33个JavaScript常用函数封装方法汇总
来源 | http://www.fly63.com/article/detial/10362
这是我在实际开发中常用的一些js函数方法,今天总结了一下,以便以后查询,有需要的小伙伴可以参考下。
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1、加载js || css || style
const loadRes = function(name, type, fn) { // 加载js || css || style
let ref
if (type === 'js') { // 外部js
ref = document.createElement('script')
ref.setAttribute('type', 'text/JavaScript')
ref.setAttribute('src', name)
} else if (type === 'css') { // 外部css
ref = document.createElement('link')
ref.setAttribute('rel', 'stylesheet')
ref.setAttribute('type', 'text/css')
ref.setAttribute('href', name)
} else if (type === 'style') { // style
ref = document.createElement('style')
ref.innerhtml = name
}
if (typeof ref !== 'undefined') {
document.getElementsByTagName('head')[0].appendChild(ref)
ref.onload = function() { // 加载完成执行
typeof fn === 'function' && fn()
}
}
}
2、获取url参数
const getUrlParam = function(name) { // 获取url参数
let reg = new RegExp('(^|&?)' + name + '=([^&]*)(&|$)', 'i')
let r = window.location.href.substr(1).match(reg)
if (r != null) {
return decodeURI(r[2])
}
return undefined
}
3、本地存储
const store = { // 本地存储
set: function(name, value, day) { // 设置
let d = new Date()
let time = 0
day = (typeof(day) === 'undefined' || !day) ? 1 : day // 时间,默认存储1天
time = d.setHours(d.getHours() + (24 * day)) // 毫秒
localStorage.setItem(name, JSON.stringify({
data: value,
time: time
}))
},
get: function(name) { // 获取
let data = localStorage.getItem(name)
if (!data) {
return null
}
let obj = JSON.parse(data)
if (new Date().getTime() > obj.time) { // 过期
localStorage.removeItem(name)
return null
} else {
return obj.data
}
},
clear: function(name) { // 清空
if (name) { // 删除键为name的缓存
localStorage.removeItem(name)
} else { // 清空全部
localStorage.clear()
}
}
}
4、cookie操作【set,get,del】
const cookie = { // cookie操作【set,get,del】
set: function(name, value, day) {
let oDate = new Date()
oDate.setDate(oDate.getDate() + (day || 30))
document.cookie = name + '=' + value + ';expires=' + oDate + "; path=/;"
},
get: function(name) {
let str = document.cookie
let arr = str.split('; ')
for (let i = 0; i < arr.length; i++) {
let newArr = arr[i].split('=')
if (newArr[0] === name) {
return newArr[1]
}
}
},
del: function(name) {
this.set(name, '', -1)
}
}
5、Js获取元素样式【支持内联】
const getRealStyle = function(obj, styleName) { // Js获取元素样式【支持内联】
var realStyle = null
if (obj.currentStyle) {
realStyle = obj.currentStyle[styleName]
} else if (window.getComputedStyle) {
realStyle = window.getComputedStyle(obj, null)[styleName]
}
return realStyle
}
6、时间格式化
const formatDate = function(fmt, date) { // 时间格式化 【'yyyy-MM-dd hh:mm:ss',时间】
if (typeof date !== 'object') {
date = !date ? new Date() : new Date(date)
}
var o = {
'M+': date.getMonth() + 1, // 月份
'd+': date.getDate(), // 日
'h+': date.getHours(), // 小时
'm+': date.getMinutes(), // 分
's+': date.getSeconds(), // 秒
'q+': Math.floor((date.getMonth() + 3) / 3), // 季度
'S': date.getMilliseconds() // 毫秒
}
if (/(y+)/.test(fmt)) {
fmt = fmt.replace(RegExp.$1, (date.getFullYear() + '').substr(4 - RegExp.$1.length))
}
for (var k in o) {
if (new RegExp('(' + k + ')').test(fmt)) {
fmt = fmt.replace(RegExp.$1, (RegExp.$1.length === 1) ? (o[k]) : (('00' + o[k]).substr(('' + o[k]).length)))
}
}
return fmt
}
7、原生ajax操作
const ajax = function(conf) { // ajax操作
let url = conf.url,
data = conf.data,
senData = [], // 封装后的数据
async = conf.async !== undefined ? conf.async : true, // ture为异步请求
type = conf.type || 'get', // 默认请求方式get
dataType = conf.dataType || 'json',
contenType = conf.contenType || 'application/x-www-form-urlencoded',
success = conf.success,
error = conf.error,
isForm = conf.isForm || false, // 是否formdata
header = conf.header || {}, // 头部信息
xhr = '' // 创建ajax引擎对象
if (data == null) {
senData = ''
} else if (typeof data === 'object' && !isForm) { // 如果data是对象,转换为字符串
for (var k in data) {
senData.push(encodeURIComponent(k) + '=' + encodeURIComponent(data[k]))
}
senData = senData.join('&')
} else {
senData = data
}
try {
xhr = new ActiveXObject('microsoft.xmlhttp') // IE内核系列浏览器
} catch (e1) {
try {
xhr = new XMLHttpRequest() // 非IE内核浏览器
} catch (e2) {
if (error != null) {
error('不支持ajax请求')
}
}
};
xhr.open(type, type !== 'get' ? url : url + '?' + senData, async)
if (type !== 'get' && !isForm) {
xhr.setRequestHeader('content-type', contenType)
}
for (var h in header) {
xhr.setRequestHeader(h, header[h])
}
xhr.send(type !== 'get' ? senData : null)
xhr.onreadystatechange = function() {
if (xhr.readyState === 4) {
if (xhr.status >= 200 && xhr.status < 300) {
if (dataType === 'json' && success != null) {
let res = ''
try {
res = eval('(' + xhr.responseText + ')')
} catch (e) {
console.log(e)
}
success(res) // 将json字符串转换为js对象
};
} else {
if (error != null) {
error('通讯失败!' + xhr.status)
}
}
}
}
}
8、fetch请求的封装
const fetch = function(url, setting) { // fetch请求的封装
let opts = { // 设置参数的初始值
method: (setting.method || 'GET').toUpperCase(), // 请求方式
headers: setting.headers || {}, // 请求头设置
credentials: setting.credentials || true, // 设置cookie是否一起发送
body: setting.body || {},
mode: setting.mode || 'no-cors', // 可以设置 cors, no-cors, same-origin
redirect: setting.redirect || 'follow', // follow, error, manual
cache: setting.cache || 'default' // 设置 cache 模式 (default, reload, no-cache)
}
let dataType = setting.dataType || 'json' // 解析方式
let data = setting.data || '' // 参数
let paramsFormat = function(obj) { // 参数格式
var str = ''
for (var i in obj) {
str += `${i}=${obj[i]}&`
}
return str.split('').slice(0, -1).join('')
}
if (opts.method === 'GET') {
url = url + (data ? `?${paramsFormat(data)}` : '')
} else {
setting.body = data || {}
}
return new Promise((resolve, reject) => {
fetch(url, opts).then(async res => {
let data = dataType === 'text' ? await res.text() : dataType === 'blob' ? await res.blob() : await res.json()
resolve(data)
}).catch(e => {
reject(e)
})
})
}
9、设备判断:android、ios、web
const isDevice = function() { // 判断是android还是ios还是web
var ua = navigator.userAgent.toLowerCase()
if (ua.match(/iPhone\sOS/i) === 'iphone os' || ua.match(/iPad/i) === 'ipad') { // ios
return 'iOS'
}
if (ua.match(/Android/i) === 'android') {
return 'Android'
}
return 'Web'
}
10、判断是否为微信
const isWx = function() { // 判断是否为微信
var ua = window.navigator.userAgent.toLowerCase()
if (ua.match(/MicroMessenger/i) === 'micromessenger') {
return true
}
return false
}
11、文本复制功能
const copyTxt = function(text, fn) { // 复制功能
if (typeof document.execCommand !== 'function') {
console.log('复制失败,请长按复制')
return
}
var dom = document.createElement('textarea')
dom.value = text
dom.setAttribute('style', 'display: block;width: 1px;height: 1px;')
document.body.appendChild(dom)
dom.select()
var result = document.execCommand('copy')
document.body.removeChild(dom)
if (result) {
console.log('复制成功')
typeof fn === 'function' && fn()
return
}
if (typeof document.createRange !== 'function') {
console.log('复制失败,请长按复制')
return
}
var range = document.createRange()
var div = document.createElement('div')
div.innerhtml = text
div.setAttribute('style', 'height: 1px;fontSize: 1px;overflow: hidden;')
document.body.appendChild(div)
range.selectNode(div)
var selection = window.getSelection()
console.log(selection)
if (selection.rangeCount > 0) {
selection.removeAllRanges()
}
selection.addRange(range)
document.execCommand('copy')
typeof fn === 'function' && fn()
console.log('复制成功')
}
12、判断是否是一个数组
const isArray = function(arr) { // 判断是否是一个数组
return Object.prototype.toString.call(arr) === '[object Array]'
}
13、判断两个数组是否相等
const arrayEqual = function(arr1, arr2) { //判断两个数组是否相等
if (arr1 === arr2) return true;
if (arr1.length != arr2.length) return false;
for (let i = 0; i < arr1.length; ++i) {
if (arr1[i] !== arr2[i]) return false;
}
return true;
}
14、时间与时间戳转换
const stamp = { // 时间,时间戳转换
getTime: function(time) { // 时间转10位时间戳
let date = time ? new Date(time) : new Date()
return Math.round(date.getTime() / 1000)
},
timeToStr: function(time, fmt) { // 10位时间戳转时间
return new Date(time * 1000).pattern(fmt || 'yyyy-MM-dd')
}
}
15、常用正则验证
const checkStr = function(str, type) { // 常用正则验证,注意type大小写
switch (type) {
case 'phone': // 手机号码
return /^1[3|4|5|6|7|8|9][0-9]{9}$/.test(str)
case 'tel': // 座机
return /^(0\d{2,3}-\d{7,8})(-\d{1,4})?$/.test(str)
case 'card': // 身份证
return /(^\d{15}$)|(^\d{18}$)|(^\d{17}(\d|X|x)$)/.test(str)
case 'pwd': // 密码以字母开头,长度在6~18之间,只能包含字母、数字和下划线
return /^[a-zA-Z]\w{5,17}$/.test(str)
case 'postal': // 邮政编码
return /[1-9]\d{5}(?!\d)/.test(str)
case 'QQ': // QQ号
return /^[1-9][0-9]{4,9}$/.test(str)
case 'email': // 邮箱
return /^[\w-]+(\.[\w-]+)*@[\w-]+(\.[\w-]+)+$/.test(str)
case 'money': // 金额(小数点2位)
return /^\d*(?:\.\d{0,2})?$/.test(str)
case 'URL': // 网址
return /(http|ftp|https):\/\/[\w\-_]+(\.[\w\-_]+)+([\w\-\.,@?^=%&:/~\+#]*[\w\-\@?^=%&/~\+#])?/.test(str)
case 'IP': // IP
return /((?:(?:25[0-5]|2[0-4]\\d|[01]?\\d?\\d)\\.){3}(?:25[0-5]|2[0-4]\\d|[01]?\\d?\\d))/.test(str)
case 'date': // 日期时间
return /^(\d{4})\-(\d{2})\-(\d{2}) (\d{2})(?:\:\d{2}|:(\d{2}):(\d{2}))$/.test(str) ||
/^(\d{4})\-(\d{2})\-(\d{2})$/.test(str)
case 'number': // 数字
return /^[0-9]$/.test(str)
case 'english': // 英文
return /^[a-zA-Z]+$/.test(str)
case 'chinese': // 中文
return /^[\u4E00-\u9FA5]+$/.test(str)
case 'lower': // 小写
return /^[a-z]+$/.test(str)
case 'upper': // 大写
return /^[A-Z]+$/.test(str)
case 'HTML': // HTML标记
return /<("[^"]*"|'[^']*'|[^'">])*>/.test(str)
default:
return true
}
}
16、是否为PC端
const isPC = function() { // 是否为PC端
let userAgentInfo = navigator.userAgent
let Agents = ['Android', 'iPhone', 'SymbianOS', 'Windows Phone', 'iPad', 'iPod']
let flag = true
for (let v = 0; v < Agents.length; v++) {
if (userAgentInfo.indexOf(Agents[v]) > 0) {
flag = false
break
}
}
return flag
}
17、去除字符串空格
const trim = function(str, type) { // 去除空格, type: 1-所有空格 2-前后空格 3-前空格 4-后空格
type = type || 1
switch (type) {
case 1:
return str.replace(/\s+/g, '')
case 2:
return str.replace(/(^\s*)|(\s*$)/g, '')
case 3:
return str.replace(/(^\s*)/g, '')
case 4:
return str.replace(/(\s*$)/g, '')
default:
return str
}
}
18、字符串大小写转换
const changeCase = function(str, type) { // 字符串大小写转换 type: 1:首字母大写 2:首页母小写 3:大小写转换 4:全部大写 5:全部小写
type = type || 4
switch (type) {
case 1:
return str.replace(/\b\w+\b/g, function(word) {
return word.substring(0, 1).toUpperCase() + word.substring(1).toLowerCase()
})
case 2:
return str.replace(/\b\w+\b/g, function(word) {
return word.substring(0, 1).toLowerCase() + word.substring(1).toUpperCase()
})
case 3:
return str.split('').map(function(word) {
if (/[a-z]/.test(word)) {
return word.toUpperCase()
} else {
return word.toLowerCase()
}
}).join('')
case 4:
return str.toUpperCase()
case 5:
return str.toLowerCase()
default:
return str
}
}
19、过滤html代码
const filterTag = function(str) { // 过滤html代码(把<>转换)
str = str.replace(/&/ig, '&')
str = str.replace(/</ig, '<')
str = str.replace(/>/ig, '>')
str = str.replace(' ', ' ')
return str
}
20、生成随机数范围
const random = function(min, max) { // 生成随机数范围
if (arguments.length === 2) {
return Math.floor(min + Math.random() * ((max + 1) - min))
} else {
return null
}
}
21、阿拉伯数字转中文大写数字
const numberToChinese = function(num) { // 将阿拉伯数字翻译成中文的大写数字
let AA = new Array('零', '一', '二', '三', '四', '五', '六', '七', '八', '九', '十')
let BB = new Array('', '十', '百', '仟', '萬', '億', '点', '')
let a = ('' + num).replace(/(^0*)/g, '').split('.')
let k = 0
let re = ''
for (let i = a[0].length - 1; i >= 0; i--) {
switch (k) {
case 0:
re = BB[7] + re
break
case 4:
if (!new RegExp('0{4}//d{' + (a[0].length - i - 1) + '}$').test(a[0])) {
re = BB[4] + re
}
break
case 8:
re = BB[5] + re
BB[7] = BB[5]
k = 0
break
}
if (k % 4 === 2 && a[0].charAt(i + 2) !== 0 && a[0].charAt(i + 1) === 0) {
re = AA[0] + re
}
if (a[0].charAt(i) !== 0) {
re = AA[a[0].charAt(i)] + BB[k % 4] + re
}
k++
}
if (a.length > 1) { // 加上小数部分(如果有小数部分)
re += BB[6]
for (let i = 0; i < a[1].length; i++) {
re += AA[a[1].charAt(i)]
}
}
if (re === '一十') {
re = '十'
}
if (re.match(/^一/) && re.length === 3) {
re = re.replace('一', '')
}
return re
}
22、原生dom操作
const dom = {
$: function(selector) {
let type = selector.substring(0, 1)
if (type === '#') {
if (document.querySelecotor) return document.querySelector(selector)
return document.getElementById(selector.substring(1))
} else if (type === '.') {
if (document.querySelecotorAll) return document.querySelectorAll(selector)
return document.getElementsByClassName(selector.substring(1))
} else {
return document['querySelectorAll' ? 'querySelectorAll' : 'getElementsByTagName'](selector)
}
},
hasClass: function(ele, name) { /* 检测类名 */
return ele.className.match(new RegExp('(\\s|^)' + name + '(\\s|$)'))
},
addClass: function(ele, name) { /* 添加类名 */
if (!this.hasClass(ele, name)) ele.className += ' ' + name
},
removeClass: function(ele, name) { /* 删除类名 */
if (this.hasClass(ele, name)) {
let reg = new RegExp('(\\s|^)' + name + '(\\s|$)')
ele.className = ele.className.replace(reg, '')
}
},
replaceClass: function(ele, newName, oldName) { /* 替换类名 */
this.removeClass(ele, oldName)
this.addClass(ele, newName)
},
siblings: function(ele) { /* 获取兄弟节点 */
console.log(ele.parentNode)
let chid = ele.parentNode.children,
eleMatch = []
for (let i = 0, len = chid.length; i < len; i++) {
if (chid[i] !== ele) {
eleMatch.push(chid[i])
}
}
return eleMatch
},
getByStyle: function(obj, name) { /* 获取行间样式属性 */
if (obj.currentStyle) {
return obj.currentStyle[name]
} else {
return getComputedStyle(obj, false)[name]
}
},
domToStirng: function(htmlDOM) { /* DOM转字符串 */
var div = document.createElement('div')
div.appendChild(htmlDOM)
return div.innerHTML
},
stringToDom: function(htmlString) { /* 字符串转DOM */
var div = document.createElement('div')
div.innerHTML = htmlString
return div.children[0]
}
}
23、判断图片加载完成
const imgLoadAll = function(arr, callback) { // 图片加载
let arrImg = []
for (let i = 0; i < arr.length; i++) {
let img = new Image()
img.src = arr[i]
img.onload = function() {
arrImg.push(this)
if (arrImg.length == arr.length) {
callback && callback()
}
}
}
}
24、音频加载完成操作
const loadAudio = function(src, callback) { // 音频加载
var audio = new Audio(src)
audio.onloadedmetadata = callback
audio.src = src
}
25、光标所在位置插入字符
const insertAtCursor = function(dom, val) { // 光标所在位置插入字符
if (document.selection) {
dom.focus()
let sel = document.selection.createRange()
sel.text = val
sel.select()
} else if (dom.selectionStart || dom.selectionStart == '0') {
let startPos = dom.selectionStart
let endPos = dom.selectionEnd
let restoreTop = dom.scrollTop
dom.value = dom.value.substring(0, startPos) + val + dom.value.substring(endPos, dom.value.length)
if (restoreTop > 0) {
dom.scrollTop = restoreTop
}
dom.focus()
dom.selectionStart = startPos + val.length
dom.selectionEnd = startPos + val.length
} else {
dom.value += val
dom.focus()
}
}
26、图片地址转base64
const getBase64 = function(img) { //传入图片路径,返回base64,使用getBase64(url).then(function(base64){},function(err){});
let getBase64Image = function(img, width, height) { //width、height调用时传入具体像素值,控制大小,不传则默认图像大小
let canvas = document.createElement("canvas");
canvas.width = width ? width : img.width;
canvas.height = height ? height : img.height;
let ctx = canvas.getContext("2d");
ctx.drawImage(img, 0, 0, canvas.width, canvas.height);
let dataURL = canvas.toDataURL();
return dataURL;
}
let image = new Image();
image.crossOrigin = '';
image.src = img;
let deferred = $.Deferred();
if (img) {
image.onload = function() {
deferred.resolve(getBase64Image(image));
}
return deferred.promise();
}
}
27、base64图片下载功能
const downloadFile = function(base64, fileName) { //base64图片下载功能
let base64ToBlob = function(code) {
let parts = code.split(';base64,');
let contentType = parts[0].split(':')[1];
let raw = window.atob(parts[1]);
let rawLength = raw.length;
let uInt8Array = new Uint8Array(rawLength);
for (let i = 0; i < rawLength; ++i) {
uInt8Array[i] = raw.charCodeAt(i);
}
return new Blob([uInt8Array], {
type: contentType
});
};
let aLink = document.createElement('a');
let blob = base64ToBlob(base64); //new Blob([content]);
let evt = document.createEvent("HTMLEvents");
evt.initEvent("click", true, true); //initEvent不加后两个参数在FF下会报错 事件类型,是否冒泡,是否阻止浏览器的默认行为
aLink.download = fileName;
aLink.href = URL.createObjectURL(blob);
aLink.click();
}
28、浏览器是否支持webP格式图片
const isSupportWebP = function() { //判断浏览器是否支持webP格式图片
return !![].map && document.createElement('canvas').toDataURL('image/webp').indexOf('data:image/webp') == 0;
}
29、url参数转对象
const parseQueryString = function(url) { //url参数转对象
url = !url ? window.location.href : url;
if (url.indexOf('?') === -1) {
return {};
}
let search = url[0] === '?' ? url.substr(1) : url.substring(url.lastIndexOf('?') + 1);
if (search === '') {
return {};
}
search = search.split('&');
let query = {};
for (let i = 0; i < search.length; i++) {
let pair = search[i].split('=');
query[decodeURIComponent(pair[0])] = decodeURIComponent(pair[1] || '');
}
return query;
}
30、对象序列化【对象转url参数】
const stringfyQueryString = function(obj) { //对象序列化【对象转url参数】
if (!obj) return '';
let pairs = [];
for (let key in obj) {
let value = obj[key];
if (value instanceof Array) {
for (let i = 0; i < value.length; ++i) {
pairs.push(encodeURIComponent(key + '[' + i + ']') + '=' + encodeURIComponent(value[i]));
}
continue;
}
pairs.push(encodeURIComponent(key) + '=' + encodeURIComponent(obj[key]));
}
return pairs.join('&');
}
31、H5软键盘缩回、弹起回调
const h5Resize = function(downCb, upCb) { //当软件键盘弹起会改变当前 window.innerHeight,监听这个值变化 [downCb 当软键盘弹起后,缩回的回调,upCb 当软键盘弹起的回调]
var clientHeight = window.innerHeight;
downCb = typeof downCb === 'function' ? downCb : function() {}
upCb = typeof upCb === 'function' ? upCb : function() {}
window.addEventListener('resize', () => {
var height = window.innerHeight;
if (height === clientHeight) {
downCb();
}
if (height < clientHeight) {
upCb();
}
});
}
32、函数防抖
const debounce = function(func, wait, immediate) { //函数防抖[func 函数,wait 延迟执行毫秒数,immediate true 表立即执行,false 表非立即执行,立即执行是触发事件后函数会立即执行,然后n秒内不触发事件才能继续执行函数的效果]
let timeout;
return function() {
let context = this;
let args = arguments;
if (timeout) clearTimeout(timeout);
if (immediate) {
var callNow = !timeout;
timeout = setTimeout(() => {
timeout = null;
}, wait)
if (callNow) func.apply(context, args)
} else {
timeout = setTimeout(function() {
func.apply(context, args)
}, wait);
}
}
}
33、函数节流
const throttle = function(func, wait ,type) { //函数节流 [func 函数 wait 延迟执行毫秒数 type 1 表时间戳版,2 表定时器版]
if(type===1){
let previous = 0;
}else if(type===2){
let timeout;
}
return function() {
let context = this;
let args = arguments;
if(type===1){
let now = Date.now();
if (now - previous > wait) {
func.apply(context, args);
previous = now;
}
}else if(type===2){
if (!timeout) {
timeout = setTimeout(() => {
timeout = null;
func.apply(context, args)
}, wait)
}
}
}
}
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