localStorage.clear()

}

}

}

cookie操作

exportconstcookie={//cookie操作【set，get，del】

set:function(name,value,day){

letoDate=newDate()

oDate.setDate(oDate.getDate()+(day||30))

document.cookie=name+'='+value+';expires='+oDate+";path=/;"

},

get:function(name){

letstr=document.cookie

letarr=str.split(';')

for(leti=0;iarr.length;i++){

letnewArr=arr[i].split('=')

if(newArr[0]===name){

returnnewArr[1]

}

}

},

del:function(name){

this.set(name,'',-1)

}

}

數(shù)字格式化單位

exportfunctionnumberFormatter(num,digits)

constsi=[{

value:1E18,

symbol:'E'

},

{

value:1E15,

symbol:'P'

},

{

value:1E12,

symbol:'T'

},

{

value:1E9,

symbol:'G'

},

{

value:1E6,

symbol:'M'

},

{

value:1E3,

symbol:'k'

}

]

for(leti=0;isi.length;i++){

if(num=si[i].value){

return(num/si[i].value).toFixed(digits).replace(/\.0+$|(\.[0-9]*[1-9])0+$/,'$1')+si[i].symbol

}

}

returnnum.toString()

}

數(shù)字千位過濾

exportfunctiontoThousandFilter(num){

lettargetNum=(num||0).toString()

if(targetNum.includes('.')){

letarr=num.split('.')

returnarr[0].replace(/^-\d+/g,m=m.replace(/(=(!\b)(\d{3})+$)/g,','))+'.'+arr[1]

}else{

returntargetNum.replace(/^-\d+/g,m=m.replace(/(=(!\b)(\d{3})+$)/g,','))

}

}

過濾成版本號

exportfunctionversionFilter(versions){

letv0=(versions0xff000000)24

letv1=(versions0xff0000)16

letv2=(versions0xff00)8

letv3=versions0xff

return`${v0}.${v1}.${v2}.${v3}`

}

首字母大寫

exportfunctionuppercaseFirst(string){

returnstring.charAt(0).toUpperCase()+string.slice(1)

}

class操作

exportfunctionhasClass(ele,cls){

return!!ele.className.match(newRegExp('(\\s|^)'+cls+'(\\s|$)'))

exportfunctionaddClass(ele,cls){

if(!hasClass(ele,cls))ele.className+=''+cls

exportfunctionremoveClass(ele,cls){

if(hasClass(ele,cls)){

constreg=newRegExp('(\\s|^)'+cls+'(\\s|$)')

ele.className=ele.className.replace(reg,'')

}

}

文本復(fù)制功能

constcopyTxt=function(text,fn){//復(fù)制功能

if(typeofdocument.execCommand!=='function'){

console.log('復(fù)制失敗，請長按復(fù)制')

return

}

vardom=document.createElement('textarea')

dom.value=text

dom.setAttribute('style','display:block;width:1px;height:1px;')

document.body.appendChild(dom)

dom.select()

varresult=document.execCommand('copy')

document.body.removeChild(dom)

if(result){

console.log('復(fù)制成功')

typeoffn==='function'fn()

return

}

if(typeofdocument.createRange!=='function'){

console.log('復(fù)制失敗，請長按復(fù)制')

return

}

varrange=document.createRange()

vardiv=document.createElement('div')

div.innerhtml=text

div.setAttribute('style','height:1px;fontSize:1px;overflow:hidden;')

document.body.appendChild(div)

range.selectNode(div)

varselection=window.getSelection()

console.log(selection)

if(selection.rangeCount0){

selection.removeAllRanges()

}

selection.addRange(range)

document.execCommand('copy')

typeoffn==='function'fn()

console.log('復(fù)制成功')

}

判斷是否是一個數(shù)組

exportconstcastArray=value=(Array.isArray(value)value:[value])

exportconstcastArray=arr=

Ototype.toString.call(arr)==='[objectArray]'

判斷是否是一個空數(shù)組

exportconstisEmpty=(arr)=!Array.isArray(arr)||arr.length===0

克隆一個數(shù)組

/**

*@param{Array}arr

constclone=(arr)=arr.slice(0);

//Or

constclone=(arr)=[...arr];

//Or

constclone=(arr)=Array.from(arr);

//Or

constclone=(arr)=arr.map((x)=

//Or

constclone=(arr)=JSON.parse(JSON.stringify(arr));

//Or

constclone=(arr)=arr.concat([]);

數(shù)組去重

/**

*@param{Array}arr

*@returns{Array}

exportconstuniqueArray=(arr)=Array.from(newSet(arr))

//Or

exportconstuniqueArray=(arr)=arr.filter((el,i,array)=array.indexOf(el)===i)

//Or

exportconstuniqueArray=(arr)=arr.reduce((acc,el)=(acc.includes(el)acc:[...acc,el]),[])

是否為PC端

exportconstisPC=function(){//是否為PC端

letuserAgentInfo=navigator.userAgent

letAgents=['Android','iPhone','SymbianOS','WindowsPhone','iPad','iPod']

letflag=true

for(letv=0;vAgents.length;v++){

if(userAgentInfo.indexOf(Agents[v])0){

flag=false

break

}

}

returnflag

}

判斷是否為微信

exportconstisWx=()={//判斷是否為微信

varua=window.navigator.userAgent.toLowerCase()

if(ua.match(/MicroMessenger/i)==='micromessenger'){

returntrue

}

returnfalse

}

設(shè)備判斷：android、ios、web

exportconstisDevice=function(){//判斷是android還是ios還是web

varua=navigator.userAgent.toLowerCase()

if(ua.match(/iPhone\sOS/i)==='iphoneos'||ua.match(/iPad/i)==='ipad'){//ios

return'iOS'

}

if(ua.match(/Android/i)==='android'){

return'Android'

}

return'Web'

}

常見正則校驗

/*正則匹配*/

exportconstnormalReg=(str,type)={

switch(type){

case'phone':

//手機號碼

return/^1[3|4|5|6|7|8|9][0-9]{9}$/.test(str);

case'tel':

//座機

return/^(0\d{2,3}-\d{7,8})(-\d{1,4})$/.test(str);

case'card':

//身份證

return/(^\d{15}$)|(^\d{18}$)|(^\d{17}(\d|X|x)$)/.test(str);

case'pwd':

//密碼以字母開頭，長度在6~18之間，只能包含字母、數(shù)字和下劃線

return/^[a-zA-Z]\w{5,17}$/.test(str)

case'postal':

//郵政編碼

return/[1-9]\d{5}(!\d)/.test(str);

case'QQ':

//QQ號

return/^[1-9][0-9]{4,9}$/.test(str);

case'email':

//郵箱

return/^[\w-]+(\.[\w-]+)*@[\w-]+(\.[\w-]+)+$/.test(str);

case'money':

//金額(小數(shù)點2位)

return/^\d*(:\.\d{0,2})$/.test(str);

case'URL':

//網(wǎng)址

return/(http|ftp|https):\/\/[\w\-_]+(\.[\w\-_]+)+([\w\-\.,@^=%:/~\+#]*[\w\-\@^=%/~\+#])/.test(str)

case'IP':

//IP

return/((:(:25[0-5]|2[0-4]\\d|[01]\\d\\d)\\.){3}(:25[0-5]|2[0-4]\\d|[01]\\d\\d))/.test(str);

case'date':

//日期時間

return/^(\d{4})\-(\d{2})\-(\d{2})(\d{2})(:\:\d{2}|:(\d{2}):(\d{2}))$/.test(str)||/^(\d{4})\-(\d{2})\-(\d{2})$/.test(str)

case'number':

//數(shù)字

return/^[0-9]$/.test(str);

case'positiveInteger':

//正整數(shù)

return/^[1-9]\d*$/.test(str);

case'price':

//價格

return/(^[1-9]\d*(\.\d{1,2})$)|(^0(\.\d{1,2})$)/.test(str);//價格非0則去掉''

case'english'://英文

return/^[a-zA-Z]+$/.test(str);

case'chinese'://中文

return/^[\u4E00-\u9FA5]+$/.test(str);

case'lower':

//小寫

return/^[a-z]+$/.test(str);

case'upper':

//大寫

return/^[A-Z]+$/.test(str);

case'HTML':

//HTML標記

return/("[^"]*"|'[^']*'|[^'"])*/.test(str);

default:

returntrue;

}

}

去除字符串空格

exportconsttrim=function(str,type){

type=type||1

switch(type){

case1:

returnstr.replace(/\s+/g,'')

case2:

returnstr.replace(/(^\s*)|(\s*$)/g,'')

case3:

returnstr.replace(/(^\s*)/g,'')

case4:

returnstr.replace(/(\s*$)/g,'')

default:

returnstr

}

}

過濾html代碼

exportconstfilterTag=function(str){//過濾html代碼(把轉(zhuǎn)換)

str=str.replace(//ig,'')

str=str.replace(//ig,'')

str=str.replace(//ig,'')

str=str.replace('','')

returnstr

}

生成隨機數(shù)范圍

exportconstrandom=function(min,max){//生成隨機數(shù)范圍

if(arguments.length===2){

returnMath.floor(min+Math.random()*((max+1)-min))

}else{

returnnull

}

}

判斷圖片加載完成

exportconstimgLoadAll=function(arr,callback){//圖片加載

letarrImg=[]

for(leti=0;iarr.length;i++){

letimg=newImage()

img.src=arr[i]

img.onload=function(){

arrImg.push(this)

if(arrImg.length==arr.length){

callbackcallback()

}

}

}

}

光標所在位置插入字符

exportconstinsertAtCursor=function(dom,val){//光標所在位置插入字符

if(document.selection){

dom.focus()

letsel=document.selection.createRange()

sel.text=val

sel.select()

}elseif(dom.selectionStart||dom.selectionStart=='0'){

letstartPos=dom.selectionStart

letendPos=dom.selectionEnd

letrestoreTop=dom.scrollTop

dom.value=dom.value.substring(0,startPos)+val+dom.value.substring(endPos,dom.value.length)

if(restoreTop0){

dom.scrollTop=restoreTop

}

dom.focus()

dom.selectionStart=startPos+val.length

dom.selectionEnd=startPos+val.length

}else{

dom.value+=val

dom.focus()

}

}

圖片地址轉(zhuǎn)base64

exportconstgetBase64=function(img){

//傳入圖片路徑，返回base64，使用getBase64(url).then(function(base64){},function(err){});

letgetBase64Image=function(img,width,height){

//width、height調(diào)用時傳入具體像素值，控制大小,不傳則默認圖像大小

letcanvas=document.createElement("canvas");

canvas.width=widthwidth:img.width;

canvas.height=heightheight:img.height;

letctx=canvas.getContext("2d");

ctx.drawImage(img,0,0,canvas.width,canvas.height);

letdataURL=canvas.toDataURL();

returndataURL;

}

letimage=newImage();

image.crossOrigin='';

image.src=img;

letdeferred=$.Deferred();

if(img){

image.onload=function(){

deferred.resolve(getBase64Image(image));

}

returnmise();

}

}

base64圖片下載功能

exportconstdownloadFile

=(base64,fileName)={

letbase64ToBlob=(code)={

letparts=code.split(';base64,');

letcontentType=parts[0].split(':')[1];

letraw=window.atob(parts[1]);

letrawLength=raw.length;

letuInt8Array=newUint8Array(rawLength);

for(leti=0;irawLength;++i){

uInt8Array[i]=raw.charCodeAt(i);

}

returnnewBlob([uInt8Array],{

type:contentType

});

};

letaLink=document.createElement('a');

letblob=base64ToBlob(base64);//newBlob([content]);

letevt=document.createEvent("HTMLEvents");

evt.initEvent("click",true,true);

//initEvent不加后兩個參數(shù)在FF下會報錯

事件類型，是否冒泡，是否阻止瀏覽器的默認行為

aLink.download=fileName;

aLink.href=URL.createObjectURL(blob);

aLink.click();

}

瀏覽器是否支持webP格式圖片

exportconstwebPBool=()=!![].map

document.createElement('canvas').toDataURL('image/webp').indexOf('data:image/webp')==0

H5軟鍵盤縮回、彈起回調(diào)

/*當軟件鍵盤彈起會改變當前window.innerHeight

監(jiān)聽這個值變化[downCb當軟鍵盤彈起后，縮回的回調(diào),upCb當軟鍵盤彈起的回調(diào)]*/

exportfunction(downCb,upCb){

varclientHeight=window.innerHeight

downCb=typeofdownCb==='function'downCb:function(){}

upCb=typeofupCb==='function'upCb:function(){}

window.addEventListener('resize',()={

varheight=window.innerHeight

if(height===clientHeight){

downCb()

}

if(heightclientHeight){

upCb()

}

})

}

對象屬性剔除

functionomit(object,props=[]){

letres={}

Object.keys(object).forEach(key={

if(props.includes(key)===false){

res[key]=typeofobject[key]==='object'object[key]!==nulljsON.parse(jsON.stringify(object[key])):object[key]

}

})

returnres

//forexample

letdata={

id:1,

title:'12345',

name:'男'}

omit(data,['id'])

//data---{title:'xxx',name:'男'}

深拷貝

exportfunctiondeepClone(source){

if(!sourcetypeofsource!=='object'){

thrownewError