四月 20th, 2015 by lanxinxichen@126.com

收集了一些比较常用的javascript函数。

1、字符串长度截取

function cutstr(str, len) {

var temp,

icount = 0,

patrn = /[^\x00-\xff]/,

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、替换全部

String.prototype.replaceAll = function(s1, s2) {

return this.replace(new RegExp(s1, “gm”), s2)

}

3、清除空格

String.prototype.trim = function() {

var reExtraSpace = /^\s*(.*?)\s+$/;

return this.replace(reExtraSpace, “$1″)

}

4、清除左空格/右空格

function ltrim(s){ return s.replace( /^(\s*| *)/, “”); }

function rtrim(s){ return s.replace( /(\s*| *)$/, “”); }

5、判断是否以某个字符串开头

String.prototype.startWith = function (s) {

return this.indexOf(s) == 0

}

6、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)

}

7、转义html标签

function HtmlEncode(text) {

return text.replace(/&/g, ‘&’).replace(/\”/g, ‘”‘).replace(/</g, ‘<‘).replace(/>/g, ‘>’)

}

8、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

}

9、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

}

}

10、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;”

}

11、获取cookie值

function getCookie(name) {

var arr = document.cookie.match(new RegExp(“(^| )” + name + “=([^;]*)(;|$)”));

if (arr != null) return unescape(arr[2]);

return null

}

12、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”)

}

}

}

13、设为首页

function setHomepage() {

if (document.all) {

document.body.style.behavior = ‘url(#default#homepage)';

document.body.setHomePage(‘http://w3cboy.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://w3cboy.com’)

}

}

14、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、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、清除脚本内容

function stripscript(s) {

return s.replace(/<script.*?>.*?<\/script>/ig, ”);

}

17、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.onloadDone = false;

scriptNode.onload = function () {

scriptNode.onloadDone = true;

JSLOADED[src] = 1;

};

scriptNode.onreadystatechange = function () {

if((scriptNode.readyState == ‘loaded’ || scriptNode.readyState == ‘complete’) && !scriptNode.onloadDone) {

scriptNode.onloadDone = true;

JSLOADED[src] = 1;

}

};

} else if(text){

scriptNode.text = text;

}

document.getElementsByTagName(‘head’)[0].appendChild(scriptNode);

} catch(e) {}

}

18、返回按ID检索的元素对象

function $(id) {

return !id ? null : document.getElementById(id);

}

19、跨浏览器绑定事件

function addEventSamp(obj,evt,fn){

if(!oTarget){return;}

if (obj.addEventListener) {

obj.addEventListener(evt, fn, false);

}else if(obj.attachEvent){

obj.attachEvent(‘on’+evt,fn);

}else{

oTarget[“on” + sEvtType] = fn;

}

}

20、跨浏览器删除事件

function delEvt(obj,evt,fn){

if(!obj){return;}

if(obj.addEventListener){

obj.addEventListener(evt,fn,false);

}else if(oTarget.attachEvent){

obj.attachEvent(“on” + evt,fn);

}else{

obj[“on” + evt] = fn;

}

}

21、为元素添加on方法

Element.prototype.on = Element.prototype.addEventListener;

NodeList.prototype.on = function (event, fn) {、

[][‘forEach’].call(this, function (el) {

el.on(event, fn);

});

return this;

};

22、为元素添加trigger方法

Element.prototype.trigger = function (type, data) {

var event = document.createEvent(‘HTMLEvents’);

event.initEvent(type, true, true);

event.data = data || {};

event.eventName = type;

event.target = this;

this.dispatchEvent(event);

return this;

};

NodeList.prototype.trigger = function (event) {

[][‘forEach’].call(this, function (el) {

el[‘trigger’](event);

});

return this;

};

23、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);

}

}

}

24、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;

}

25、压缩CSS样式代码

function compressCss (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];

}

26、获取当前路径

var currentPageUrl = “”;

if (typeof this.href === “undefined”) {

currentPageUrl = document.location.toString().toLowerCase();

}else {

currentPageUrl = this.href.toString().toLowerCase();

}

27、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;

}

28、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()));

}

29、判断是否苹果移动设备访问

function isAppleMobileDevice(){

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

}

30、判断是否安卓移动设备访问

function isAndroidMobileDevice(){

return (/android/i.test(navigator.userAgent.toLowerCase()));

}

31、判断是否Touch屏幕

function isTouchScreen(){

return ((‘ontouchstart’ in window) || window.DocumentTouch && document instanceof DocumentTouch);

}

32、判断是否打开视窗

function isViewportOpen() {

return !!document.getElementById(‘wixMobileViewport’);

}

33、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;

}

34、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;

}

}

35、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;

}

36、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_:\@&?=+,.!\/~%\$]*)?)$/i

if (regular.test(strUrl)) {

return true;

}else {

return false;

}

}

37、去掉url前缀

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;

}

38、随机数时间戳

function uniqueId(){

var a=Math.random,b=parseInt;

return Number(new Date()).toString()+b(10*a())+b(10*a())+b(10*a());

}

39、时间个性化输出功能

/*

1、< 60s, 显示为“刚刚”

2、>= 1min && < 60 min, 显示与当前时间差“XX分钟前”

3、>= 60min && < 1day, 显示与当前时间差“今天 XX:XX”

4、>= 1day && < 1year, 显示日期“XX月XX日 XX:XX”

5、>= 1year, 显示具体日期“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() + 10,

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 +’分钟前';

}else{

timeStr = ‘刚刚';

}

}

}

return timeStr;

}

40、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*)?$/;

或:^http:\/\/[A-Za-z0-9]+\.[A-Za-z0-9]+[\/=\?%\-&_~`@[\]\':+!]*([^<>\”\”])*$

//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)/;

//匹配身份证

/\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*?)[^>]*>.*?|< .*? />;

//sql 语句

^(select|drop|delete|create|update|insert).*$

//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+)

//取信息中的中国手机号码

(86)*0*13\d{9}

//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+)?

//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]+$

41、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’);

42、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 = [];

for(i=0;i<GETs.length;i++){

tmp_arr = GETs.split(“=”)

key=tmp_arr[0]

GET[key] = tmp_arr[1]

}

}

return querystr[1];

}

43、清除相同的数组

String.prototype.unique=function(){

var x=this.split(/[\r\n]+/);

var y=”;

for(var i=0;i<x.length;i++){

if(!new RegExp(“^”+x.replace(/([^\w])/ig,”\\$1″)+”$”,”igm”).test(y)){

y+=x+”\r\n”

}

}

return y

};

44、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;

}

45、字符串反序

function IsReverse(text){

return text.split(”).reverse().join(”);

}

46、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,””);

}

动态执行JavaScript脚本

function javascript(){

try{

eval(K1.value);

}catch(e){

alert(e.message);

}

}

47、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 = temp;

}

return value;

}

48、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;

}

49、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(”);

}

50、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);

}

51、判断鼠标是否移出事件

function isMouseOut(e, handler) {

if (e.type !== ‘mouseout’) {

return false;

}

var reltg = e.relatedTarget ? e.relatedTarget : e.type === ‘mouseout’ ? e.toElement : e.fromElement;

while (reltg && reltg !== handler) {

reltg = reltg.parentNode;

}

return (reltg !== handler);

}

52、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;

}

53、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;

}

 

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