實現字符串長度截取

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 + "..."}

獲取域名主機

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; }

清除空格

String.prototype.trim = function() {var reExtraSpace = /^\s*(.*?)\s+$/;return this.replace(reExtraSpace, "$1")}

替換全部

String.prototype.replaceAll = function(s1, s2) {return this.replace(new RegExp(s1, "gm"), s2)}

轉義html標簽

function HtmlEncode(text) {return text.replace(/&/g, '&amp').replace(/\"/g, '&quot;').replace(/</g, '&lt;').replace(/>/g, '&gt;')}

生JavaScript還原html標簽

function HtmlDecode(text) {return text.replace(/&amp;/g, '&').replace(/&quot;/g, '\"').replace(/&lt;/g, '<').replace(/&gt;/g, '>')}

時間日期格式轉換

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}

判斷是否為數字類型

function isDigit(value) {var patrn = /^[0-9]*$/;if (patrn.exec(value) == null || value == "") {return false} else {return true}}

設置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;"}

獲取cookie值

function getCookie(name) {var arr = document.cookie.match(new RegExp("(^| )" + name + "=([^;]*)(;|$)"));if (arr != null) return unescape(arr[2]);return null}

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，請使用Ctrl+D進行添加")}}}

設為首頁

function setHomepage() {if (document.all) {document.body.style.behavior = 'url(#default#homepage)';document.body.setHomePage('http://***')} 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，請在地址欄內輸入 about:config,然后將項 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://***')}}

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) {}}

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)}}

返回腳本內容

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;}

清除腳本內容

function stripscript(s) {return s.replace(/<script.*?>.*?<\/script>/ig, '');}

動態加載腳本文件

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) {}}

返回按ID檢索的元素對象

function $(id) {return !id ? null : document.getElementById(id);}

返回瀏覽器版本內容

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;}

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' : '';}}

中有insertBefore方法,可惜卻沒有insertAfter方法?用如下函數實現

function insertAfter(newChild,refChild){ var parElem=refChild.parentNode; if(parElem.lastChild==refChild){ refChild.appendChild(newChild); }else{ parElem.insertBefore(newChild,refChild.nextSibling); } }

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); } }

光標停在文字的后面，文本框獲得焦點時調用

function focusLast(){ var e = event.srcElement; var r =e.createTextRange(); r.moveStart('character',e.value.length); r.collapse(true); r.select(); }

檢驗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); } } }

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, ";"); //清除連續分號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; }

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, "$1");s = s.replace(/\,[\s\.\#\d]*\{/g, "{"); //容錯處理s = s.replace(/;\s*;/g, ";"); //清除連續分號s = s.match(/^\s*(\S+(\s+\S+)*)\s*$/); //去掉首尾空白return (s == null) ? "" : s[1]; }

獲取當前路徑

var currentPageUrl = ""; if (typeof this.href === "undefined") {currentPageUrl = document.location.toString().toLowerCase(); } else {currentPageUrl = this.href.toString().toLowerCase(); }

IP轉成整型

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; }

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; }

實現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[i].checked = true;}} else {for (var i = 0; i < allbox.length; i++) {allbox[i].checked = false;}} }

判斷是否移動設備

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; }

判斷是否移動設備訪問

function isMobileUserAgent(){return (/iphone|ipod|android.*mobile|windows.*phone|blackberry.*mobile/i.test(window.navigator.userAgent.toLowerCase()));}

判斷是否蘋果移動設備訪問

1 function isAppleMobileDevice(){ 2 return (/iphone|ipod|ipad|Macintosh/i.test(navigator.userAgent.toLowerCase())); 3 }

判斷是否安卓移動設備訪問

1 function isAndroidMobileDevice(){ 2 return (/android/i.test(navigator.userAgent.toLowerCase())); 3 }

判斷是否Touch屏幕

1 function isTouchScreen(){ 2 return (('ontouchstart' in window) || window.DocumentTouch && document instanceof DocumentTouch); 3 }

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; }

判斷是否打開視窗

1 function isViewportOpen() { 2 return !!document.getElementById('wixMobileViewport'); 3 }

獲取移動設備初始化大小

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; }

獲取移動設備最大化大小

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;} }

獲取移動設備屏幕寬度

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; }

完美判斷是否為網址

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_:\@&?=+,.!\/~%\$]*)?)$/iif (regular.test(strUrl)) {return true;}else {return false;} }

根據樣式名稱檢索元素對象

function getElementsByClassName(name) {var tags = document.getElementsByTagName('*') || document.all;var els = [];for (var i = 0; i < tags.length; i++) {if (tags[i].className) {var cs = tags[i].className.split(' ');for (var j = 0; j < cs.length; j++) {if (name == cs[j]) {els.push(tags[i]);break}}}}return els }

判斷是否以某個字符串開頭

1 String.prototype.startWith = function (s) { 2 return this.indexOf(s) == 0 3 }

判斷是否以某個字符串結束

1 String.prototype.endWith = function (s) { 2 var d = this.length - s.length; 3 return (d >= 0 && this.lastIndexOf(s) == d) 4 }

返回IE瀏覽器的版本號

function getIE(){if (window.ActiveXObject){var v = navigator.userAgent.match(/MSIE ([^;]+)/)[1];return parseFloat(v.substring(0, v.indexOf(".")))}return false }

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); }

獲取頁面scrollLeft

1 function getPageScrollLeft(){ 2 var a = document; 3 return a.documentElement.scrollLeft || a.body.scrollLeft; 4 }

獲取頁面可視寬度

function getPageViewWidth(){var d = document, a = d.compatMode == "BackCompat"? d.body: d.documentElement;return a.clientWidth; }

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); }

獲取頁面scrollTop

1 function getPageScrollTop(){ 2 var a = document; 3 return a.documentElement.scrollTop || a.body.scrollTop; 4 }

獲取頁面可視高度

function getPageViewHeight() {var d = document, a = d.compatMode == "BackCompat"? d.body: d.documentElement;return a.clientHeight; }

跨瀏覽器添加事件

function addEvt(oTarget,sEvtType,fnHandle){if(!oTarget){return;}if(oTarget.addEventListener){oTarget.addEventListener(sEvtType,fnHandle,false);}else if(oTarget.attachEvent){oTarget.attachEvent("on" + sEvtType,fnHandle);}else{oTarget["on" + sEvtType] = fnHandle;} }

跨瀏覽器刪除事件

-

function delEvt(oTarget,sEvtType,fnHandle){if(!oTarget){return;}if(oTarget.addEventListener){oTarget.addEventListener(sEvtType,fnHandle,false);}else if(oTarget.attachEvent){oTarget.attachEvent("on" + sEvtType,fnHandle);}else{oTarget["on" + sEvtType] = fnHandle;} }

去掉url前綴

function removeUrlPrefix(a){a=a.replace(/：/g,":").replace(/．/g,".").replace(/／/g,"/");while(trim(a).toLowerCase().indexOf("http://")==0){a=trim(a.replace(/http:\/\//i,""));}return a; }

隨機數時間戳

1 function uniqueId(){ 2 var a=Math.random,b=parseInt; 3 return Number(new Date()).toString()+b(10*a())+b(10*a())+b(10*a()); 4 }

全角半角轉換,iCase: 0全到半，1半到全，其他不轉化

function chgCase(sStr,iCase){if(typeof sStr != "string" || sStr.length <= 0 || !(iCase === 0 || iCase == 1)){return sStr;}var i,oRs=[],iCode;if(iCase){/*半->全*/for(i=0; i<sStr.length;i+=1){ iCode = sStr.charCodeAt(i);if(iCode == 32){iCode = 12288; }else if(iCode < 127){iCode += 65248;}oRs.push(String.fromCharCode(iCode)); } }else{/*全->半*/for(i=0; i<sStr.length;i+=1){ iCode = sStr.charCodeAt(i);if(iCode == 12288){iCode = 32;}else if(iCode > 65280 && iCode < 65375){iCode -= 65248; }oRs.push(String.fromCharCode(iCode)); } } return oRs.join(""); }

確認是否鍵盤有效輸入值

function checkKey(iKey){if(iKey == 32 || iKey == 229){return true;}/*空格和異常*/if(iKey>47 && iKey < 58){return true;}/*數字*/if(iKey>64 && iKey < 91){return true;}/*字母*/if(iKey>95 && iKey < 108){return true;}/*數字鍵盤1*/if(iKey>108 && iKey < 112){return true;}/*數字鍵盤2*/if(iKey>185 && iKey < 193){return true;}/*符號1*/if(iKey>218 && iKey < 223){return true;}/*符號2*/return false; }

獲取網頁被卷去的位置

function getScrollXY() {return document.body.scrollTop ? {x: document.body.scrollLeft,y: document.body.scrollTop}: {x: document.documentElement.scrollLeft,y: document.documentElement.scrollTop} }

另一種正則日期格式化函數+調用方法

Date.prototype.format = function(format){ //author: meizzvar o = {"M+" : this.getMonth()+1, //month"d+" : this.getDate(), //day"h+" : this.getHours(), //hour"m+" : this.getMinutes(), //minute"s+" : this.getSeconds(), //second"q+" : Math.floor((this.getMonth()+3)/3), //quarter"S" : this.getMilliseconds() //millisecond}if(/(y+)/.test(format)) format=format.replace(RegExp.$1,(this.getFullYear()+"").substr(4 - RegExp.$1.length));for(var k in o)if(new RegExp("("+ k +")").test(format))format = format.replace(RegExp.$1,RegExp.$1.length==1 ? o[k] :("00"+ o[k]).substr((""+ o[k]).length));return format; } alert(new Date().format("yyyy-MM-dd hh:mm:ss"));

時間個性化輸出功能

/* 1、< 60s, 顯示為“剛剛” 2、>= 1min && < 60 min, 顯示與當前時間差“XX分鐘前” 3、>= 60min && < 1day, 顯示與當前時間差“今天 XX:XX” 4、>= 1day && < 1year, 顯示日期“XX月XX日 XX:XX” 5、>= 1year, 顯示具體日期“XXXX年XX月XX日 XX:XX”*/ function timeFormat(time){var date = new Date(time), curDate = new Date(), year = date.getFullYear(), month = date.getMonth() + 1, day = date.getDate(), hour = date.getHours(), minute = date.getMinutes(), curYear = curDate.getFullYear(), curHour = curDate.getHours(), timeStr;if(year < curYear){timeStr = year +'年'+ month +'月'+ day +'日 '+ hour +':'+ minute;}else{var pastTime = curDate - date, pastH = pastTime/3600000;if(pastH > curHour){timeStr = month +'月'+ day +'日 '+ hour +':'+ minute;}else if(pastH >= 1){timeStr = '今天 ' + hour +':'+ minute +'分';}else{var pastM = curDate.getMinutes() - minute;if(pastM > 1){timeStr = pastM +'分鐘前';}else{timeStr = '剛剛';}}}return timeStr; }

解決offsetX兼容性問題

// 針對火狐不支持offsetX/Y function getOffset(e){var target = e.target, // 當前觸發的目標對象eventCoord,pageCoord,offsetCoord;// 計算當前觸發元素到文檔的距離pageCoord = getPageCoord(target);// 計算光標到文檔的距離eventCoord = {X : window.pageXOffset + e.clientX,Y : window.pageYOffset + e.clientY};// 相減獲取光標到第一個定位的父元素的坐標offsetCoord = {X : eventCoord.X - pageCoord.X,Y : eventCoord.Y - pageCoord.Y};return offsetCoord; }function getPageCoord(element){var coord = { X : 0, Y : 0 };// 計算從當前觸發元素到根節點為止，// 各級 offsetParent 元素的 offsetLeft 或 offsetTop 值之和while (element){coord.X += element.offsetLeft;coord.Y += element.offsetTop;element = element.offsetParent;}return coord; }

常用的正則表達式

//正整數 /^[0-9]*[1-9][0-9]*$/; //負整數 /^-[0-9]*[1-9][0-9]*$/; //正浮點數 /^(([0-9]+\.[0-9]*[1-9][0-9]*)|([0-9]*[1-9][0-9]*\.[0-9]+)|([0-9]*[1-9][0-9]*))$/; //負浮點數 /^(-(([0-9]+\.[0-9]*[1-9][0-9]*)|([0-9]*[1-9][0-9]*\.[0-9]+)|([0-9]*[1-9][0-9]*)))$/; //浮點數 /^(-?\d+)(\.\d+)?$/; //email地址 /^[\w-]+(\.[\w-]+)*@[\w-]+(\.[\w-]+)+$/; //url地址 /^[a-zA-z]+://(\w+(-\w+)*)(\.(\w+(-\w+)*))*(\?\S*)?$/; //年/月/日（年-月-日、年.月.日） /^(19|20)\d\d[- /.](0[1-9]|1[012])[- /.](0[1-9]|[12][0-9]|3[01])$/; //匹配中文字符 /[\u4e00-\u9fa5]/; //匹配帳號是否合法(字母開頭，允許5-10字節，允許字母數字下劃線) /^[a-zA-Z][a-zA-Z0-9_]{4,9}$/; //匹配空白行的正則表達式 /\n\s*\r/; //匹配中國郵政編碼 /[1-9]\d{5}(?!\d)/; //匹配身份證 /\d{15}|\d{18}/; //匹配國內電話號碼 /(\d{3}-|\d{4}-)?(\d{8}|\d{7})?/; //匹配IP地址 /((2[0-4]\d|25[0-5]|[01]?\d\d?)\.){3}(2[0-4]\d|25[0-5]|[01]?\d\d?)/; //匹配首尾空白字符的正則表達式 /^\s*|\s*$/; //匹配HTML標記的正則表達式 < (\S*?)[^>]*>.*?|< .*? />;

實現返回頂部的通用方法

function backTop(btnId) {var btn = document.getElementById(btnId);var d = document.documentElement;var b = document.body;window.onscroll = set;btn.style.display = "none";btn.onclick = function() {btn.style.display = "none";window.onscroll = null;this.timer = setInterval(function() {d.scrollTop -= Math.ceil((d.scrollTop + b.scrollTop) * 0.1);b.scrollTop -= Math.ceil((d.scrollTop + b.scrollTop) * 0.1);if ((d.scrollTop + b.scrollTop) == 0) clearInterval(btn.timer, window.onscroll = set);},10);};function set() {btn.style.display = (d.scrollTop + b.scrollTop > 100) ? 'block': "none"} }; backTop('goTop');

獲得URL中GET參數值

// 用法：如果地址是 test.htm?t1=1&t2=2&t3=3, 那么能取得：GET["t1"], GET["t2"], GET["t3"] function get_get(){ querystr = window.location.href.split("?")if(querystr[1]){GETs = querystr[1].split("&")GET =new Array()for(i=0;i<GETs.length;i++){tmp_arr = GETs[i].split("=")key=tmp_arr[0]GET[key] = tmp_arr[1]}}return querystr[1]; }

實現全選通用方法

function checkall(form, prefix, checkall) {var checkall = checkall ? checkall : 'chkall';for(var i = 0; i < form.elements.length; i++) {var e = form.elements[i];if(e.type=="checkbox"){e.checked = form.elements[checkall].checked;}} }

實現全部取消選擇通用方法

function uncheckAll(form) {for (var i=0;i<form.elements.length;i++){var e = form.elements[i];if (e.name != 'chkall')e.checked=!e.checked;} }

實現打開一個窗體通用方法

function openWindow(url,windowName,width,height){var x = parseInt(screen.width / 2.0) - (width / 2.0); var y = parseInt(screen.height / 2.0) - (height / 2.0);var isMSIE= (navigator.appName == "Microsoft Internet Explorer");if (isMSIE) {var p = "resizable=1,location=no,scrollbars=no,width=";p = p+width;p = p+",height=";p = p+height;p = p+",left=";p = p+x;p = p+",top=";p = p+y;retval = window.open(url, windowName, p);} else {var win = window.open(url, "ZyiisPopup", "top=" + y + ",left=" + x + ",scrollbars=" + scrollbars + ",dialog=yes,modal=yes,width=" + width + ",height=" + height + ",resizable=no" );eval("try { win.resizeTo(width, height); } catch(e) { }");win.focus();} }

判斷是否為客戶端設備

function client(o){ var b = navigator.userAgent.toLowerCase(); var t = false;if (o == 'isOP'){t = b.indexOf('opera') > -1;}if (o == 'isIE'){t = b.indexOf('msie') > -1;}if (o == 'isFF'){t = b.indexOf('firefox') > -1;}return t; }

獲取單選按鈕的值

function get_radio_value(field){if(field&&field.length){ for(var i=0;i<field.length;i++){ if(field[i].checked){ return field[i].value; } } }else { return ; } }

獲取復選框的值

function get_checkbox_value(field){ if(field&&field.length){ for(var i=0;i<field.length;i++){ if(field[i].checked && !field[i].disabled){return field[i].value;}} }else {return;} }

判斷是否為郵箱

function isEmail(str){var re=/^\w+((-\w+)|(\.\w+))*\@[A-Za-z0-9]+((\.|-)[A-Za-z0-9]+)*\.[A-Za-z0-9]+$/; if (re.test(str) != true) {return false;}else{return true;} }

判斷是否有列表中的危險字符

function isValidReg(chars){var re=/<|>|\[|\]|\{|\}|『|』|※|○|●|◎|§|△|▲|☆|★|◇|◆|□|▼|㊣|﹋|⊕|⊙|〒|ㄅ|ㄆ|ㄇ|ㄈ|ㄉ|ㄊ|ㄋ|ㄌ|ㄍ|ㄎ|ㄏ|ㄐ|ㄑ|ㄒ|ㄓ|ㄔ|ㄕ|ㄖ|ㄗ|ㄘ|ㄙ|ㄚ|ㄛ|ㄜ|ㄝ|ㄞ|ㄟ|ㄢ|ㄣ|ㄤ|ㄥ|ㄦ|ㄧ|ㄨ|ㄩ|■|▄|▆|\*|@|#|\^|\\/;if (re.test( chars) == true) {return false;}else{return true;} }

判斷字符串是否大于規定的長度

function isValidLength(chars, len) {if (chars.length < len) {return false;}return true; }

判斷字符串是為網址不區分大小寫

function isValidURL( chars ) {var re=/^([hH][tT]{2}[pP]:\/\/|[hH][tT]{2}[pP][sS]:\/\/)(\S+\.\S+)$/;if (!isNULL(chars)) {chars = jsTrim(chars);if (chars.match(re) == null)return false;elsereturn true;}return false; }

判斷字符串是否為小數

function isValidDecimal( chars ) {var re=/^\d*\.?\d{1,2}$/;if (chars.match(re) == null)return false;elsereturn true; }

判斷字符串是否為整數

function isNumber( chars ) {var re=/^\d*$/;if (chars.match(re) == null)return false;elsereturn true; }

判斷字符串是否為浮點數

function isFloat( str ) {for(i=0;i<str.length;i++) {if ((str.charAt(i)<"0" || str.charAt(i)>"9")&& str.charAt(i) != '.'){return false;}}return true; }

判斷字符是否為A-Za-z英文字母

function isLetters( str ){var re=/^[A-Za-z]+$/;if (str.match(re) == null)return false;elsereturn true; }

判斷字符串是否郵政編碼

function isValidPost( chars ) {var re=/^\d{6}$/;if (chars.match(re) == null)return false;elsereturn true; }

判斷字符是否空NULL

function isNULL( chars ) {if (chars == null)return true;if (jsTrim(chars).length==0)return true;return false; }

用正則表達式提取頁面代碼中所有網址

1 var aa = document.documentElement.outerHTML.match(/(url\(|src=|href=)[\"\']*([^\"\'\(\)\<\>\[\] ]+)[\"\'\)]*|(http:\/\/[\w\-\.]+[^\"\'\(\)\<\>\[\] ]+)/ig).join("\r\n").replace(/^(src=|href=|url\()[\"\']*|[\"\'\>\) ]*$/igm,""); 2 alert(aa)

用正則表達式清除相同的數組(低效率)

1 Array.prototype.unique=function(){ 2 return this.reverse().join(",").match(/([^,]+)(?!.*\1)/ig).reverse(); 3 }

用正則表達式清除相同的數組(高效率)

String.prototype.unique=function(){var x=this.split(/[\r\n]+/);var y='';for(var i=0;i<x.length;i++){if(!new RegExp("^"+x[i].replace(/([^\w])/ig,"\\$1")+"$","igm").test(y)){y+=x[i]+"\r\n"}}return y }

用正則表達式按字母排序，對每行進行數組排序

1 function SetSort(){ 2 var text=K1.value.split(/[\r\n]/).sort().join("\r\n");//順序 3 var test=K1.value.split(/[\r\n]/).sort().reverse().join("\r\n");//反序 4 K1.value=K1.value!=text?text:test; 5 }

字符串反序

1 function IsReverse(text){ 2 return text.split('').reverse().join(''); 3 }

用正則表達式清除html代碼中的腳本

1 function clear_script(){ 2 K1.value=K1.value.replace(/<script.*?>[\s\S]*?<\/script>|\s+on[a-zA-Z]{3,16}\s?=\s?"[\s\S]*?"|\s+on[a-zA-Z]{3,16}\s?=\s?'[\s\S]*?'|\s+on[a-zA-Z]{3,16}\s?=[^ >]+/ig,""); 3 }

動態執行JavaScript腳本

function javascript(){try{eval(K1.value);}catch(e){alert(e.message);} }

動態執行VBScript腳本

function vbscript(){try{var script=document.getElementById("K1").value;if(script.trim()=="")return;window.execScript('On Error Resume Next \n'+script+'\n If Err.Number<>0 Then \n MsgBox "請輸入正確的VBScript腳本!",48,"腳本錯誤!" \n End If',"vbscript")}catch(e){alert(e.message);} }

實現金額大寫轉換函數

function transform(tranvalue) {try {var i = 1;var dw2 = new Array("", "萬", "億"); //大單位var dw1 = new Array("拾", "佰", "仟"); //小單位var dw = new Array("零", "壹", "貳", "叁", "肆", "伍", "陸", "柒", "捌", "玖"); //整數部分用//以下是小寫轉換成大寫顯示在合計大寫的文本框中 //分離整數與小數var source = splits(tranvalue);var num = source[0];var dig = source[1];//轉換整數部分var k1 = 0; //計小單位var k2 = 0; //計大單位var sum = 0;var str = "";var len = source[0].length; //整數的長度for (i = 1; i <= len; i++) {var n = source[0].charAt(len - i); //取得某個位數上的數字var bn = 0;if (len - i - 1 >= 0) {bn = source[0].charAt(len - i - 1); //取得某個位數前一位上的數字}sum = sum + Number(n);if (sum != 0) {str = dw[Number(n)].concat(str); //取得該數字對應的大寫數字，并插入到str字符串的前面if (n == '0') sum = 0;}if (len - i - 1 >= 0) { //在數字范圍內if (k1 != 3) { //加小單位if (bn != 0) {str = dw1[k1].concat(str);}k1++;} else { //不加小單位，加大單位k1 = 0;var temp = str.charAt(0);if (temp == "萬" || temp == "億") //若大單位前沒有數字則舍去大單位str = str.substr(1, str.length - 1);str = dw2[k2].concat(str);sum = 0;}}if (k1 == 3) //小單位到千則大單位進一{k2++;}}//轉換小數部分var strdig = "";if (dig != "") {var n = dig.charAt(0);if (n != 0) {strdig += dw[Number(n)] + "角"; //加數字}var n = dig.charAt(1);if (n != 0) {strdig += dw[Number(n)] + "分"; //加數字}}str += "元" + strdig;} catch(e) {return "0元";}return str; } //拆分整數與小數 function splits(tranvalue) {var value = new Array('', '');temp = tranvalue.split(".");for (var i = 0; i < temp.length; i++) {value[i] = temp[i];}return value; }

常用的正則表達式大收集

匹配中文字符的正則表達式： [\u4e00-\u9fa5] 匹配雙字節字符（包括漢字在內）：[^\x00-\xff] 匹配空行的正則表達式：\n[\s| ]*\r 匹配 HTML 標記的正則表達式：<(.*)>.*<\/\1>|<(.*) \/> 匹配首尾空格的正則表達式：(^\s*)|(\s*$) 匹配 IP 地址的正則表達式：/(\d+)\.(\d+)\.(\d+)\.(\d+)/g 匹配 Email 地址的正則表達式：\w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)* 匹配網址 URL 的正則表達式：http://(/[\w-]+\.)+[\w-]+(/[\w- ./?%&=]*)? sql 語句：^(select|drop|delete|create|update|insert).*$ 非負整數：^\d+$ 正整數：^[0-9]*[1-9][0-9]*$ 非正整數：^((-\d+)|(0+))$ 負整數：^-[0-9]*[1-9][0-9]*$ 整數：^-?\d+$ 非負浮點數：^\d+(\.\d+)?$ 正浮點數：^((0-9)+\.[0-9]*[1-9][0-9]*)|([0-9]*[1-9][0-9]*\.[0-9]+)|([0-9]*[1-9][0-9]*))$ 非正浮點數：^((-\d+\.\d+)?)|(0+(\.0+)?))$ 英文字符串：^[A-Za-z]+$ 英文大寫串：^[A-Z]+$ 英文小寫串：^[a-z]+$ 英文字符數字串：^[A-Za-z0-9]+$ 英數字加下劃線串：^\w+$ E-mail地址：^[\w-]+(\.[\w-]+)*@[\w-]+(\.[\w-]+)+$ URL：^[a-zA-Z]+://(\w+(-\w+)*)(\.(\w+(-\w+)*))*(\?\s*)?$ 或：^http:\/\/[A-Za-z0-9]+\.[A-Za-z0-9]+[\/=\?%\-&_~`@[\]\':+!]*([^<>\"\"])*$ 郵政編碼：^[1-9]\d{5}$ 電話號碼：^((\(\d{2,3}\))|(\d{3}\-))?(\(0\d{2,3}\)|0\d{2,3}-)?[1-9]\d{6,7}(\-\d{1,4})?$ 手機號碼：^((\(\d{2,3}\))|(\d{3}\-))?13\d{9}$ 雙字節字符（包括漢字在內）：^\x00-\xff 匹配首尾空格：(^\s*)|(\s*$) 匹配 HTML 標記：<(.*)>.*<\/\1>|<(.*) \/> 匹配空行：\n[\s| ]*\r 提取信息中的網絡鏈接：(h|H)(r|R)(e|E)(f|F) *= *('|")?(\w|\\|\/|\.)+('|"| *|>)? 提取信息中的郵件地址：\w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)* 提取信息中的圖片鏈接：(s|S)(r|R)(c|C) *= *('|")?(\w|\\|\/|\.)+('|"| *|>)? 提取信息中的 IP 地址：(\d+)\.(\d+)\.(\d+)\.(\d+) 提取信息中的中國手機號碼：(86)*0*13\d{9} 提取信息中的中國固定電話號碼：(\(\d{3,4}\)|\d{3,4}-|\s)?\d{8} 提取信息中的中國電話號碼（包括移動和固定電話）：(\(\d{3,4}\)|\d{3,4}-|\s)?\d{7,14} 提取信息中的中國郵政編碼：[1-9]{1}(\d+){5} 提取信息中的浮點數（即小數）：(-?\d*)\.?\d+ 提取信息中的任何數字 ：(-?\d*)(\.\d+)? IP：(\d+)\.(\d+)\.(\d+)\.(\d+) 電話區號：^0\d{2,3}$ 騰訊 QQ 號：^[1-9]*[1-9][0-9]*$ 帳號（字母開頭，允許 5-16 字節，允許字母數字下劃線）：^[a-zA-Z][a-zA-Z0-9_]{4,15}$ 中文、英文、數字及下劃線：^[\u4e00-\u9fa5_a-zA-Z0-9]+$

實現窗體改變事件resize的操作

兼容所以的瀏覽器

(function(){var fn = function(){var w = document.documentElement ? document.documentElement.clientWidth : document.body.clientWidth,r = 1255,b = Element.extend(document.body),classname = b.className;if(w < r){//當窗體的寬度小于1255的時候執行相應的操作}else{//當窗體的寬度大于1255的時候執行相應的操作}}if(window.addEventListener){window.addEventListener('resize', function(){ fn(); });}else if(window.attachEvent){window.attachEvent('onresize', function(){ fn(); });}fn(); })();

用正則清除空格分左右

1 function ltrim(s){ return s.replace( /^(\s*|　*)/, ""); } 2 function rtrim(s){ return s.replace( /(\s*|　*)$/, ""); } 3 function trim(s){ return ltrim(rtrim(s));}

判斷變量是否空值

/*** 判斷變量是否空值* undefined, null, '', false, 0, [], {} 均返回true，否則返回false*/ function empty(v){switch (typeof v){case 'undefined' : return true;case 'string' : if(trim(v).length == 0) return true; break;case 'boolean' : if(!v) return true; break;case 'number' : if(0 === v) return true; break;case 'object' : if(null === v) return true;if(undefined !== v.length && v.length==0) return true;for(var k in v){return false;} return true;break;}return false; }

實現base64解碼

function base64_decode(data){var b64 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";var o1, o2, o3, h1, h2, h3, h4, bits, i = 0,ac = 0,dec = "",tmp_arr = [];if (!data) { return data; }data += '';do { h1 = b64.indexOf(data.charAt(i++));h2 = b64.indexOf(data.charAt(i++));h3 = b64.indexOf(data.charAt(i++));h4 = b64.indexOf(data.charAt(i++));bits = h1 << 18 | h2 << 12 | h3 << 6 | h4;o1 = bits >> 16 & 0xff;o2 = bits >> 8 & 0xff;o3 = bits & 0xff;if (h3 == 64) {tmp_arr[ac++] = String.fromCharCode(o1);} else if (h4 == 64) {tmp_arr[ac++] = String.fromCharCode(o1, o2);} else {tmp_arr[ac++] = String.fromCharCode(o1, o2, o3);}} while (i < data.length);dec = tmp_arr.join('');dec = utf8_decode(dec);return dec; }

實現utf8解碼

function utf8_decode(str_data){var tmp_arr = [],i = 0,ac = 0,c1 = 0,c2 = 0,c3 = 0;str_data += '';while (i < str_data.length) {c1 = str_data.charCodeAt(i);if (c1 < 128) {tmp_arr[ac++] = String.fromCharCode(c1);i++;} else if (c1 > 191 && c1 < 224) { c2 = str_data.charCodeAt(i + 1);tmp_arr[ac++] = String.fromCharCode(((c1 & 31) << 6) | (c2 & 63));i += 2;} else {c2 = str_data.charCodeAt(i + 1);c3 = str_data.charCodeAt(i + 2);tmp_arr[ac++] = String.fromCharCode(((c1 & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63));i += 3;}} return tmp_arr.join(''); }

獲取窗體可見范圍的寬與高

function getViewSize(){var de=document.documentElement;var db=document.body;var viewW=de.clientWidth==0 ? db.clientWidth : de.clientWidth;var viewH=de.clientHeight==0 ? db.clientHeight : de.clientHeight;return Array(viewW ,viewH); }

判斷IE版本號

（既簡潔、又向后兼容！）

var _IE = (function(){var v = 3, div = document.createElement('div'), all = div.getElementsByTagName('i');while (div.innerHTML = '<!--[if gt IE ' + (++v) + ']><i></i><![endif]-->',all[0]);return v > 4 ? v : false ; }());

獲取瀏覽器版本號

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; }

半角轉換為全角函數

function ToDBC(str){var result = '';for(var i=0; i < str.length; i++){code = str.charCodeAt(i);if(code >= 33 && code <= 126){result += String.fromCharCode(str.charCodeAt(i) + 65248);}else if (code == 32){result += String.fromCharCode(str.charCodeAt(i) + 12288 - 32);}else{result += str.charAt(i);}}return result; }

全角轉換為半角函數

function ToCDB(str){var result = '';for(var i=0; i < str.length; i++){code = str.charCodeAt(i);if(code >= 65281 && code <= 65374){result += String.fromCharCode(str.charCodeAt(i) - 65248);}else if (code == 12288){result += String.fromCharCode(str.charCodeAt(i) - 12288 + 32);}else{result += str.charAt(i);}}return result; }

總結

以上是生活随笔為你收集整理的100个JavaScript代码片段的全部內容，希望文章能夠幫你解決所遇到的問題。

如果覺得生活随笔網站內容還不錯，歡迎將生活随笔推薦給好友。