function noRepeat(arr) {
return [...new Set(arr)];
}
function arrayMax(arr) {
return Math.max(...arr);
}
function arrayMin(arr) {
return Math.min(...arr);
}
function chunk(arr, size = 1) {
return Array.from(
{
length: Math.ceil(arr.length / size),
},
(v, i) => arr.slice(i * size, i * size + size)
);
}
function countOccurrences(arr, value) {
return arr.reduce((a, v) => (v === value ? a + 1 : a + 0), 0);
}
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),
[]
);
}
function diffrence(arrA, arrB) {
return arrA.filter((v) => !arrB.includes(v));
}
function intersection(arr1, arr2) {
return arr2.filter((v) => arr1.includes(v));
}
function dropRight(arr, n = 0) {
return n < arr.length ? arr.slice(0, arr.length - n) : [];
}
function dropElements(arr, fn) {
while (arr.length && !fn(arr[0])) arr = arr.slice(1);
return arr;
}
function everyNth(arr, nth) {
return arr.filter((v, i) => i % nth === nth - 1);
}
function nthElement(arr, n = 0) {
return (n >= 0 ? arr.slice(n, n + 1) : arr.slice(n))[0];
}
function head(arr) {
return arr[0];
}
function last(arr) {
return arr[arr.length - 1];
}
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;
}
/**
* 告知浏览器支持的指定css属性情况
* @param {String} key - css属性,是属性的名字,不需要加前缀
* @returns {String} - 支持的属性情况
*/
function validateCssKey(key) {
const jsKey = toCamelCase(key); // 有些css属性是连字符号形成
if (jsKey in document.documentElement.style) {
return key;
}
let validKey = "";
// 属性名为前缀在js中的形式,属性值是前缀在css中的形式
// 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();
});
}
/**
* 检查浏览器是否支持某个css属性值(es6版)
* @param {String} key - 检查的属性值所属的css属性名
* @param {String} value - 要检查的css属性值(不要带前缀)
* @returns {String} - 返回浏览器支持的属性值
*/
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;
// 应用每个前缀的情况,且最后也要应用上没有前缀的情况,看最后浏览器起效的何种情况
// 这就是最好在prefix里的最后一个元素是''
prefixValue.forEach((item) => {
eleStyle[key] = item;
});
return eleStyle[key];
}
/**
* 检查浏览器是否支持某个css属性值
* @param {String} key - 检查的属性值所属的css属性名
* @param {String} value - 要检查的css属性值(不要带前缀)
* @returns {String} - 返回浏览器支持的属性值
*/
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);
}
function currentURL() {
return window.location.href;
}
function getScrollPosition(el = window) {
return {
x: el.pageXOffset !== undefined ? el.pageXOffset : el.scrollLeft,
y: el.pageYOffset !== undefined ? el.pageYOffset : el.scrollTop,
};
}
function getURLParameters(url) {
return url
.match(/([^?=&]+)(=([^&]*))/g)
.reduce(
(a, v) => (
(a[v.slice(0, v.indexOf("="))] = v.slice(v.indexOf("=") + 1)), a
),
{}
);
}
function redirect(url, asLink = true) {
asLink ? (window.location.href = url) : window.location.replace(url);
}
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);
}
}
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);
}
}
function detectDeviceType() {
return /Android|webOS|iphone|iPad|iPod|BlackBerry|IEMobile|Opera Mini/i.test(
navigator.userAgent
)
? "Mobile"
: "Desktop";
}
function setCookie(key, value, expiredays) {
var exdate = new Date();
exdate.setDate(exdate.getDate() + expiredays);
document.cookie =
key +
"=" +
escape(value) +
(expiredays == null ? "" : ";expires=" + exdate.toGMTString());
}
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();
}
}
function getCookie(name) {
var arr,
reg = new RegExp("(^| )" + name + "=([^;]*)(;|$)");
if ((arr = document.cookie.match(reg))) {
return arr[2];
} else {
return null;
}
}
function timestampToTime(timestamp = Date.parse(new Date()), isMs = true) {
const date = new Date(timestamp * (isMs ? 1 : 1000));
return `${date.getFullYear()}-${
date.getMonth() + 1 < 10 ? "0" + (date.getMonth() + 1) : date.getMonth() + 1
}-${date.getDate()} ${date.getHours()}:${date.getMinutes()}:${date.getSeconds()}`;
}
/**
* 功能描述:一些业务场景,如弹框出现时,需要禁止页面滚动,这是兼容安卓和 IOS 禁止页面滚动的解决方案
*/
let scrollTop = 0;
function preventScroll() {
// 存储当前滚动位置
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);
}
function bottomVisible() {
return (
document.documentElement.clientHeight + window.scrollY >=
(document.documentElement.scrollHeight ||
document.documentElement.clientHeight)
);
}
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;
}
function getStyle(el, ruleName) {
return getComputedStyle(el, null).getPropertyValue(ruleName);
}
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
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();
document.addEventListener("fullscreenchange", function (e) {
if (document.fullscreenElement) {
console.log("进入全屏");
} else {
console.log("退出全屏");
}
});
function commafy(num) {
return num.toString().indexOf(".") !== -1
? num.toLocaleString()
: num.toString().replace(/(d)(?=(?:d{3})+$)/g, "$1,");
}
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;
}
}