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這篇文章主要介紹“原生JavaScript技巧有哪些”,在日常操作中,相信很多人在原生JavaScript技巧有哪些問題上存在疑惑,小編查閱了各式資料,整理出簡(jiǎn)單好用的操作方法,希望對(duì)大家解答”原生JavaScript技巧有哪些”的疑惑有所幫助!接下來,請(qǐng)跟著小編一起來學(xué)習(xí)吧!
1、原生JavaScript實(shí)現(xiàn)字符串長(zhǎng)度截取
function cutstr(str, len) { var temp; var icount = 0; var patrn = /[^\x00-\xff]/; var strre = ""; for (var i = 0; i < str.length; i++) { if (icount < len - 1) { temp = str.substr(i, 1); if (patrn.exec(temp) == null) { icount = icount + 1 } else { icount = icount + 2 } strre += temp } else { break } } return strre + "..." }
2、原生JavaScript獲取域名主機(jī)
function getHost(url) { var host = "null"; if(typeof url == "undefined"|| null == url) { url = window.location.href; } var regex = /^\w+\:\/\/([^\/]*).*/; var match = url.match(regex); if(typeof match != "undefined" && null != match) { host = match[1]; } return host; }
3、原生JavaScript清除空格
String.prototype.trim = function() { var reExtraSpace = /^\s*(.*?)\s+$/; return this.replace(reExtraSpace, "$1") }
4、原生JavaScript替換全部
String.prototype.replaceAll = function(s1, s2) { return this.replace(new RegExp(s1, "gm"), s2) }
5、原生JavaScript轉(zhuǎn)義html標(biāo)簽
function HtmlEncode(text) { return text.replace(/&/g, '&').replace(/\"/g, '"').replace(/</g, '<').replace(/>/g, '>') }
7、原生JavaScript時(shí)間日期格式轉(zhuǎn)換
Date.prototype.Format = function(formatStr) { var str = formatStr; var Week = ['日', '一', '二', '三', '四', '五', '六']; str = str.replace(/yyyy|YYYY/, this.getFullYear()); str = str.replace(/yy|YY/, (this.getYear() % 100) > 9 ? (this.getYear() % 100).toString() : '0' + (this.getYear() % 100)); str = str.replace(/MM/, (this.getMonth() + 1) > 9 ? (this.getMonth() + 1).toString() : '0' + (this.getMonth() + 1)); str = str.replace(/M/g, (this.getMonth() + 1)); str = str.replace(/w|W/g, Week[this.getDay()]); str = str.replace(/dd|DD/, this.getDate() > 9 ? this.getDate().toString() : '0' + this.getDate()); str = str.replace(/d|D/g, this.getDate()); str = str.replace(/hh|HH/, this.getHours() > 9 ? this.getHours().toString() : '0' + this.getHours()); str = str.replace(/h|H/g, this.getHours()); str = str.replace(/mm/, this.getMinutes() > 9 ? this.getMinutes().toString() : '0' + this.getMinutes()); str = str.replace(/m/g, this.getMinutes()); str = str.replace(/ss|SS/, this.getSeconds() > 9 ? this.getSeconds().toString() : '0' + this.getSeconds()); str = str.replace(/s|S/g, this.getSeconds()); return str }
8、原生JavaScript判斷是否為數(shù)字類型
function isDigit(value) { var patrn = /^[0-9]*$/; if (patrn.exec(value) == null || value == "") { return false } else { return true } }
9、原生JavaScript設(shè)置cookie值
function setCookie(name, value, Hours) { var d = new Date(); var offset = 8; var utc = d.getTime() + (d.getTimezoneOffset() * 60000); var nd = utc + (3600000 * offset); var exp = new Date(nd); exp.setTime(exp.getTime() + Hours * 60 * 60 * 1000); document.cookie = name + "=" + escape(value) + ";path=/;expires=" + exp.toGMTString() + ";domain=360doc.com;" }
10、原生JavaScript獲取cookie值
function getCookie(name) { var arr = document.cookie.match(new RegExp("(^| )" + name + "=([^;]*)(;|$)")); if (arr != null) return unescape(arr[2]); return null }
11、原生JavaScript加入收藏夾
function AddFavorite(sURL, sTitle) { try { window.external.addFavorite(sURL, sTitle) } catch(e) { try { window.sidebar.addPanel(sTitle, sURL, "") } catch(e) { alert("加入收藏失敗,請(qǐng)使用Ctrl+D進(jìn)行添加") } } }
12、原生JavaScript設(shè)為首頁
function setHomepage() { if (document.all) { document.body.style.behavior = 'url(#default#homepage)'; document.body.setHomePage('http://www.jq-school.com') } else if (window.sidebar) { if (window.netscape) { try { netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect") } catch(e) { alert("該操作被瀏覽器拒絕,如果想啟用該功能,請(qǐng)?jiān)诘刂窓趦?nèi)輸入 about:config,然后將項(xiàng) signed.applets.codebase_principal_support 值該為true") } } var prefs = Components.classes['@mozilla.org/preferences-service;1'].getService(Components.interfaces.nsIPrefBranch); prefs.setCharPref('browser.startup.homepage', 'http://www.jq-school.com') } }
13、原生JavaScript判斷IE6
var ua = navigator.userAgent.toLowerCase(); var isIE6 = ua.indexOf("msie 6") > -1; if (isIE6) { try { document.execCommand("BackgroundImageCache", false, true) } catch(e) {} }
14、原生JavaScript加載樣式文件
function LoadStyle(url) { try { document.createStyleSheet(url) } catch(e) { var cssLink = document.createElement('link'); cssLink.rel = 'stylesheet'; cssLink.type = 'text/css'; cssLink.href = url; var head = document.getElementsByTagName('head')[0]; head.appendChild(cssLink) } }
15、原生JavaScript返回腳本內(nèi)容
function evalscript(s) { if(s.indexOf('<script') == -1) return s; var p = /<script[^\>]*?>([^\x00]*?)<\/script>/ig; var arr = []; while(arr = p.exec(s)) { var p1 = /<script[^\>]*?src=\"([^\>]*?)\"[^\>]*?(reload=\"1\")?(?:charset=\"([\w\-]+?)\")?><\/script>/i; var arr1 = []; arr1 = p1.exec(arr[0]); if(arr1) { appendscript(arr1[1], '', arr1[2], arr1[3]); } else { p1 = /<script(.*?)>([^\x00]+?)<\/script>/i; arr1 = p1.exec(arr[0]); appendscript('', arr1[2], arr1[1].indexOf('reload=') != -1); } } return s; }
16、原生JavaScript清除腳本內(nèi)容
function stripscript(s) { return s.replace(/<script.*?>.*?<\/script>/ig, ''); }
17、原生JavaScript動(dòng)態(tài)加載腳本文件
function appendscript(src, text, reload, charset) { var id = hash(src + text); if(!reload && in_array(id, evalscripts)) return; if(reload && $(id)) { $(id).parentNode.removeChild($(id)); } evalscripts.push(id); var scriptNode = document.createElement("script"); scriptNode.type = "text/javascript"; scriptNode.id = id; scriptNode.charset = charset ? charset : (BROWSER.firefox ? document.characterSet : document.charset); try { if(src) { scriptNode.src = src; scriptNode.onloadDone = false; scriptNode.onload = function () { scriptNode.onloadDone = true; JSLOADED[src] = 1; }; scriptNode.onreadystatechange = function () { if((scriptNode.readyState == 'loaded' || scriptNode.readyState == 'complete') && !scriptNode.onloadDone) { scriptNode.onloadDone = true; JSLOADED[src] = 1; } }; } else if(text){ scriptNode.text = text; } document.getElementsByTagName('head')[0].appendChild(scriptNode); } catch(e) {} }
18、原生JavaScript返回按ID檢索的元素對(duì)象
function $(id) { return !id ? null : document.getElementById(id); }
19、原生JavaScript返回瀏覽器版本內(nèi)容
function browserVersion(types) { var other = 1; for(i in types) { var v = types<i> ? types<i> : i; if(USERAGENT.indexOf(v) != -1) { var re = new RegExp(v + '(\\/|\\s)([\\d\\.]+)', 'ig'); var matches = re.exec(USERAGENT); var ver = matches != null ? matches[2] : 0; other = ver !== 0 && v != 'mozilla' ? 0 : other; }else { var ver = 0; } eval('BROWSER.' + i + '= ver'); } BROWSER.other = other; }
20、原生JavaScript元素顯示的通用方法
function $(id) { return !id ? null : document.getElementById(id); } function display(id) { var obj = $(id); if(obj.style.visibility) { obj.style.visibility = obj.style.visibility == 'visible' ? 'hidden' : 'visible'; } else { obj.style.display = obj.style.display == '' ? 'none' : ''; } }
21、原生JavaScript中有insertBefore方法,可惜卻沒有insertAfter方法?用如下函數(shù)實(shí)現(xiàn)
function insertAfter(newChild,refChild){ var parElem=refChild.parentNode; if(parElem.lastChild==refChild){ refChild.appendChild(newChild); }else{ parElem.insertBefore(newChild,refChild.nextSibling); } }
22、原生JavaScript中兼容瀏覽器綁定元素事件
function addEventSamp(obj,evt,fn){ if (obj.addEventListener) { obj.addEventListener(evt, fn, false); }else if(obj.attachEvent){ obj.attachEvent('on'+evt,fn); } }
23、原生JavaScript光標(biāo)停在文字的后面,文本框獲得焦點(diǎn)時(shí)調(diào)用
function focusLast(){ var e = event.srcElement; var r =e.createTextRange(); r.moveStart('character',e.value.length); r.collapse(true); r.select(); }
24、原生JavaScript檢驗(yàn)URL鏈接是否有效
function getUrlState(URL){ var xmlhttp = new ActiveXObject("microsoft.xmlhttp"); xmlhttp.Open("GET",URL, false); try{ xmlhttp.Send(); }catch(e){ }finally{ var result = xmlhttp.responseText; if(result){ if(xmlhttp.Status==200){ return(true); }else{ return(false); } }else{ return(false); } } }
25、原生JavaScript格式化CSS樣式代碼
function formatCss(s){//格式化代碼 s = s.replace(/\s*([\{\}\:\;\,])\s*/g, "$1"); s = s.replace(/;\s*;/g, ";"); //清除連續(xù)分號(hào) s = s.replace(/\,[\s\.\#\d]*{/g, "{"); s = s.replace(/([^\s])\{([^\s])/g, "$1 {\n\t$2"); s = s.replace(/([^\s])\}([^\n]*)/g, "$1\n}\n$2"); s = s.replace(/([^\s]);([^\s\}])/g, "$1;\n\t$2"); return s; }
26、原生JavaScript壓縮CSS樣式代碼
function yasuoCss (s) {//壓縮代碼 s = s.replace(/\/\*(.|\n)*?\*\//g, ""); //刪除注釋 s = s.replace(/\s*([\{\}\:\;\,])\s*/g, "$1"); s = s.replace(/\,[\s\.\#\d]*\{/g, "{"); //容錯(cuò)處理 s = s.replace(/;\s*;/g, ";"); //清除連續(xù)分號(hào) s = s.match(/^\s*(\S+(\s+\S+)*)\s*$/); //去掉首尾空白 return (s == null) ? "" : s[1]; }
27、原生JavaScript獲取當(dāng)前路徑
var currentPageUrl = ""; if (typeof this.href === "undefined") { currentPageUrl = document.location.toString().toLowerCase(); } else { currentPageUrl = this.href.toString().toLowerCase(); }
28、原生JavaScriptIP轉(zhuǎn)成整型
function _ip2int(ip){ var num = 0; ip = ip.split("."); num = Number(ip[0]) * 256 * 256 * 256 + Number(ip[1]) * 256 * 256 + Number(ip[2]) * 256 + Number(ip[3]); num = num >>> 0; return num; }
29、原生JavaScript整型解析為IP地址
function _int2iP(num){ var str; var tt = new Array(); tt[0] = (num >>> 24) >>> 0; tt[1] = ((num << 8) >>> 24) >>> 0; tt[2] = (num << 16) >>> 24; tt[3] = (num << 24) >>> 24; str = String(tt[0]) + "." + String(tt[1]) + "." + String(tt[2]) + "." + String(tt[3]); return str; }
30、原生JavaScript實(shí)現(xiàn)checkbox全選與全不選
function checkAll() { var selectall = document.getElementById("selectall"); var allbox = document.getElementsByName("allbox"); if (selectall.checked) { for (var i = 0; i < allbox.length; i++) { allbox.checked = true; } } else { for (var i = 0; i < allbox.length; i++) { allbox.checked = false; } } }
31、原生JavaScript判斷是否移動(dòng)設(shè)備
function isMobile(){ if (typeof this._isMobile === 'boolean'){ return this._isMobile; } var screenWidth = this.getScreenWidth(); var fixViewPortsExperiment = rendererModel.runningExperiments.FixViewport || rendererModel.runningExperiments.fixviewport; var fixViewPortsExperimentRunning = fixViewPortsExperiment && (fixViewPortsExperiment.toLowerCase() === "new"); if(!fixViewPortsExperiment){ if(!this.isAppleMobileDevice()){ screenWidth = screenWidth/window.devicePixelRatio; } } var isMobileScreenSize = screenWidth < 600; var isMobileUserAgent = false; this._isMobile = isMobileScreenSize && this.isTouchScreen(); return this._isMobile; }
32、原生JavaScript判斷是否移動(dòng)設(shè)備訪問
function isAppleMobileDevice(){ return (/iphone|ipod|ipad|Macintosh/i.test(navigator.userAgent.toLowerCase())); }
33、原生JavaScript判斷是否蘋果移動(dòng)設(shè)備訪問
function isAppleMobileDevice(){ return (/iphone|ipod|ipad|Macintosh/i.test(navigator.userAgent.toLowerCase())); }
34、原生JavaScript判斷是否安卓移動(dòng)設(shè)備訪問
function isAndroidMobileDevice(){ return (/android/i.test(navigator.userAgent.toLowerCase())); }
35、原生JavaScript判斷是否Touch屏幕
function isTouchScreen(){ return (('ontouchstart' in window) || window.DocumentTouch && document instanceof DocumentTouch); }
36、原生JavaScript判斷是否在安卓上的谷歌瀏覽器
function isNewChromeOnAndroid(){ if(this.isAndroidMobileDevice()){ var userAgent = navigator.userAgent.toLowerCase(); if((/chrome/i.test(userAgent))){ var parts = userAgent.split('chrome/'); var fullVersionString = parts[1].split(" ")[0]; var versionString = fullVersionString.split('.')[0]; var version = parseInt(versionString); if(version >= 27){ return true; } } } return false; }
37、原生JavaScript判斷是否打開視窗
function isViewportOpen() { return !!document.getElementById('wixMobileViewport'); }
38、原生JavaScript獲取移動(dòng)設(shè)備初始化大小
function getInitZoom(){ if(!this._initZoom){ var screenWidth = Math.min(screen.height, screen.width); if(this.isAndroidMobileDevice() && !this.isNewChromeOnAndroid()){ screenWidth = screenWidth/window.devicePixelRatio; } this._initZoom = screenWidth /document.body.offsetWidth; } return this._initZoom; }
39、原生JavaScript獲取移動(dòng)設(shè)備最大化大小
function getZoom(){ var screenWidth = (Math.abs(window.orientation) === 90) ? Math.max(screen.height, screen.width) : Math.min(screen.height, screen.width); if(this.isAndroidMobileDevice() && !this.isNewChromeOnAndroid()){ screenWidth = screenWidth/window.devicePixelRatio; } var FixViewPortsExperiment = rendererModel.runningExperiments.FixViewport || rendererModel.runningExperiments.fixviewport; var FixViewPortsExperimentRunning = FixViewPortsExperiment && (FixViewPortsExperiment === "New" || FixViewPortsExperiment === "new"); if(FixViewPortsExperimentRunning){ return screenWidth / window.innerWidth; }else{ return screenWidth / document.body.offsetWidth; } }
40、原生JavaScript獲取移動(dòng)設(shè)備屏幕寬度
function getScreenWidth(){ var smallerSide = Math.min(screen.width, screen.height); var fixViewPortsExperiment = rendererModel.runningExperiments.FixViewport || rendererModel.runningExperiments.fixviewport; var fixViewPortsExperimentRunning = fixViewPortsExperiment && (fixViewPortsExperiment.toLowerCase() === "new"); if(fixViewPortsExperiment){ if(this.isAndroidMobileDevice() && !this.isNewChromeOnAndroid()){ smallerSide = smallerSide/window.devicePixelRatio; } } return smallerSide; }
41、原生 JavaScript完美判斷是否為網(wǎng)址
function IsURL(strUrl) { var regular = /^\b(((https?|ftp):\/\/)?[-a-z0-9]+(\.[-a-z0-9]+)*\.(?:com|edu|gov|int|mil|net|org|biz|info|name|museum|asia|coop|aero|[a-z][a-z]|((25[0-5])|(2[0-4]\d)|(1\d\d)|([1-9]\d)|\d))\b(\/[-a-z0-9_:\@&?=+,.!\/~%\$]*)?)$/i if (regular.test(strUrl)) { return true; } else { return false; } }
42、原生JavaScript根據(jù)樣式名稱檢索元素對(duì)象
function getElementsByClassName(name) { var tags = document.getElementsByTagName('*') || document.all; var els = []; for (var i = 0; i < tags.length; i++) { if (tags.className) { var cs = tags.className.split(' '); for (var j = 0; j < cs.length; j++) { if (name == cs[j]) { els.push(tags); break } } } } return els }
43、原生JavaScript判斷是否以某個(gè)字符串開頭
String.prototype.startWith = function (s) { return this.indexOf(s) == 0 }
44、原生JavaScript判斷是否以某個(gè)字符串結(jié)束
String.prototype.endWith = function (s) { var d = this.length - s.length; return (d >= 0 && this.lastIndexOf(s) == d) }
45、原生JavaScript返回IE瀏覽器的版本號(hào)
function getIE(){ if (window.ActiveXObject){ var v = navigator.userAgent.match(/MSIE ([^;]+)/)[1]; return parseFloat(v.substring(0, v.indexOf("."))) } return false }
46、原生JavaScript獲取頁面高度
function getPageHeight(){ var g = document, a = g.body, f = g.documentElement, d = g.compatMode == "BackCompat" ? a : g.documentElement; return Math.max(f.scrollHeight, a.scrollHeight, d.clientHeight); }
47、原生JavaScript獲取頁面scrollLeft
function getPageScrollLeft(){ var a = document; return a.documentElement.scrollLeft || a.body.scrollLeft; }
48、原生JavaScript獲取頁面可視寬度
function getPageViewWidth(){ var d = document, a = d.compatMode == "BackCompat" ? d.body : d.documentElement; return a.clientWidth; }
49、原生JavaScript獲取頁面寬度
function getPageWidth(){ var g = document, a = g.body, f = g.documentElement, d = g.compatMode == "BackCompat" ? a : g.documentElement; return Math.max(f.scrollWidth, a.scrollWidth, d.clientWidth); }
50、原生JavaScript獲取頁面scrollTop
function getPageScrollTop(){ var a = document; return a.documentElement.scrollTop || a.body.scrollTop; }
到此,關(guān)于“原生JavaScript技巧有哪些”的學(xué)習(xí)就結(jié)束了,希望能夠解決大家的疑惑。理論與實(shí)踐的搭配能更好的幫助大家學(xué)習(xí),快去試試吧!若想繼續(xù)學(xué)習(xí)更多相關(guān)知識(shí),請(qǐng)繼續(xù)關(guān)注億速云網(wǎng)站,小編會(huì)繼續(xù)努力為大家?guī)砀鄬?shí)用的文章!
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