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数组 Array
数组去重
function noRepeat(arr) { return [...new Set(arr)];}查找数组最大
function arrayMax(arr) { return Math.max(...arr);}查找数组最小
function arrayMin(arr) { return Math.min(...arr);}返回已 size 为长度的数组宰割的原数组
function chunk(arr, size = 1) { return Array.from( { length: Math.ceil(arr.length / size), }, (v, i) => arr.slice(i * size, i * size + size) );}查看数组中某元素呈现的次数
function countOccurrences(arr, value) { return arr.reduce((a, v) => (v === value ? a + 1 : a + 0), 0);}扁平化数组
- 默认 depth 全副开展
function flatten(arr, depth = -1) { if (depth === -1) { return [].concat( ...arr.map((v) => (Array.isArray(v) ? this.flatten(v) : v)) ); } if (depth === 1) { return arr.reduce((a, v) => a.concat(v), []); } return arr.reduce( (a, v) => a.concat(Array.isArray(v) ? this.flatten(v, depth - 1) : v), [] );}比照两个数组并且返回其中不同的元素
function diffrence(arrA, arrB) { return arrA.filter((v) => !arrB.includes(v));}返回两个数组中雷同的元素
function intersection(arr1, arr2) { return arr2.filter((v) => arr1.includes(v));}从右删除 n 个元素
function dropRight(arr, n = 0) { return n < arr.length ? arr.slice(0, arr.length - n) : [];}截取第一个符合条件的元素及其当前的元素
function dropElements(arr, fn) { while (arr.length && !fn(arr[0])) arr = arr.slice(1); return arr;}返回数组中下标距离 nth 的元素
function everyNth(arr, nth) { return arr.filter((v, i) => i % nth === nth - 1);}返回数组中第 n 个元素
- 反对正数
function nthElement(arr, n = 0) { return (n >= 0 ? arr.slice(n, n + 1) : arr.slice(n))[0];}返回数组头元素
function head(arr) { return arr[0];}返回数组开端元素
function last(arr) { return arr[arr.length - 1];}数组乱排
function shuffle(arr) { let array = arr; let index = array.length; while (index) { index -= 1; let randomInedx = Math.floor(Math.random() * index); let middleware = array[index]; array[index] = array[randomInedx]; array[randomInedx] = middleware; } return array;}浏览器对象 BOM
判读浏览器是否反对 CSS 属性
/** * 告知浏览器反对的指定css属性状况 * @param {String} key - css属性，是属性的名字，不须要加前缀 * @returns {String} - 反对的属性状况 */function validateCssKey(key) { const jsKey = toCamelCase(key); // 有些css属性是连字符号造成 if (jsKey in document.documentElement.style) { return key; } let validKey = ""; // 属性名为前缀在js中的模式，属性值是前缀在css中的模式 // 经尝试，Webkit 也可是首字母小写 webkit const prefixMap = { Webkit: "-webkit-", Moz: "-moz-", ms: "-ms-", O: "-o-", }; for (const jsPrefix in prefixMap) { const styleKey = toCamelCase(`${jsPrefix}-${jsKey}`); if (styleKey in document.documentElement.style) { validKey = prefixMap[jsPrefix] + key; break; } } return validKey;}/** * 把有连字符号的字符串转化为驼峰命名法的字符串 */function toCamelCase(value) { return value.replace(/-(\w)/g, (matched, letter) => { return letter.toUpperCase(); });}/** * 查看浏览器是否反对某个css属性值（es6版） * @param {String} key - 查看的属性值所属的css属性名 * @param {String} value - 要查看的css属性值（不要带前缀） * @returns {String} - 返回浏览器反对的属性值 */function valiateCssValue(key, value) { const prefix = ["-o-", "-ms-", "-moz-", "-webkit-", ""]; const prefixValue = prefix.map((item) => { return item + value; }); const element = document.createElement("div"); const eleStyle = element.style; // 利用每个前缀的状况，且最初也要利用上没有前缀的状况，看最初浏览器起效的何种状况 // 这就是最好在prefix里的最初一个元素是'' prefixValue.forEach((item) => { eleStyle[key] = item; }); return eleStyle[key];}/** * 查看浏览器是否反对某个css属性值 * @param {String} key - 查看的属性值所属的css属性名 * @param {String} value - 要查看的css属性值（不要带前缀） * @returns {String} - 返回浏览器反对的属性值 */function valiateCssValue(key, value) { var prefix = ["-o-", "-ms-", "-moz-", "-webkit-", ""]; var prefixValue = []; for (var i = 0; i < prefix.length; i++) { prefixValue.push(prefix[i] + value); } var element = document.createElement("div"); var eleStyle = element.style; for (var j = 0; j < prefixValue.length; j++) { eleStyle[key] = prefixValue[j]; } return eleStyle[key];}function validCss(key, value) { const validCss = validateCssKey(key); if (validCss) { return validCss; } return valiateCssValue(key, value);}- 摘自 https://juejin.im/post/5e58f398f265da574a1eb569
返回以后网页地址
function currentURL() { return window.location.href;}获取滚动条地位
function getScrollPosition(el = window) { return { x: el.pageXOffset !== undefined ? el.pageXOffset : el.scrollLeft, y: el.pageYOffset !== undefined ? el.pageYOffset : el.scrollTop, };}获取 url 中的参数
function getURLParameters(url) { return url .match(/([^?=&]+)(=([^&]*))/g) .reduce( (a, v) => ( (a[v.slice(0, v.indexOf("="))] = v.slice(v.indexOf("=") + 1)), a ), {} );}页面跳转，是否记录在 history 中
function redirect(url, asLink = true) { asLink ? (window.location.href = url) : window.location.replace(url);}滚动条回到顶部动画
function scrollToTop() { const scrollTop = document.documentElement.scrollTop || document.body.scrollTop; if (scrollTop > 0) { window.requestAnimationFrame(scrollToTop); window.scrollTo(0, c - c / 8); } else { window.cancelAnimationFrame(scrollToTop); }}复制文本
function copy(str) { const el = document.createElement("textarea"); el.value = str; el.setAttribute("readonly", ""); el.style.position = "absolute"; el.style.left = "-9999px"; el.style.top = "-9999px"; document.body.appendChild(el); const selected = document.getSelection().rangeCount > 0 ? document.getSelection().getRangeAt(0) : false; el.select(); document.execCommand("copy"); document.body.removeChild(el); if (selected) { document.getSelection().removeAllRanges(); document.getSelection().addRange(selected); }}检测设施类型
function detectDeviceType() { return /Android|webOS|iPhone|iPad|iPod|BlackBerry|IEMobile|Opera Mini/i.test( navigator.userAgent ) ? "Mobile" : "Desktop";}Cookie
增
function setCookie(key, value, expiredays) { var exdate = new Date(); exdate.setDate(exdate.getDate() + expiredays); document.cookie = key + "=" + escape(value) + (expiredays == null ? "" : ";expires=" + exdate.toGMTString());}删
function delCookie(name) { var exp = new Date(); exp.setTime(exp.getTime() - 1); var cval = getCookie(name); if (cval != null) { document.cookie = name + "=" + cval + ";expires=" + exp.toGMTString(); }}查
function getCookie(name) { var arr, reg = new RegExp("(^| )" + name + "=([^;]*)(;|$)"); if ((arr = document.cookie.match(reg))) { return arr[2]; } else { return null; }}日期 Date
工夫戳转换为工夫
- 默认为以后工夫转换后果
- isMs 为工夫戳是否为毫秒
function timestampToTime(timestamp = Date.parse(new Date()), isMs = true) { const date = new Date(timestamp * (isMs ? 1 : 1000)); return `${date.getFullYear()}-${ date.getMonth() + 1 < 10 ? "0" + (date.getMonth() + 1) : date.getMonth() + 1 }-${date.getDate()} ${date.getHours()}:${date.getMinutes()}:${date.getSeconds()}`;}文档对象 DOM
固定滚动条
/** * 性能形容：一些业务场景，如弹框呈现时，须要禁止页面滚动，这是兼容安卓和 iOS 禁止页面滚动的解决方案 */let scrollTop = 0;function preventScroll() { // 存储以后滚动地位 scrollTop = window.scrollY; // 将可滚动区域固定定位，可滚动区域高度为 0 后就不能滚动了 document.body.style["overflow-y"] = "hidden"; document.body.style.position = "fixed"; document.body.style.width = "100%"; document.body.style.top = -scrollTop + "px"; // document.body.style['overscroll-behavior'] = 'none'}function recoverScroll() { document.body.style["overflow-y"] = "auto"; document.body.style.position = "static"; // document.querySelector('body').style['overscroll-behavior'] = 'none' window.scrollTo(0, scrollTop);}判断以后地位是否为页面底部
- 返回值为 true/false
function bottomVisible() { return ( document.documentElement.clientHeight + window.scrollY >= (document.documentElement.scrollHeight || document.documentElement.clientHeight) );}判断元素是否在可视范畴内
- partiallyVisible 为是否为齐全可见
function elementIsVisibleInViewport(el, partiallyVisible = false) { const { top, left, bottom, right } = el.getBoundingClientRect(); return partiallyVisible ? ((top > 0 && top < innerHeight) || (bottom > 0 && bottom < innerHeight)) && ((left > 0 && left < innerWidth) || (right > 0 && right < innerWidth)) : top >= 0 && left >= 0 && bottom <= innerHeight && right <= innerWidth;}获取元素 css 款式
function getStyle(el, ruleName) { return getComputedStyle(el, null).getPropertyValue(ruleName);}进入全屏
function launchFullscreen(element) { if (element.requestFullscreen) { element.requestFullscreen(); } else if (element.mozRequestFullScreen) { element.mozRequestFullScreen(); } else if (element.msRequestFullscreen) { element.msRequestFullscreen(); } else if (element.webkitRequestFullscreen) { element.webkitRequestFullScreen(); }}launchFullscreen(document.documentElement);launchFullscreen(document.getElementById("id")); //某个元素进入全屏退出全屏
function exitFullscreen() { if (document.exitFullscreen) { document.exitFullscreen(); } else if (document.msExitFullscreen) { document.msExitFullscreen(); } else if (document.mozCancelFullScreen) { document.mozCancelFullScreen(); } else if (document.webkitExitFullscreen) { document.webkitExitFullscreen(); }}exitFullscreen();全屏事件
document.addEventListener("fullscreenchange", function (e) { if (document.fullscreenElement) { console.log("进入全屏"); } else { console.log("退出全屏"); }});数字 Number
数字千分位宰割
function commafy(num) { return num.toString().indexOf(".") !== -1 ? num.toLocaleString() : num.toString().replace(/(\d)(?=(?:\d{3})+$)/g, "$1,");}生成随机数
function randomNum(min, max) { switch (arguments.length) { case 1: return parseInt(Math.random() * min + 1, 10); case 2: return parseInt(Math.random() * (max - min + 1) + min, 10); default: return 0; }}交换
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