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JavaScript实用功能代码片段
1、原生JavaScript实现字符串长度截取 1 function cutstr(str, len) { 2 var temp; 3 var icount = 0; 4 var patrn = /[^\x00-\xff]/; 5 var strre = ""; 6 for (var i = 0; i < str.length; i++) { 7 if (icount < len - 1) { 8 temp = str.substr(i, 1); 9 if (patrn.exec(temp) == null) { 10 icount = icount + 1 11 } else { 12 icount = icount + 2 13 } 14 strre += temp 15 } else { 16 break 17 } 18 } 19 return strre + "..." 20 } 2、原生JavaScript获取域名主机 1 function getHost(url) { 2 var host = "null"; 3 if(typeof url == "undefined"|| null == url) { 4 url = window.location.href; 5 } 6 var regex = /^\w+\:\/\/([^\/]*).*/; 7 var match = url.match(regex); 8 if(typeof match != "undefined" && null != match) { 9 host = match[1]; 10 } 11 return host; 12 } 3、原生JavaScript清除空格 1 String.prototype.trim = function() { 2 var reExtraSpace = /^\s*(.*?)\s+$/; 3 return this.replace(reExtraSpace, "$1") 4 } 4、原生JavaScript替换全部 1 String.prototype.replaceAll = function(s1, s2) { 2 return this.replace(new RegExp(s1, "gm"), s2) 3 } 5、原生JavaScript转义html标签 1 function HtmlEncode(text) { 2 return text.replace(/&/g, ‘&‘).replace(/\"/g, ‘"‘).replace(/</g, ‘<‘).replace(/>/g, ‘>‘) 3 } 6、原生JavaScript还原html标签 1 function HtmlDecode(text) { 2 return text.replace(/&/g, ‘&‘).replace(/"/g, ‘\"‘).replace(/</g, ‘<‘).replace(/>/g, ‘>‘) 3 } 7、原生JavaScript时间日期格式转换 1 Date.prototype.Format = function(formatStr) { 2 var str = formatStr; 3 var Week = [‘日‘, ‘一‘, ‘二‘, ‘三‘, ‘四‘, ‘五‘, ‘六‘]; 4 str = str.replace(/yyyy|YYYY/, this.getFullYear()); 5 str = str.replace(/yy|YY/, (this.getYear() % 100) > 9 ? (this.getYear() % 100).toString() : ‘0‘ + (this.getYear() % 100)); 6 str = str.replace(/MM/, (this.getMonth() + 1) > 9 ? (this.getMonth() + 1).toString() : ‘0‘ + (this.getMonth() + 1)); 7 str = str.replace(/M/g, (this.getMonth() + 1)); 8 str = str.replace(/w|W/g, Week[this.getDay()]); 9 str = str.replace(/dd|DD/, this.getDate() > 9 ? this.getDate().toString() : ‘0‘ + this.getDate()); 10 str = str.replace(/d|D/g, this.getDate()); 11 str = str.replace(/hh|HH/, this.getHours() > 9 ? this.getHours().toString() : ‘0‘ + this.getHours()); 12 str = str.replace(/h|H/g, this.getHours()); 13 str = str.replace(/mm/, this.getMinutes() > 9 ? this.getMinutes().toString() : ‘0‘ + this.getMinutes()); 14 str = str.replace(/m/g, this.getMinutes()); 15 str = str.replace(/ss|SS/, this.getSeconds() > 9 ? this.getSeconds().toString() : ‘0‘ + this.getSeconds()); 16 str = str.replace(/s|S/g, this.getSeconds()); 17 return str 18 } 8、原生JavaScript判断是否为数字类型 1 function isDigit(value) { 2 var patrn = /^[0-9]*$/; 3 if (patrn.exec(value) == null || value =http://www.mamicode.com/="") { 4 return false 5 } else { 6 return true 7 } 8 } 9、原生JavaScript设置cookie值 1 function setCookie(name, value, Hours) { 2 var d = new Date(); 3 var offset = 8; 4 var utc = d.getTime() + (d.getTimezoneOffset() * 60000); 5 var nd = utc + (3600000 * offset); 6 var exp = new Date(nd); 7 exp.setTime(exp.getTime() + Hours * 60 * 60 * 1000); 8 document.cookie = name + "=" + escape(value) + ";path=/;expires=" + exp.toGMTString() + ";domain=360doc.com;" 9 } 10、原生JavaScript获取cookie值 1 function getCookie(name) { 2 var arr = document.cookie.match(new RegExp("(^| )" + name + "=([^;]*)(;|$)")); 3 if (arr != null) return unescape(arr[2]); 4 return null 5 } 11、原生JavaScript加入收藏夹 1 function AddFavorite(sURL, sTitle) { 2 try { 3 window.external.addFavorite(sURL, sTitle) 4 } catch(e) { 5 try { 6 window.sidebar.addPanel(sTitle, sURL, "") 7 } catch(e) { 8 alert("加入收藏失败，请使用Ctrl+D进行添加") 9 } 10 } 11 } 12、原生JavaScript设为首页 1 function setHomepage() { 2 if (document.all) { 3 document.body.style.behavior = ‘url(#default#homepage)‘; 4 document.body.setHomePage(‘http://www.jqueryschool‘) //http:jq-school.com/ 5 } else if (window.sidebar) { 6 if (window.netscape) { 7 try { 8 netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect") 9 } catch(e) { 10 alert("该操作被浏览器拒绝，如果想启用该功能，请在地址栏内输入 about:config,然后将项 signed.applets.codebase_principal_support 值该为true") 11 } 12 } 13 var prefs = Components.classes[‘@mozilla.org/preferences-service;1‘].getService(Components.interfaces.nsIPrefBranch); 14 prefs.setCharPref(‘browser.startup.homepage‘, ‘http://www.jqueryschool‘) //http:jq-school.com/
15 }
16 }
13、原生JavaScript判断IE6 1 var ua = navigator.userAgent.toLowerCase(); 2 var isIE6 = ua.indexOf("msie 6") > -1; 3 if (isIE6) { 4 try { 5 document.execCommand("BackgroundImageCache", false, true) 6 } catch(e) {} 7 } 14、原生JavaScript加载样式文件 1 function LoadStyle(url) { 2 try { 3 document.createStyleSheet(url) 4 } catch(e) { 5 var cssLink = document.createElement(‘link‘); 6 cssLink.rel = ‘stylesheet‘; 7 cssLink.type = ‘text/css‘; 8 cssLink.href =http://www.mamicode.com/ url; 9 var head = document.getElementsByTagName(‘head‘)[0]; 10 head.appendChild(cssLink) 11 } 12 } 15、原生JavaScript返回脚本内容 1 function evalscript(s) { 2 if(s.indexOf(‘<script‘) == -1) return s; 3 var p = /<script[^\>]*?>([^\x00]*?)<\/script>/ig; 4 var arr = []; 5 while(arr = p.exec(s)) { 6 var p1 = /<script[^\>]*?src=http://www.mamicode.com/"([^\>]*?)\"[^\>]*?(reload=\"1\")?(?:charset=\"([\w\-]+?)\")?><\/script>/i; 7 var arr1 = []; 8 arr1 = p1.exec(arr[0]); 9 if(arr1) { 10 appendscript(arr1[1], ‘‘, arr1[2], arr1[3]); 11 } else { 12 p1 = /<script(.*?)>([^\x00]+?)<\/script>/i; 13 arr1 = p1.exec(arr[0]); 14 appendscript(‘‘, arr1[2], arr1[1].indexOf(‘reload=‘) != -1); 15 } 16 } 17 return s; 18 } 16、原生JavaScript清除脚本内容 1 function stripscript(s) { 2 return s.replace(/<script.*?>.*?<\/script>/ig, ‘‘); 3 } 17、原生JavaScript动态加载脚本文件 1 function appendscript(src, text, reload, charset) { 2 var id = hash(src + text); 3 if(!reload && in_array(id, evalscripts)) return; 4 if(reload && $(id)) { 5 $(id).parentNode.removeChild($(id)); 6 } 7 8 evalscripts.push(id); 9 var scriptNode = document.createElement("script"); 10 scriptNode.type = "text/javascript"; 11 scriptNode.id = id; 12 scriptNode.charset = charset ? charset : (BROWSER.firefox ? document.characterSet : document.charset); 13 try { 14 if(src) { 15 scriptNode.src =http://www.mamicode.com/ src; 16 scriptNode.onloadDone = false; 17 scriptNode.onload = function () { 18 scriptNode.onloadDone = true; 19 JSLOADED[src] = 1; 20 }; 21 scriptNode.onreadystatechange = function () { 22 if((scriptNode.readyState == ‘loaded‘ || scriptNode.readyState == ‘complete‘) && !scriptNode.onloadDone) { 23 scriptNode.onloadDone = true; 24 JSLOADED[src] = 1; 25 } 26 }; 27 } else if(text){ 28 scriptNode.text = text; 29 } 30 document.getElementsByTagName(‘head‘)[0].appendChild(scriptNode); 31 } catch(e) {} 32 } 18、原生JavaScript返回按ID检索的元素对象 1 function $(id) { 2 return !id ? null : document.getElementById(id); 3 } 19、原生JavaScript返回浏览器版本内容 1 function browserVersion(types) { 2 var other = 1; 3 for(i in types) { 4 var v = types[i] ? types[i] : i; 5 if(USERAGENT.indexOf(v) != -1) { 6 var re = new RegExp(v + ‘(\\/|\\s)([\\d\\.]+)‘, ‘ig‘); 7 var matches = re.exec(USERAGENT); 8 var ver = matches != null ? matches[2] : 0; 9 other = ver !== 0 && v != ‘mozilla‘ ? 0 : other; 10 }else { 11 var ver = 0; 12 } 13 eval(‘BROWSER.‘ + i + ‘= ver‘); 14 } 15 BROWSER.other = other; 16 } 20、原生JavaScript元素显示的通用方法 1 function $(id) { 2 return !id ? null : document.getElementById(id); 3 } 4 function display(id) { 5 var obj = $(id); 6 if(obj.style.visibility) { 7 obj.style.visibility = obj.style.visibility == ‘visible‘ ? ‘hidden‘ : ‘visible‘; 8 } else { 9 obj.style.display = obj.style.display == ‘‘ ? ‘none‘ : ‘‘; 10 } 11 } 21、原生JavaScript中有insertBefore方法,可惜却没有insertAfter方法?用如下函数实现 1 function insertAfter(newChild,refChild){ 2 var parElem=refChild.parentNode; 3 if(parElem.lastChild==refChild){ 4 refChild.appendChild(newChild); 5 }else{ 6 parElem.insertBefore(newChild,refChild.nextSibling); 7 } 8 } 22、原生JavaScript中兼容浏览器绑定元素事件 1 function addEventSamp(obj,evt,fn){ 2 if (obj.addEventListener) { 3 obj.addEventListener(evt, fn, false); 4 }else if(obj.attachEvent){ 5 obj.attachEvent(‘on‘+evt,fn); 6 } 7 } 23、原生JavaScript光标停在文字的后面，文本框获得焦点时调用 1 function focusLast(){ 2 var e = event.srcElement; 3 var r =e.createTextRange(); 4 r.moveStart(‘character‘,e.value.length); 5 r.collapse(true); 6 r.select(); 7 } 24、原生JavaScript检验URL链接是否有效 1 function getUrlState(URL){ 2 var xmlhttp = new ActiveXObject("microsoft.xmlhttp"); 3 xmlhttp.Open("GET",URL, false); 4 try{ 5 xmlhttp.Send(); 6 }catch(e){ 7 }finally{ 8 var result = xmlhttp.responseText; 9 if(result){ 10 if(xmlhttp.Status==200){ 11 return(true); 12 }else{ 13 return(false); 14 } 15 }else{ 16 return(false); 17 } 18 } 19 } 25、原生JavaScript格式化CSS样式代码 1 function formatCss(s){//格式化代码 2 s = s.replace(/\s*([\{\}\:\;\,])\s*/g, "$1"); 3 s = s.replace(/;\s*;/g, ";"); //清除连续分号 4 s = s.replace(/\,[\s\.\#\d]*{/g, "{"); 5 s = s.replace(/([^\s])\{([^\s])/g, "$1 {\n\t$2"); 6 s = s.replace(/([^\s])\}([^\n]*)/g, "$1\n}\n$2"); 7 s = s.replace(/([^\s]);([^\s\}])/g, "$1;\n\t$2"); 8 return s; 9 } 26、原生JavaScript压缩CSS样式代码 1 function yasuoCss (s) {//压缩代码 2 s = s.replace(/\/\*(.|\n)*?\*\//g, ""); //删除注释 3 s = s.replace(/\s*([\{\}\:\;\,])\s*/g, "$1"); 4 s = s.replace(/\,[\s\.\#\d]*\{/g, "{"); //容错处理 5 s = s.replace(/;\s*;/g, ";"); //清除连续分号 6 s = s.match(/^\s*(\S+(\s+\S+)*)\s*$/); //去掉首尾空白 7 return (s == null) ? "" : s[1]; 8 } 27、原生JavaScript获取当前路径 1 var currentPageUrl = ""; 2 if (typeof this.href =http://www.mamicode.com/=="undefined") { 3 currentPageUrl = document.location.toString().toLowerCase(); 4 } 5 else { 6 currentPageUrl = this.href.toString().toLowerCase(); 7 } 28、原生JavaScriptIP转成整型 1 function _ip2int(ip){ 2 var num = 0; 3 ip = ip.split("."); 4 num = Number(ip[0]) * 256 * 256 * 256 + Number(ip[1]) * 256 * 256 + Number(ip[2]) * 256 + Number(ip[3]); 5 num = num >>> 0; 6 return num; 7 } 29、原生JavaScript整型解析为IP地址 1 function _int2iP(num){ 2 var str; 3 var tt = new Array(); 4 tt[0] = (num >>> 24) >>> 0; 5 tt[1] = ((num << 8) >>> 24) >>> 0; 6 tt[2] = (num << 16) >>> 24; 7 tt[3] = (num << 24) >>> 24; 8 str = String(tt[0]) + "." + String(tt[1]) + "." + String(tt[2]) + "." + String(tt[3]); 9 return str; 10 } 30、原生JavaScript实现checkbox全选与全不选 1 function checkAll() { 2 var selectall = document.getElementById("selectall"); 3 var allbox = document.getElementsByName("allbox"); 4 if (selectall.checked) { 5 for (var i = 0; i < allbox.length; i++) { 6 allbox[i].checked = true; 7 } 8 } else { 9 for (var i = 0; i < allbox.length; i++) { 10 allbox[i].checked = false; 11 } 12 } 13 } 31、原生JavaScript判断是否移动设备 1 function isMobile(){ 2 if (typeof this._isMobile === ‘boolean‘){ 3 return this._isMobile; 4 } 5 var screenWidth = this.getScreenWidth(); 6 var fixViewPortsExperiment = rendererModel.runningExperiments.FixViewport || rendererModel.runningExperiments.fixviewport; 7 var fixViewPortsExperimentRunning = fixViewPortsExperiment && (fixViewPortsExperiment.toLowerCase() === "new"); 8 if(!fixViewPortsExperiment){ 9 if(!this.isAppleMobileDevice()){ 10 screenWidth = screenWidth/window.devicePixelRatio; 11 } 12 } 13 var isMobileScreenSize = screenWidth < 600; 14 var isMobileUserAgent = false; 15 this._isMobile = isMobileScreenSize && this.isTouchScreen(); 16 return this._isMobile; 17 } 32、原生JavaScript判断是否移动设备访问 1 function isMobileUserAgent(){ 2 return (/iphone|ipod|android.*mobile|windows.*phone|blackberry.*mobile/i.test(window.navigator.userAgent.toLowerCase())); 3 } 33、原生JavaScript判断是否苹果移动设备访问 1 function isAppleMobileDevice(){ 2 return (/iphone|ipod|ipad|Macintosh/i.test(navigator.userAgent.toLowerCase())); 3 } 34、原生JavaScript判断是否安卓移动设备访问 1 function isAndroidMobileDevice(){ 2 return (/android/i.test(navigator.userAgent.toLowerCase())); 3 } 35、原生JavaScript判断是否Touch屏幕 1 function isTouchScreen(){ 2 return ((‘ontouchstart‘ in window) || window.DocumentTouch && document instanceof DocumentTouch); 3 } 36、原生JavaScript判断是否在安卓上的谷歌浏览器 1 function isNewChromeOnAndroid(){ 2 if(this.isAndroidMobileDevice()){ 3 var userAgent = navigator.userAgent.toLowerCase(); 4 if((/chrome/i.test(userAgent))){ 5 var parts = userAgent.split(‘chrome/‘); 6 7 var fullVersionString = parts[1].split(" ")[0]; 8 var versionString = fullVersionString.split(‘.‘)[0]; 9 var version = parseInt(versionString); 10 11 if(version >= 27){ 12 return true; 13 } 14 } 15 } 16 return false; 17 } 37、原生JavaScript判断是否打开视窗 1 function isViewportOpen() { 2 return !!document.getElementById(‘wixMobileViewport‘); 3 } 38、原生JavaScript获取移动设备初始化大小 1 function getInitZoom(){ 2 if(!this._initZoom){ 3 var screenWidth = Math.min(screen.height, screen.width); 4 if(this.isAndroidMobileDevice() && !this.isNewChromeOnAndroid()){ 5 screenWidth = screenWidth/window.devicePixelRatio; 6 } 7 this._initZoom = screenWidth /document.body.offsetWidth; 8 } 9 return this._initZoom; 10 } 39、原生JavaScript获取移动设备最大化大小 1 function getZoom(){ 2 var screenWidth = (Math.abs(window.orientation) === 90) ? Math.max(screen.height, screen.width) : Math.min(screen.height, screen.width); 3 if(this.isAndroidMobileDevice() && !this.isNewChromeOnAndroid()){ 4 screenWidth = screenWidth/window.devicePixelRatio; 5 } 6 var FixViewPortsExperiment = rendererModel.runningExperiments.FixViewport || rendererModel.runningExperiments.fixviewport; 7 var FixViewPortsExperimentRunning = FixViewPortsExperiment && (FixViewPortsExperiment === "New" || FixViewPortsExperiment === "new"); 8 if(FixViewPortsExperimentRunning){ 9 return screenWidth / window.innerWidth; 10 }else{ 11 return screenWidth / document.body.offsetWidth; 12 } 13 } 40、原生JavaScript获取移动设备屏幕宽度 1 function getScreenWidth(){ 2 var smallerSide = Math.min(screen.width, screen.height); 3 var fixViewPortsExperiment = rendererModel.runningExperiments.FixViewport || rendererModel.runningExperiments.fixviewport; 4 var fixViewPortsExperimentRunning = fixViewPortsExperiment && (fixViewPortsExperiment.toLowerCase() === "new"); 5 if(fixViewPortsExperiment){ 6 if(this.isAndroidMobileDevice() && !this.isNewChromeOnAndroid()){ 7 smallerSide = smallerSide/window.devicePixelRatio; 8 } 9 } 10 return smallerSide; 11 } 41、原生JavaScript完美判断是否为网址 1 function IsURL(strUrl) { 2 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 3 if (regular.test(strUrl)) { 4 return true; 5 } 6 else { 7 return false; 8 } 9 } 42、原生JavaScript根据样式名称检索元素对象 1 function getElementsByClassName(name) { 2 var tags = document.getElementsByTagName(‘*‘) || document.all; 3 var els = []; 4 for (var i = 0; i < tags.length; i++) { 5 if (tags[i].className) { 6 var cs = tags[i].className.split(‘ ‘); 7 for (var j = 0; j < cs.length; j++) { 8 if (name == cs[j]) { 9 els.push(tags[i]); 10 break 11 } 12 } 13 } 14 } 15 return els 16 } 43、原生JavaScript判断是否以某个字符串开头 1 String.prototype.startWith = function (s) { 2 return this.indexOf(s) == 0 3 } 44、原生JavaScript判断是否以某个字符串结束 1 String.prototype.endWith = function (s) { 2 var d = this.length - s.length; 3 return (d >= 0 && this.lastIndexOf(s) == d) 4 } 45、原生JavaScript返回IE浏览器的版本号 1 function getIE(){ 2 if (window.ActiveXObject){ 3 var v = navigator.userAgent.match(/MSIE ([^;]+)/)[1]; 4 return parseFloat(v.substring(0, v.indexOf("."))) 5 } 6 return false 7 } 46、原生JavaScript获取页面高度 1 function getPageHeight(){ 2 var g = document, a = g.body, f = g.documentElement, d = g.compatMode == "BackCompat" 3 ? a 4 : g.documentElement; 5 return Math.max(f.scrollHeight, a.scrollHeight, d.clientHeight); 6 } 47、原生JavaScript获取页面scrollLeft 1 function getPageScrollLeft(){ 2 var a = document; 3 return a.documentElement.scrollLeft || a.body.scrollLeft; 4 } 48、原生JavaScript获取页面可视宽度 1 function getPageViewWidth(){ 2 var d = document, a = d.compatMode == "BackCompat" 3 ? d.body 4 : d.documentElement; 5 return a.clientWidth; 6 } 49、原生JavaScript获取页面宽度 1 function getPageWidth(){ 2 var g = document, a = g.body, f = g.documentElement, d = g.compatMode == "BackCompat" 3 ? a 4 : g.documentElement; 5 return Math.max(f.scrollWidth, a.scrollWidth, d.clientWidth); 6 } 50、原生JavaScript获取页面scrollTop 1 function getPageScrollTop(){ 2 var a = document; 3 return a.documentElement.scrollTop || a.body.scrollTop; 4 } 51、原生JavaScript获取页面可视高度 1 function getPageViewHeight() { 2 var d = document, a = d.compatMode == "BackCompat" 3 ? d.body 4 : d.documentElement; 5 return a.clientHeight; 6 } 52、原生JavaScript跨浏览器添加事件 1 function addEvt(oTarget,sEvtType,fnHandle){ 2 if(!oTarget){return;} 3 if(oTarget.addEventListener){ 4 oTarget.addEventListener(sEvtType,fnHandle,false); 5 }else if(oTarget.attachEvent){ 6 oTarget.attachEvent("on" + sEvtType,fnHandle); 7 }else{ 8 oTarget["on" + sEvtType] = fnHandle; 9 } 10 } 53、原生JavaScript跨浏览器删除事件 1 function delEvt(oTarget,sEvtType,fnHandle){ 2 if(!oTarget){return;} 3 if(oTarget.addEventListener){ 4 oTarget.addEventListener(sEvtType,fnHandle,false); 5 }else if(oTarget.attachEvent){ 6 oTarget.attachEvent("on" + sEvtType,fnHandle); 7 }else{ 8 oTarget["on" + sEvtType] = fnHandle; 9 } 10 } 54、原生JavaScript去掉url前缀 1 function removeUrlPrefix(a){ 2 a=a.replace(/：/g,":").replace(/．/g,".").replace(/／/g,"/"); 3 while(trim(a).toLowerCase().indexOf("http://")==0){ 4 a=trim(a.replace(/http:\/\//i,"")); 5 } 6 return a; 7 } 55、原生JavaScript随机数时间戳 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 } 56、原生JavaScript全角半角转换,iCase: 0全到半，1半到全，其他不转化 1 function chgCase(sStr,iCase){ 2 if(typeof sStr != "string" || sStr.length <= 0 || !(iCase === 0 || iCase == 1)){ 3 return sStr; 4 } 5 var i,oRs=[],iCode; 6 if(iCase){/*半->全*/ 7 for(i=0; i<sStr.length;i+=1){ 8 iCode = sStr.charCodeAt(i); 9 if(iCode == 32){ 10 iCode = 12288; 11 }else if(iCode < 127){ 12 iCode += 65248; 13 } 14 oRs.push(String.fromCharCode(iCode)); 15 } 16 }else{/*全->半*/ 17 for(i=0; i<sStr.length;i+=1){ 18 iCode = sStr.charCodeAt(i); 19 if(iCode == 12288){ 20 iCode = 32; 21 }else if(iCode > 65280 && iCode < 65375){ 22 iCode -= 65248; 23 } 24 oRs.push(String.fromCharCode(iCode)); 25 } 26 } 27 return oRs.join(""); 28 } 57、原生JavaScript确认是否键盘有效输入值 1 function checkKey(iKey){ 2 if(iKey == 32 || iKey == 229){return true;}/*空格和异常*/ 3 if(iKey>47 && iKey < 58){return true;}/*数字*/ 4 if(iKey>64 && iKey < 91){return true;}/*字母*/ 5 if(iKey>95 && iKey < 108){return true;}/*数字键盘1*/ 6 if(iKey>108 && iKey < 112){return true;}/*数字键盘2*/ 7 if(iKey>185 && iKey < 193){return true;}/*符号1*/ 8 if(iKey>218 && iKey < 223){return true;}/*符号2*/ 9 return false; 10 } 58、原生JavaScript获取网页被卷去的位置 1 function getScrollXY() { 2 return document.body.scrollTop ? { 3 x: document.body.scrollLeft, 4 y: document.body.scrollTop 5 }: { 6 x: document.documentElement.scrollLeft, 7 y: document.documentElement.scrollTop 8 } 9 } 59、原生JavaScript另一种正则日期格式化函数+调用方法 1 Date.prototype.format = function(format){ //author: meizz 2 var o = { 3 "M+" : this.getMonth()+1, //month 4 "d+" : this.getDate(), //day 5 "h+" : this.getHours(), //hour 6 "m+" : this.getMinutes(), //minute 7 "s+" : this.getSeconds(), //second 8 "q+" : Math.floor((this.getMonth()+3)/3), //quarter 9 "S" : this.getMilliseconds() //millisecond 10 } 11 if(/(y+)/.test(format)) format=format.replace(RegExp.$1, 12 (this.getFullYear()+"").substr(4 - RegExp.$1.length)); 13 for(var k in o)if(new RegExp("("+ k +")").test(format)) 14 format = format.replace(RegExp.$1, 15 RegExp.$1.length==1 ? o[k] : 16 ("00"+ o[k]).substr((""+ o[k]).length)); 17 return format; 18 } 19 alert(new Date().format("yyyy-MM-dd hh:mm:ss")); 60、原生JavaScript时间个性化输出功能 1 /* 2 1、< 60s, 显示为“刚刚” 3 2、>= 1min && < 60 min, 显示与当前时间差“XX分钟前” 4 3、>= 60min && < 1day, 显示与当前时间差“今天 XX:XX” 5 4、>= 1day && < 1year, 显示日期“XX月XX日 XX:XX” 6 5、>= 1year, 显示具体日期“XXXX年XX月XX日 XX:XX” 7 */ 8 function timeFormat(time){ 9 var date = new Date(time) 10 , curDate = new Date() 11 , year = date.getFullYear() 12 , month = date.getMonth() + 1 13 , day = date.getDate() 14 , hour = date.getHours() 15 , minute = date.getMinutes() 16 , curYear = curDate.getFullYear() 17 , curHour = curDate.getHours() 18 , timeStr; 19 20 if(year < curYear){ 21 timeStr = year +‘年‘+ month +‘月‘+ day +‘日 ‘+ hour +‘:‘+ minute; 22 }else{ 23 var pastTime = curDate - date 24 , pastH = pastTime/3600000; 25 26 if(pastH > curHour){ 27 timeStr = month +‘月‘+ day +‘日 ‘+ hour +‘:‘+ minute; 28 }else if(pastH >= 1){ 29 timeStr = ‘今天 ‘ + hour +‘:‘+ minute +‘分‘; 30 }else{ 31 var pastM = curDate.getMinutes() - minute; 32 if(pastM > 1){ 33 timeStr = pastM +‘分钟前‘; 34 }else{ 35 timeStr = ‘刚刚‘; 36 } 37 } 38 } 39 return timeStr; 40 } 61、原生JavaScript解决offsetX兼容性问题 1 // 针对火狐不支持offsetX/Y 2 function getOffset(e){ 3 var target = e.target, // 当前触发的目标对象 4 eventCoord, 5 pageCoord, 6 offsetCoord; 7 8 // 计算当前触发元素到文档的距离 9 pageCoord = getPageCoord(target); 10 11 // 计算光标到文档的距离 12 eventCoord = { 13 X : window.pageXOffset + e.clientX, 14 Y : window.pageYOffset + e.clientY 15 }; 16 17 // 相减获取光标到第一个定位的父元素的坐标 18 offsetCoord = { 19 X : eventCoord.X - pageCoord.X, 20 Y : eventCoord.Y - pageCoord.Y 21 }; 22 return offsetCoord; 23 } 24 25 function getPageCoord(element){ 26 var coord = { X : 0, Y : 0 }; 27 // 计算从当前触发元素到根节点为止， 28 // 各级 offsetParent 元素的 offsetLeft 或 offsetTop 值之和 29 while (element){ 30 coord.X += element.offsetLeft; 31 coord.Y += element.offsetTop; 32 element = element.offsetParent; 33 } 34 return coord; 35 } 62、原生JavaScript常用的正则表达式 1 //正整数 2 /^[0-9]*[1-9][0-9]*$/; 3 //负整数 4 /^-[0-9]*[1-9][0-9]*$/; 5 //正浮点数 6 /^(([0-9]+\.[0-9]*[1-9][0-9]*)|([0-9]*[1-9][0-9]*\.[0-9]+)|([0-9]*[1-9][0-9]*))$/; 7 //负浮点数 8 /^(-(([0-9]+\.[0-9]*[1-9][0-9]*)|([0-9]*[1-9][0-9]*\.[0-9]+)|([0-9]*[1-9][0-9]*)))$/; 9 //浮点数 10 /^(-?\d+)(\.\d+)?$/; 11 //email地址 12 /^[\w-]+(\.[\w-]+)*@[\w-]+(\.[\w-]+)+$/; 13 //url地址 14 /^[a-zA-z]+://(\w+(-\w+)*)(\.(\w+(-\w+)*))*(\?\S*)?$/; 15 //年/月/日（年-月-日、年.月.日） 16 /^(19|20)\d\d[- /.](0[1-9]|1[012])[- /.](0[1-9]|[12][0-9]|3[01])$/; 17 //匹配中文字符 18 /[\u4e00-\u9fa5]/; 19 //匹配帐号是否合法(字母开头，允许5-10字节，允许字母数字下划线) 20 /^[a-zA-Z][a-zA-Z0-9_]{4,9}$/; 21 //匹配空白行的正则表达式 22 /\n\s*\r/; 23 //匹配中国邮政编码 24 /[1-9]\d{5}(?!\d)/; 25 //匹配身份证 26 /\d{15}|\d{18}/; 27 //匹配国内电话号码 28 /(\d{3}-|\d{4}-)?(\d{8}|\d{7})?/; 29 //匹配IP地址 30 /((2[0-4]\d|25[0-5]|[01]?\d\d?)\.){3}(2[0-4]\d|25[0-5]|[01]?\d\d?)/; 31 //匹配首尾空白字符的正则表达式 32 /^\s*|\s*$/; 33 //匹配HTML标记的正则表达式 34 < (\S*?)[^>]*>.*?|< .*? />; 63、原生JavaScript实现返回顶部的通用方法 1 function backTop(btnId) { 2 var btn = document.getElementById(btnId); 3 var d = document.documentElement; 4 var b = document.body; 5 window.onscroll = set; 6 btn.style.display = "none"; 7 btn.onclick = function() { 8 btn.style.display = "none"; 9 window.onscroll = null; 10 this.timer = setInterval(function() { 11 d.scrollTop -= Math.ceil((d.scrollTop + b.scrollTop) * 0.1); 12 b.scrollTop -= Math.ceil((d.scrollTop + b.scrollTop) * 0.1); 13 if ((d.scrollTop + b.scrollTop) == 0) clearInterval(btn.timer, window.onscroll = set); 14 }, 15 10); 16 }; 17 function set() { 18 btn.style.display = (d.scrollTop + b.scrollTop > 100) ? ‘block‘: "none" 19 } 20 }; 21 backTop(‘goTop‘); 64、原生JavaScript获得URL中GET参数值 1 // 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"] 2 function get_get(){ 3 querystr = window.location.href.split("?") 4 if(querystr[1]){ 5 GETs = querystr[1].split("&") 6 GET =new Array() 7 for(i=0;i<GETs.length;i++){ 8 tmp_arr = GETs[i].split("=") 9 key=tmp_arr[0] 10 GET[key] = tmp_arr[1] 11 } 12 } 13 return querystr[1]; 14 } 65、原生JavaScript实现全选通用方法 1 function checkall(form, prefix, checkall) { 2 var checkall = checkall ? checkall : ‘chkall‘; 3 for(var i = 0; i < form.elements.length; i++) { 4 var e = form.elements[i]; 5 if(e.type=="checkbox"){ 6 e.checked = form.elements[checkall].checked; 7 } 8 } 9 } 66、原生JavaScript实现全部取消选择通用方法 1 function uncheckAll(form) { 2 for (var i=0;i<form.elements.length;i++){ 3 var e = form.elements[i]; 4 if (e.name != ‘chkall‘) 5 e.checked=!e.checked; 6 } 7 } 67、原生JavaScript实现打开一个窗体通用方法 1 function openWindow(url,windowName,width,height){ 2 var x = parseInt(screen.width / 2.0) - (width / 2.0); 3 var y = parseInt(screen.height / 2.0) - (height / 2.0); 4 var isMSIE= (navigator.appName == "Microsoft Internet Explorer"); 5 if (isMSIE) { 6 var p = "resizable=1,location=no,scrollbars=no,width="; 7 p = p+width; 8 p = p+",height="; 9 p = p+height; 10 p = p+",left="; 11 p = p+x; 12 p = p+",top="; 13 p = p+y; 14 retval = window.open(url, windowName, p); 15 } else { 16 var win = window.open(url, "ZyiisPopup", "top=" + y + ",left=" + x + ",scrollbars=" + scrollbars + ",dialog=yes,modal=yes,width=" + width + ",height=" + height + ",resizable=no" ); 17 eval("try { win.resizeTo(width, height); } catch(e) { }"); 18 win.focus(); 19 } 20 } 68、原生JavaScript判断是否为客户端设备 1 function client(o){ 2 var b = navigator.userAgent.toLowerCase(); 3 var t = false; 4 if (o == ‘isOP‘){ 5 t = b.indexOf(‘opera‘) > -1; 6 } 7 if (o == ‘isIE‘){ 8 t = b.indexOf(‘msie‘) > -1; 9 } 10 if (o == ‘isFF‘){ 11 t = b.indexOf(‘firefox‘) > -1; 12 } 13 return t; 14 } 69、原生JavaScript获取单选按钮的值 1 function get_radio_value(field){ 2 if(field&&field.length){ 3 for(var i=0;i<field.length;i++){ 4 if(field[i].checked){ 5 return field[i].value; 6 } 7 } 8 }else { 9 return ; 10 } 11 } 70、原生JavaScript获取复选框的值 1 function get_checkbox_value(field){ 2 if(field&&field.length){ 3 for(var i=0;i<field.length;i++){ 4 if(field[i].checked && !field[i].disabled){ 5 return field[i].value; 6 } 7 } 8 }else { 9 return; 10 } 11 } 71、原生JavaScript判断是否为邮箱 1 function isEmail(str){ 2 var re=/^\w+((-\w+)|(\.\w+))*\@[A-Za-z0-9]+((\.|-)[A-Za-z0-9]+)*\.[A-Za-z0-9]+$/; 3 if (re.test(str) != true) { 4 return false; 5 }else{ 6 return true; 7 } 8 } 72、原生JavaScript判断是否有列表中的危险字符 1 function isValidReg(chars){ 2 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|■|▄|▆|\*|@|#|\^|\\/; 3 if (re.test( chars) == true) { 4 return false; 5 }else{ 6 return true; 7 } 8 } 73、原生JavaScript判断字符串是否大于规定的长度 1 function isValidLength(chars, len) { 2 if (chars.length < len) { 3 return false; 4 } 5 return true; 6 } 74、原生JavaScript判断字符串是为网址不区分大小写 1 function isValidURL( chars ) { 2 var re=/^([hH][tT]{2}[pP]:\/\/|[hH][tT]{2}[pP][sS]:\/\/)(\S+\.\S+)$/; 3 if (!isNULL(chars)) { 4 chars = jsTrim(chars); 5 if (chars.match(re) == null) 6 return false; 7 else 8 return true; 9 } 10 return false; 11 } 75、原生JavaScript判断字符串是否为小数 1 function isValidDecimal( chars ) { 2 var re=/^\d*\.?\d{1,2}$/; 3 if (chars.match(re) == null) 4 return false; 5 else 6 return true; 7 } 76、原生JavaScript判断字符串是否为整数 1 function isNumber( chars ) { 2 var re=/^\d*$/; 3 if (chars.match(re) == null) 4 return false; 5 else 6 return true; 7 } 77、原生JavaScript判断字符串是否为浮点数 1 function isFloat( str ) { 2 for(i=0;i<str.length;i++) { 3 if ((str.charAt(i)<"0" || str.charAt(i)>"9")&& str.charAt(i) != ‘.‘){ 4 return false; 5 } 6 } 7 return true; 8 } 78、原生JavaScript判断字符是否为A-Za-z英文字母 1 function isLetters( str ){ 2 var re=/^[A-Za-z]+$/; 3 if (str.match(re) == null) 4 return false; 5 else 6 return true; 7 } 79、原生JavaScript判断字符串是否邮政编码 1 function isValidPost( chars ) { 2 var re=/^\d{6}$/; 3 if (chars.match(re) == null) 4 return false; 5 else 6 return true; 7 } 80、原生JavaScript判断字符是否空NULL 1 function isNULL( chars ) { 2 if (chars == null) 3 return true; 4 if (jsTrim(chars).length==0) 5 return true; 6 return false; 7 } 81、原生JavaScript用正则表达式提取页面代码中所有网址 1 var aa = document.documentElement.outerHTML.match(/(url\(|src=http://www.mamicode.com/|href=)[/"\‘]*([^\"\‘\(\)\<\>\[\] ]+)[\"\‘\)]*|(http:\/\/[\w\-\.]+[^\"\‘\(\)\<\>\[\] ]+)/ig).join("\r\n").replace(/^(src=http://www.mamicode.com/|href=|url/()[/"\‘]*|[\"\‘\>\) ]*$/igm,""); 2 alert(aa) 82、原生JavaScript用正则表达式清除相同的数组(低效率) 1 Array.prototype.unique=function(){ 2 return this.reverse().join(",").match(/([^,]+)(?!.*\1)/ig).reverse(); 3 } 83、原生JavaScript用正则表达式清除相同的数组(高效率) 1 String.prototype.unique=function(){ 2 var x=this.split(/[\r\n]+/); 3 var y=‘‘; 4 for(var i=0;i<x.length;i++){ 5 if(!new RegExp("^"+x[i].replace(/([^\w])/ig,"\\$1")+"$","igm").test(y)){ 6 y+=x[i]+"\r\n" 7 } 8 } 9 return y 10 } 84、原生JavaScript用正则表达式按字母排序，对每行进行数组排序 1 function SetSort(){ 2 var text=K1.value.split(/[\r\n]/).sort().join("\r\n");//顺序 3 var test=K1.value.split(/[\r\n]/).sort().reverse().join("\r\n");//反序 4 K1.value=http://www.mamicode.com/K1.value!=text?text:test; 5 } 85、原生JavaScript字符串反序 1 function IsReverse(text){ 2 return text.split(‘‘).reverse().join(‘‘); 3 } 86、原生JavaScript用正则表达式清除html代码中的脚本 1 function clear_script(){ 2 K1.value=http://www.mamicode.com/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 } 87、原生JavaScript动态执行JavaScript脚本 1 function javascript(){ 2 try{ 3 eval(K1.value); 4 }catch(e){ 5 alert(e.message); 6 } 7 } 88、原生JavaScript动态执行VBScript脚本 1 function vbscript(){ 2 try{ 3 var script=document.getElementById("K1").value; 4 if(script.trim()=="")return; 5 window.execScript(‘On Error Resume Next \n‘+script+‘\n If Err.Number<>0 Then \n MsgBox "请输入正确的VBScript脚本!",48,"脚本错误!" \n End If‘,"vbscript") 6 }catch(e){ 7 alert(e.message); 8 } 9 } 89、原生JavaScript实现金额大写转换函数 1 function transform(tranvalue) { 2 try { 3 var i = 1; 4 var dw2 = new Array("", "万", "亿"); //大单位 5 var dw1 = new Array("拾", "佰", "仟"); //小单位 6 var dw = new Array("零", "壹", "贰", "叁", "肆", "伍", "陆", "柒", "捌", "玖"); //整数部分用 7 //以下是小写转换成大写显示在合计大写的文本框中 8 //分离整数与小数 9 var source = splits(tranvalue); 10 var num = source[0]; 11 var dig = source[1]; 12 //转换整数部分 13 var k1 = 0; //计小单位 14 var k2 = 0; //计大单位 15 var sum = 0; 16 var str = ""; 17 var len = source[0].length; //整数的长度 18 for (i = 1; i <= len; i++) { 19 var n = source[0].charAt(len - i); //取得某个位数上的数字 20 var bn = 0; 21 if (len - i - 1 >= 0) { 22 bn = source[0].charAt(len - i - 1); //取得某个位数前一位上的数字 23 } 24 sum = sum + Number(n); 25 if (sum != 0) { 26 str = dw[Number(n)].concat(str); //取得该数字对应的大写数字，并插入到str字符串的前面 27 if (n == ‘0‘) sum = 0; 28 } 29 if (len - i - 1 >= 0) { //在数字范围内 30 if (k1 != 3) { //加小单位 31 if (bn != 0) { 32 str = dw1[k1].concat(str); 33 } 34 k1++; 35 } else { //不加小单位，加大单位 36 k1 = 0; 37 var temp = str.charAt(0); 38 if (temp == "万" || temp == "亿") //若大单位前没有数字则舍去大单位 39 str = str.substr(1, str.length - 1); 40 str = dw2[k2].concat(str); 41 sum = 0; 42 } 43 } 44 if (k1 == 3) //小单位到千则大单位进一 45 { 46 k2++; 47 } 48 } 49 //转换小数部分 50 var strdig = ""; 51 if (dig != "") { 52 var n = dig.charAt(0); 53 if (n != 0) { 54 strdig += dw[Number(n)] + "角"; //加数字 55 } 56 var n = dig.charAt(1); 57 if (n != 0) { 58 strdig += dw[Number(n)] + "分"; //加数字 59 } 60 } 61 str += "元" + strdig; 62 } catch(e) { 63 return "0元"; 64 } 65 return str; 66 } 67 //拆分整数与小数 68 function splits(tranvalue) { 69 var value = http://www.mamicode.com/new Array(‘‘, ‘‘); 70 temp = tranvalue.split("."); 71 for (var i = 0; i < temp.length; i++) { 72 value[i] = temp[i]; 73 } 74 return value; 75 } 90、原生JavaScript常用的正则表达式大收集 1 匹配中文字符的正则表达式： [\u4e00-\u9fa5] 2 匹配双字节字符（包括汉字在内）：[^\x00-\xff] 3 匹配空行的正则表达式：\n[\s| ]*\r 4 匹配 HTML 标记的正则表达式：<(.*)>.*<\/\1>|<(.*) \/> 5 匹配首尾空格的正则表达式：(^\s*)|(\s*$) 6 匹配 IP 地址的正则表达式：/(\d+)\.(\d+)\.(\d+)\.(\d+)/g 7 匹配 Email 地址的正则表达式：\w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)* 8 匹配网址 URL 的正则表达式：http://(/[\w-]+\.)+[\w-]+(/[\w- ./?%&=]*)? 9 sql 语句：^(select|drop|delete|create|update|insert).*$ 10 非负整数：^\d+$ 11 正整数：^[0-9]*[1-9][0-9]*$ 12 非正整数：^((-\d+)|(0+))$ 13 负整数：^-[0-9]*[1-9][0-9]*$ 14 整数：^-?\d+$ 15 非负浮点数：^\d+(\.\d+)?$ 16 正浮点数：^((0-9)+\.[0-9]*[1-9][0-9]*)|([0-9]*[1-9][0-9]*\.[0-9]+)|([0-9]*[1-9][0-9]*))$ 17 非正浮点数：^((-\d+\.\d+)?)|(0+(\.0+)?))$ 18 英文字符串：^[A-Za-z]+$ 19 英文大写串：^[A-Z]+$ 20 英文小写串：^[a-z]+$ 21 英文字符数字串：^[A-Za-z0-9]+$ 22 英数字加下划线串：^\w+$ 23 E-mail地址：^[\w-]+(\.[\w-]+)*@[\w-]+(\.[\w-]+)+$ 24 URL：^[a-zA-Z]+://(\w+(-\w+)*)(\.(\w+(-\w+)*))*(\?\s*)?$ 或：^http:\/\/[A-Za-z0-9]+\.[A-Za-z0-9]+[\/=\?%\-&_~`@[\]\‘:+!]*([^<>\"\"])*$ 25 邮政编码：^[1-9]\d{5}$ 26 电话号码：^((\(\d{2,3}\))|(\d{3}\-))?(\(0\d{2,3}\)|0\d{2,3}-)?[1-9]\d{6,7}(\-\d{1,4})?$ 27 手机号码：^((\(\d{2,3}\))|(\d{3}\-))?13\d{9}$ 28 双字节字符（包括汉字在内）：^\x00-\xff 29 匹配首尾空格：(^\s*)|(\s*$) 30 匹配 HTML 标记：<(.*)>.*<\/\1>|<(.*) \/> 31 匹配空行：\n[\s| ]*\r 32 提取信息中的网络链接：(h|H)(r|R)(e|E)(f|F) *= *(‘|")?(\w|\\|\/|\.)+(‘|"| *|>)? 33 提取信息中的邮件地址：\w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)* 34 提取信息中的图片链接：(s|S)(r|R)(c|C) *= *(‘|")?(\w|\\|\/|\.)+(‘|"| *|>)? 35 提取信息中的 IP 地址：(\d+)\.(\d+)\.(\d+)\.(\d+) 36 提取信息中的中国手机号码：(86)*0*13\d{9} 37 提取信息中的中国固定电话号码：(\(\d{3,4}\)|\d{3,4}-|\s)?\d{8} 38 提取信息中的中国电话号码（包括移动和固定电话）：(\(\d{3,4}\)|\d{3,4}-|\s)?\d{7,14} 39 提取信息中的中国邮政编码：[1-9]{1}(\d+){5} 40 提取信息中的浮点数（即小数）：(-?\d*)\.?\d+ 41 提取信息中的任何数字 ：(-?\d*)(\.\d+)? 42 IP：(\d+)\.(\d+)\.(\d+)\.(\d+) 43 电话区号：^0\d{2,3}$ 44 腾讯 QQ 号：^[1-9]*[1-9][0-9]*$ 45 帐号（字母开头，允许 5-16 字节，允许字母数字下划线）：^[a-zA-Z][a-zA-Z0-9_]{4,15}$ 46 中文、英文、数字及下划线：^[\u4e00-\u9fa5_a-zA-Z0-9]+$ 91、原生JavaScript实现窗体改变事件resize的操作（兼容所以的浏览器） 1 (function(){ 2 var fn = function(){ 3 var w = document.documentElement ? document.documentElement.clientWidth : document.body.clientWidth 4 ,r = 1255 5 ,b = Element.extend(document.body) 6 ,classname = b.className; 7 if(w < r){ 8 //当窗体的宽度小于1255的时候执行相应的操作 9 }else{ 10 //当窗体的宽度大于1255的时候执行相应的操作 11 } 12 } 13 if(window.addEventListener){ 14 window.addEventListener(‘resize‘, function(){ fn(); }); 15 }else if(window.attachEvent){ 16 window.attachEvent(‘onresize‘, function(){ fn(); }); 17 } 18 fn(); 19 })(); 92、原生JavaScript用正则清除空格分左右 1 function ltrim(s){ return s.replace( /^(\s*| *)/, ""); } 2 function rtrim(s){ return s.replace( /(\s*| *)$/, ""); } 3 function trim(s){ return ltrim(rtrim(s));} 93、原生JavaScript判断变量是否空值 1 /** 2 * 判断变量是否空值 3 * undefined, null, ‘‘, false, 0, [], {} 均返回true，否则返回false 4 */ 5 function empty(v){ 6 switch (typeof v){ 7 case ‘undefined‘ : return true; 8 case ‘string‘ : if(trim(v).length == 0) return true; break; 9 case ‘boolean‘ : if(!v) return true; break; 10 case ‘number‘ : if(0 === v) return true; break; 11 case ‘object‘ : 12 if(null === v) return true; 13 if(undefined !== v.length && v.length==0) return true; 14 for(var k in v){return false;} return true; 15 break; 16 } 17 return false; 18 } 94、原生JavaScript实现base64解码 1 function base64_decode(data){ 2 var b64 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/="; 3 var o1, o2, o3, h1, h2, h3, h4, bits, i = 0,ac = 0,dec = "",tmp_arr = []; 4 if (!data) { return data; } 5 data += ‘‘; 6 do { 7 h1 = b64.indexOf(data.charAt(i++)); 8 h2 = b64.indexOf(data.charAt(i++)); 9 h3 = b64.indexOf(data.charAt(i++)); 10 h4 = b64.indexOf(data.charAt(i++)); 11 bits = h1 << 18 | h2 << 12 | h3 << 6 | h4; 12 o1 = bits >> 16 & 0xff; 13 o2 = bits >> 8 & 0xff; 14 o3 = bits & 0xff; 15 if (h3 == 64) { 16 tmp_arr[ac++] = String.fromCharCode(o1); 17 } else if (h4 == 64) { 18 tmp_arr[ac++] = String.fromCharCode(o1, o2); 19 } else { 20 tmp_arr[ac++] = String.fromCharCode(o1, o2, o3); 21 } 22 } while (i < data.length); 23 dec = tmp_arr.join(‘‘); 24 dec = utf8_decode(dec); 25 return dec; 26 } 95、原生JavaScript实现utf8解码 1 function utf8_decode(str_data){ 2 var tmp_arr = [],i = 0,ac = 0,c1 = 0,c2 = 0,c3 = 0;str_data += ‘‘; 3 while (i < str_data.length) { 4 c1 = str_data.charCodeAt(i); 5 if (c1 < 128) { 6 tmp_arr[ac++] = String.fromCharCode(c1); 7 i++; 8 } else if (c1 > 191 && c1 < 224) { 9 c2 = str_data.charCodeAt(i + 1); 10 tmp_arr[ac++] = String.fromCharCode(((c1 & 31) << 6) | (c2 & 63)); 11 i += 2; 12 } else { 13 c2 = str_data.charCodeAt(i + 1); 14 c3 = str_data.charCodeAt(i + 2); 15 tmp_arr[ac++] = String.fromCharCode(((c1 & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63)); 16 i += 3; 17 } 18 } 19 return tmp_arr.join(‘‘); 20 } 96、原生JavaScript获取窗体可见范围的宽与高 1 function getViewSize(){ 2 var de=document.documentElement; 3 var db=document.body; 4 var viewW=de.clientWidth==0 ? db.clientWidth : de.clientWidth; 5 var viewH=de.clientHeight==0 ? db.clientHeight : de.clientHeight; 6 return Array(viewW ,viewH); 7 } 97、原生JavaScript判断IE版本号（既简洁、又向后兼容！） 1 var _IE = (function(){ 2 var v = 3, div = document.createElement(‘div‘), all = div.getElementsByTagName(‘i‘); 3 while ( 4 div.innerHTML = ‘<!--[if gt IE ‘ + (++v) + ‘]><i></i><![endif]-->‘, 5 all[0] 6 ); 7 return v > 4 ? v : false ; 8 }()); 98、原生JavaScript获取浏览器版本号 1 function browserVersion(types) { 2 var other = 1; 3 for (i in types) { 4 var v = types[i] ? types[i] : i; 5 if (USERAGENT.indexOf(v) != -1) { 6 var re = new RegExp(v + ‘(\\/|\\s|:)([\\d\\.]+)‘, ‘ig‘); 7 var matches = re.exec(USERAGENT); 8 var ver = matches != null ? matches[2] : 0; 9 other = ver !== 0 && v != ‘mozilla‘ ? 0 : other; 10 } else { 11 var ver = 0; 12 } 13 eval(‘BROWSER.‘ + i + ‘= ver‘); 14 } 15 BROWSER.other = other; 16 } 99、原生JavaScript半角转换为全角函数 1 function ToDBC(str){ 2 var result = ‘‘; 3 for(var i=0; i < str.length; i++){ 4 code = str.charCodeAt(i); 5 if(code >= 33 && code <= 126){ 6 result += String.fromCharCode(str.charCodeAt(i) + 65248); 7 }else if (code == 32){ 8 result += String.fromCharCode(str.charCodeAt(i) + 12288 - 32); 9 }else{ 10 result += str.charAt(i); 11 } 12 } 13 return result; 14 } 100、原生JavaScript全角转换为半角函数 1 function ToCDB(str){ 2 var result = ‘‘; 3 for(var i=0; i < str.length; i++){ 4 code = str.charCodeAt(i); 5 if(code >= 65281 && code <= 65374){ 6 result += String.fromCharCode(str.charCodeAt(i) - 65248); 7 }else if (code == 12288){ 8 result += String.fromCharCode(str.charCodeAt(i) - 12288 + 32); 9 }else{ 10 result += str.charAt(i); 11 } 12 } 13 return result; 14 }
JavaScript实用功能代码片段
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