原生态纯JavaScript 100大技巧大收集---你值得拥有

1、原生JavaScript实现字符串长度截取

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获取域名主机

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替换全部

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

5、原生JavaScript转义html标签

function HtmlEncode(text) {return text.replace(/&/g, '&').replace(/\"/g, '"').replace(/</g, '<').replace(/>/g, '>')
}

6、原生JavaScript还原html标签

function HtmlDecode(text) {return text.replace(/&/g, '&').replace(/"/g, '\"').replace(/</g, '<').replace(/>/g, '>')
}

7、原生JavaScript时间日期格式转换

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判断是否为数字类型

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

9、原生JavaScript设置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获取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加入收藏夹

function AddFavorite(sURL, sTitle) {try {window.external.addFavorite(sURL, sTitle)} catch(e) {try {window.sidebar.addPanel(sTitle, sURL, "")} catch(e) {alert("加入收藏失败，请使用Ctrl+D进行添加")}}
}

12、原生JavaScript设为首页

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("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")}}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判断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加载样式文件

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返回脚本内容

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清除脚本内容

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

17、原生JavaScript动态加载脚本文件

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. = false;scriptNode.onload = function () {scriptNode. = true;JSLOADED[src] = 1;};scriptNode.onreadystatechange = function () {if((scriptNode.readyState == 'loaded' || scriptNode.readyState == 'complete') && !scriptNode. {scriptNode. = 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检索的元素对象

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

19、原生JavaScript返回浏览器版本内容

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元素显示的通用方法

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,可惜却没有insertAfter方法?用如下函数实现

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中兼容浏览器绑定元素事件

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光标停在文字的后面，文本框获得焦点时调用

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检验URL链接是否有效

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样式代码

function formatCss(s){//格式化代码s = s.replace(/\s*([\{\}\:\;\,])\s*/g, "$1");s = s.replace(/;\s*;/g, ";"); //清除连续分号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压缩CSS样式代码

function yasuoCss (s) {//压缩代码s = s.replace(/\/\*(.|\n)*?\*\//g, ""); //删除注释s = s.replace(/\s*([\{\}\:\;\,])\s*/g, "$1");s = s.replace(/\,[\s\.\#\d]*\{/g, "{"); //容错处理s = s.replace(/;\s*;/g, ";"); //清除连续分号s = s.match(/^\s*(\S+(\s+\S+)*)\s*$/); //去掉首尾空白return (s == null) ? "" : s[1];
}

27、原生JavaScript获取当前路径

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

28、原生JavaScriptIP转成整型

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整型解析为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实现checkbox全选与全不选

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;}}
}

(31~40)移动篇
31、原生JavaScript判断是否移动设备

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判断是否移动设备访问

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

33、原生JavaScript判断是否苹果移动设备访问

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

34、原生JavaScript判断是否安卓移动设备访问

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

35、原生JavaScript判断是否Touch屏幕

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

36、原生JavaScript判断是否在安卓上的谷歌浏览器

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判断是否打开视窗

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

38、原生JavaScript获取移动设备初始化大小

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获取移动设备最大化大小

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获取移动设备屏幕宽度

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完美判断是否为网址

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;}
}

42、原生JavaScript根据样式名称检索元素对象

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
}

43、原生JavaScript判断是否以某个字符串开头

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

44、原生JavaScript判断是否以某个字符串结束

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浏览器的版本号

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获取页面高度

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获取页面scrollLeft

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

48、原生JavaScript获取页面可视宽度

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

49、原生JavaScript获取页面宽度

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获取页面scrollTop

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

51、原生JavaScript获取页面可视高度

56、原生JavaScript全角半角转换,iCase: 0全到半，1半到全，其他不转化

58、原生JavaScript获取网页被卷去的位置

61、原生JavaScript解决offsetX兼容性问题

// 针对火狐不支持offsetX/Y
function getOffset(e){var target = e.target, // 当前触发的目标对象eventCoord,pageCoord,offsetCoord;// 计算当前触发元素到文档的距离pageCoord = getPageCoord(target);// 计算光标到文档的距离eventCoord = {X : window.pageXOffset + e.clientX,Y : window.pageYOffset + e.clientY};// 相减获取光标到第一个定位的父元素的坐标offsetCoord = {X : eventCoord.X - pageCoord.X,Y : eventCoord.Y - pageCoord.Y};return offsetCoord;
}function getPageCoord(element){var coord = { X : 0, Y : 0 };// 计算从当前触发元素到根节点为止，// 各级 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;
}

62、原生JavaScript常用的正则表达式

//正整数
/^[0-9]*[1-9][0-9]*$/;
//负整数
/^-[0-9]*[1-9][0-9]*$/;
//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]*))$/;
//负浮点数
/^(-(([0-9]+\.[0-9]*[1-9][0-9]*)|([0-9]*[1-9][0-9]*\.[0-9]+)|([0-9]*[1-9][0-9]*)))$/;
//浮点数
/^(-?\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)
/^[a-zA-Z][a-zA-Z0-9_]{4,9}$/;
//匹配空白行的正则表达式
/\n\s*\r/;
//匹配中国邮政编码
/[1-9]\d{5}(?!\d)/;
//匹配×××
/\d{15}|\d{18}/;
//匹配国内电话号码
/(\d{3}-|\d{4}-)?(\d{8}|\d{7})?/;
//匹配IP地址
/((2[0-4]\d|25[0-5]|[01]?\d\d?)\.){3}(2[0-4]\d|25[0-5]|[01]?\d\d?)/;
//匹配首尾空白字符的正则表达式
/^\s*|\s*$/;
//匹配HTML标记的正则表达式
< (\S*?)[^>]*>.*?|< .*? />;

63、原生JavaScript实现返回顶部的通用方法

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');

64、原生JavaScript获得URL中GET参数值

// 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];
}

65、原生JavaScript实现全选通用方法

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;}}
}

66、原生JavaScript实现全部取消选择通用方法

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;}
}

67、原生JavaScript实现打开一个窗体通用方法

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();}
}

68、原生JavaScript判断是否为客户端设备

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;
}

69、原生JavaScript获取单选按钮的值

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 ;                }
}

70、原生JavaScript获取复选框的值

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;}
}

(71~80)验证篇这一篇文章主要是10个比较常用表单验证功能，包括了邮箱、危险字符、验证长度、验证网址、验证小数、整数、浮点数等常用的验证，有了这些代码片段，平时的表单验证也可以不需要jquery的验证插件了，希望可以帮到大家。。。
71、原生JavaScript判断是否为邮箱

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;}
}

72、原生JavaScript判断是否有列表中的危险字符

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;}
}

73、原生JavaScript判断字符串是否大于规定的长度

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

74、原生JavaScript判断字符串是为网址不区分大小写

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;
}

75、原生JavaScript判断字符串是否为小数

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

76、原生JavaScript判断字符串是否为整数

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

77、原生JavaScript判断字符串是否为浮点数

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;
}

78、原生JavaScript判断字符是否为A-Za-z英文字母

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

79、原生JavaScript判断字符串是否邮政编码

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

80、原生JavaScript判断字符是否空NULL

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

81、原生JavaScript用正则表达式提取页面代码中所有网址

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

82、原生JavaScript用正则表达式清除相同的数组(低效率)

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

83、原生JavaScript用正则表达式清除相同的数组(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
}

84、原生JavaScript用正则表达式按字母排序，对每行进行数组排序

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

85、原生JavaScript字符串反序

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

86、原生JavaScript用正则表达式清除html代码中的脚本

function clear_script(){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,"");
}

87、原生JavaScript动态执行JavaScript脚本

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

88、原生JavaScript动态执行VBScript脚本

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 "请输入正确的VBScript脚本!",48,"脚本错误!" \n End If',"vbscript")}catch(e){alert(e.message);}
}

89、原生JavaScript实现金额大写转换函数

function transform(tranvalue) {try {var i = 1;var dw2 = new Array("", "万", "亿"); //大单位var dw1 = new Array("拾", "佰", "仟"); //小单位var dw = new Array("零", "壹", "贰", "叁", "肆", "伍", "陆", "柒", "捌", "玖"); //整数部分用//以下是小写转换成大写显示在合计大写的文本框中     //分离整数与小数var source = splits(tranvalue);var num = source[0];var dig = source[1];//转换整数部分var k1 = 0; //计小单位var k2 = 0; //计大单位var sum = 0;var str = "";var len = source[0].length; //整数的长度for (i = 1; i <= len; i++) {var n = source[0].charAt(len - i); //取得某个位数上的数字var bn = 0;if (len - i - 1 >= 0) {bn = source[0].charAt(len - i - 1); //取得某个位数前一位上的数字}sum = sum + Number(n);if (sum != 0) {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if (n == '0') sum = 0;}if (len - i - 1 >= 0) { //在数字范围内if (k1 != 3) { //加小单位if (bn != 0) {str = dw1[k1].concat(str);}k1++;} else { //不加小单位，加大单位k1 = 0;var temp = str.charAt(0);if (temp == "万" || temp == "亿") //若大单位前没有数字则舍去大单位str = str.substr(1, str.length - 1);str = dw2[k2].concat(str);sum = 0;}}if (k1 == 3) //小单位到千则大单位进一{k2++;}}//转换小数部分var strdig = "";if (dig != "") {var n = dig.charAt(0);if (n != 0) {strdig += dw[Number(n)] + "角"; //加数字}var n = dig.charAt(1);if (n != 0) {strdig += dw[Number(n)] + "分"; //加数字}}str += "元" + strdig;} catch(e) {return "0元";}return str;
}
//拆分整数与小数
function splits(tranvalue) {var value = new Array('', '');temp = tranvalue.split(".");for (var i = 0; i < temp.length; i++) {value[i] = temp[i];}return value;
}

90、原生JavaScript常用的正则表达式大收集

匹配中文字符的正则表达式： [\u4e00-\u9fa5]
匹配双字节字符（包括汉字在内）：[^\x00-\xff]
匹配空行的正则表达式：\n[\s| ]*\r
匹配 HTML 标记的正则表达式：<(.*)>.*<\/\1>|<(.*) \/>
匹配首尾空格的正则表达式：(^\s*)|(\s*$)
匹配 IP 地址的正则表达式：/(\d+)\.(\d+)\.(\d+)\.(\d+)/g
匹配 Email 地址的正则表达式：\w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*
匹配网址 URL 的正则表达式：http://(/[\w-]+\.)+[\w-]+(/[\w- ./?%&=]*)?
sql 语句：^(select|drop|delete|create|update|insert).*$
非负整数：^\d+$
正整数：^[0-9]*[1-9][0-9]*$
非正整数：^((-\d+)|(0+))$
负整数：^-[0-9]*[1-9][0-9]*$
整数：^-?\d+$
非负浮点数：^\d+(\.\d+)?$
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]*))$
非正浮点数：^((-\d+\.\d+)?)|(0+(\.0+)?))$
英文字符串：^[A-Za-z]+$
英文大写串：^[A-Z]+$
英文小写串：^[a-z]+$
英文字符数字串：^[A-Za-z0-9]+$
英数字加下划线串：^\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]+[\/=\?%\-&_~`@[\]\':+!]*([^<>\"\"])*$
邮政编码：^[1-9]\d{5}$
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})?$
手机号码：^((\(\d{2,3}\))|(\d{3}\-))?13\d{9}$
双字节字符（包括汉字在内）：^\x00-\xff
匹配首尾空格：(^\s*)|(\s*$)
匹配 HTML 标记：<(.*)>.*<\/\1>|<(.*) \/>
匹配空行：\n[\s| ]*\r
提取信息中的网络链接：(h|H)(r|R)(e|E)(f|F) *= *('|")?(\w|\\|\/|\.)+('|"| *|>)?
提取信息中的邮件地址：\w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*
提取信息中的图片链接：(s|S)(r|R)(c|C) *= *('|")?(\w|\\|\/|\.)+('|"| *|>)?
提取信息中的 IP 地址：(\d+)\.(\d+)\.(\d+)\.(\d+)
提取信息中的中国手机号码：(86)*0*13\d{9}
提取信息中的中国固定电话号码：(\(\d{3,4}\)|\d{3,4}-|\s)?\d{8}
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}
提取信息中的中国邮政编码：[1-9]{1}(\d+){5}
提取信息中的浮点数（即小数）：(-?\d*)\.?\d+
提取信息中的任何数字 ：(-?\d*)(\.\d+)?
IP：(\d+)\.(\d+)\.(\d+)\.(\d+)
电话区号：^0\d{2,3}$
腾讯 QQ 号：^[1-9]*[1-9][0-9]*$
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}$
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）

(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){//当窗体的宽度小于1255的时候执行相应的操作}else{//当窗体的宽度大于1255的时候执行相应的操作}}if(window.addEventListener){window.addEventListener('resize', function(){ fn(); });}else if(window.attachEvent){window.attachEvent('onresize', function(){ fn(); });}fn();
})();

92、原生JavaScript用正则清除空格分左右

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

93、原生JavaScript判断变量是否空值

/*** 判断变量是否空值* undefined, null, '', false, 0, [], {} 均返回true，否则返回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;
}

94、原生JavaScript实现base64解码

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;
}

95、原生JavaScript实现utf8解码

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('');
}

96、原生JavaScript获取窗体可见范围的宽与高

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);
}

97、原生JavaScript判断IE版本号（既简洁、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 ;
}());

98、原生JavaScript获取浏览器版本号

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;
}

99、原生JavaScript半角转换为全角函数

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;
}

100、原生JavaScript全角转换为半角函数

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;
}