duplicate(arr,type){ var newArr = []; var tArr = []; if(arr.length == 0){ return arr; }else{ if(type){ for(var i = 0; i < arr.length;i++){ if(!tArr[arr[i][type]]){ newArr.push(arr[i]); tArr[arr[i][type]] = true; } } return newArr; }else{ for(var i = 0; i < arr.length;i++){ if(!tArr[arr[i]]){ newArr.push(arr[i]); tArr[arr[i]] = true; } } return newArr; } } },
//判断浏览器是否为pc端浏览器模式 function isPCBroswer(){ let e = navigator.userAgent.toLowerCase(); let t = "ipad" == e.match(/ipad/i); let i = "iphone" == e.match(/iphone/i); let r = "midp" == e.match(/midp/i); let n = "rv:1.2.3.4" == e.match(/rv:1.2.3.4/i); let a = "ucweb" == e.match(/ucweb/i); let o = "android" == e.match(/android/i); let s = "windows ce" == e.match(/windows ce/i); let l = "windows mobile" == e.match(/windows mobile/i); console.log(e); return !(t || i || r || n || a || o || s || l); } console.log(isPCBroswer());
function dateFormater(formater,t){ let date = t?new Date(t):new Date(); let Y = date.getFullYear() + ''; let M = date.getMonth() + 1; let D = date.getDate(); let H = date.getHours(); let m = date.getMinutes(); let s = date.getMinutes(); console.log(Y); console.log(Y.substr(2,2)); return formater.replace(/YYYY|yyyy/g,Y) .replace(/YY|yy/g,Y.substr(2,2)) .replace(/MM/g,(M<10?'0':'') + M) .replace(/DD/g,(D<10?'0':'') + D) .replace(/HH|hh/g,(H<10?'0':'') + H) .replace(/mm/g,(m<10?'0':'') + m) .replace(/ss/g,(s<10?'0':'') + s) } console.log(dateFormater('YYYY-MM-DD HH:mm:ss')); console.log(dateFormater('YYYYMMDDHHmmss')); console.log(dateFormater('YYYY-MM-DD','2018/08/13'));
function GetUrlParams(URL){ let url = URL?URL:document.location.toString(); let arrObj = url.split("?"); let params = Object.create(null); if(arrObj.length > 1){ arrObj = arrObj[1].split("&"); arrObj.forEach(item => { item = item.split("="); params[item[0]] = item[1] }) } return params; } let url = 'http://192.168.0.117:8000/pages/dataView.html?type=1&id=4cbe083006234f51a4b2782368b3f38f&did=3'; console.log(GetUrlParams(url));
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta http-equiv="X-UA-Compatible" content="ie=edge"> <title>全屏和退出全屏</title> <style> :not(:root):-webkit-full-screen::backdrop{ background: #fff !important; } :not(:root):-moz-full-screen::backdrop{ background: #fff !important; } :not(:root):-ms-fullscreen::backdrop{ background: #fff !important; } </style> </head> <body> <button onclick = "toFullScreen()">全屏</button> <button onclick = "exitFullscreen()">退出全屏</button> <script> //全屏 function toFullScreen(){ let elem = document.body; elem.webkitRequestFullScreen ? elem.webkitRequestFullScreen() : elem.mozRequestFullScreen ? elem.mozRequestFullScreen() : elem.msRequestFullscreen ? elem.msRequestFullscreen() : elem.requestFullScreen ? elem.requestFullScreen() : alert("浏览器不支持全屏"); } //退出全屏 function exitFullscreen(){ let elem = parent.document; elem.webkitCancelFullScreen ? elem.webkitCancelFullScreen() : elem.mozCancelFullScreen ? elem.mozCancelFullScreen() : elem.cancelFullScreen ? elem.cancelFullScreen() : elem.msExitFullscreen ? elem.msExitFullscreen() : elem.exitFullscreen ? elem.exitFullscreen() : alert("切换失败,可尝试Esc退出"); } </script> </body> </html>
window.requestAnimationFrame = window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame || window.msRequestAnimationFrame || window.oRequestAnimationFrame || function (callback) { //为了使setTimteout的尽可能的接近每秒60帧的效果 window.setTimeout(callback, 1000 / 60); }; window.cancelAnimationFrame = window.cancelAnimationFrame || Window.webkitCancelAnimationFrame || window.mozCancelAnimationFrame || window.msCancelAnimationFrame || window.oCancelAnimationFrame || function (id) { //为了使setTimteout的尽可能的接近每秒60帧的效果 window.clearTimeout(id); } let num = 0 let tiemr; (function animate(){ num++; console.log(2333,num); timer = requestAnimationFrame(animate); if(num > 10){ cancelAnimationFrame(timer); } //动画 })();
function random(lower,upper){ lower = +lower || 0 upper = +upper || 0 return Math.random()*(upper - lower) + lower; } console.log(random(0,0.5)); console.log(random(2,1)); console.log(random(-2,-1));
['contextmenu', 'selectstart', 'copy'].forEach(function(ev){ document.addEventListener(ev, function(event){ return event.returnValue = false }) });
const round = (n, decimals = 0) => Number(`${Math.round(`${n}e${decimals}`)}e-${decimals}`); console.log(round(1.345,2)); //1.35忽略第二个参数会被四舍五入到一个整数
let cars = ["BMW",'Benz','Tesla','Tesla','BMW','Toyota']; let getNumbers = arr => arr.reduce((obj,name) =>{ obj[name] = obj[name] ? ++obj[name] : 1; return obj; },{}); console.log('哈哈哈',getNumbers(cars));
//判断浏览器是否为微信 function is_weixin() { var ua = navigator.userAgent.toLowerCase(); if(ua.match(/MicroMessenger/i) == "micromessenger") { return true; } else { return false; } }
