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_:\@&?=+,.!\/~%\$]*)?)$/i
if (regular.test(strUrl)) {
return true;
}else {
return false;
}
}
37、去掉url前缀
function removeUrlPrefix(a){
a=a.replace(/：/g,":").replace(/．/g,".").replace(/／/g,"/");
while(trim(a).toLowerCase().indexOf("http://")==0){
a=trim(a.replace(/http:\/\//i,""));
}
return a;
}
38、随机数时间戳
function uniqueId(){
var a=Math.random,b=parseInt;
return Number(new Date()).toString()+b(10*a())+b(10*a())+b(10*a());
}
39、时间个性化输出功能
1 /*
2 1、< 60s, 显示为“刚刚”
3 2、>= 1min && < 60 min, 显示与当前时间差“XX分钟前”
4 3、>= 60min && < 1day, 显示与当前时间差“今天 XX:XX”
5 4、>= 1day && < 1year, 显示日期“XX月XX日 XX:XX”
6 5、>= 1year, 显示具体日期“XXXX年XX月XX日 XX:XX”
7 */
8 function timeFormat(time){
9 var date = new Date(time),
10 curDate = new Date(),
11 year = date.getFullYear(),
12 month = date.getMonth() + 10,
13 day = date.getDate(),
14 hour = date.getHours(),
15 minute = date.getMinutes(),
16 curYear = curDate.getFullYear(),
17 curHour = curDate.getHours(),
18 timeStr;
19
20 if(year < curYear){
21 timeStr = year +'年'+ month +'月'+ day +'日 '+ hour +':'+ minute;
22 }else{
23 var pastTime = curDate - date,
24 pastH = pastTime/3600000;
25
26 if(pastH > curHour){
27 timeStr = month +'月'+ day +'日 '+ hour +':'+ minute;
28 }else if(pastH >= 1){
29 timeStr = '今天 ' + hour +':'+ minute +'分';
30 }else{
31 var pastM = curDate.getMinutes() - minute;
32 if(pastM > 1){
33 timeStr = pastM +'分钟前';
34 }else{
35 timeStr = '刚刚';
36 }
37 }
38 }
39 return timeStr;
40 }
40、常用的正则表达式
1 //正整数
2 /^[0-9]*[1-9][0-9]*$/;
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 或：^http:\/\/[A-Za-z0-9]+\.[A-Za-z0-9]+[\/=\?%\-&_~`@[\]\':+!]*([^<>\"\"])*$
16 //年/月/日（年-月-日、年.月.日）
17 /^(19|20)\d\d[- /.](0[1-9]|1[012])[- /.](0[1-9]|[12][0-9]|3[01])$/;
18 //匹配中文字符
19 /[\u4e00-\u9fa5]/;
20 //匹配帐号是否合法(字母开头，允许5-10字节，允许字母数字下划线)
21 /^[a-zA-Z][a-zA-Z0-9_]{4,9}$/;
22 //匹配空白行的正则表达式
23 /\n\s*\r/;
24 //匹配中国邮政编码
25 /[1-9]\d{5}(?!\d)/;
26 //匹配身份证
27 /\d{15}|\d{18}/;
28 //匹配国内电话号码
29 /(\d{3}-|\d{4}-)?(\d{8}|\d{7})?/;
30 //匹配IP地址
31 /((2[0-4]\d|25[0-5]|[01]?\d\d?)\.){3}(2[0-4]\d|25[0-5]|[01]?\d\d?)/;
32 //匹配首尾空白字符的正则表达式
33 /^\s*|\s*$/;
34 //匹配HTML标记的正则表达式
35 < (\S*?)[^>]*>.*?|< .*? />;
36 //sql 语句
37 ^(select|drop|delete|create|update|insert).*$
38 //提取信息中的网络链接
39 (h|H)(r|R)(e|E)(f|F) *= *('|")?(\w|\\|\/|\.)+('|"| *|>)?
40 //提取信息中的邮件地址
41 \w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*
42 //提取信息中的图片链接
43 (s|S)(r|R)(c|C) *= *('|")?(\w|\\|\/|\.)+('|"| *|>)?
44 //提取信息中的 IP 地址
45 (\d+)\.(\d+)\.(\d+)\.(\d+)
46 //取信息中的中国手机号码
47 (86)*0*13\d{9}
48 //提取信息中的中国邮政编码
49 [1-9]{1}(\d+){5}
50 //提取信息中的浮点数（即小数）
51 (-?\d*)\.?\d+
52 //提取信息中的任何数字
53 (-?\d*)(\.\d+)?
54 //电话区号
55 ^0\d{2,3}$
56 //腾讯 QQ 号
57 ^[1-9]*[1-9][0-9]*$
58 //帐号（字母开头，允许 5-16 字节，允许字母数字下划线）
59 ^[a-zA-Z][a-zA-Z0-9_]{4,15}$
60 //中文、英文、数字及下划线
61 ^[\u4e00-\u9fa5_a-zA-Z0-9]+$
41、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 }, 10);
15 };
16 function set() {
17 btn.style.display = (d.scrollTop + b.scrollTop > 100) ? 'block': "none"
18 }
19 };
20 backTop('goTop');
42、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 = [];
7 for(i=0;i<GETs.length;i++){
8 tmp_arr = GETs.split("=")
9 key=tmp_arr[0]
10 GET[key] = tmp_arr[1]
11 }
12 }
13 return querystr[1];
14 }
43、清除相同的数组
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.replace(/([^\w])/ig,"\\$1")+"$","igm").test(y)){
6 y+=x+"\r\n"
7 }
8 }
9 return y
10 };
44、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=K1.value!=text?text:test;
5 }
45、字符串反序
function IsReverse(text){
return text.split('').reverse().join('');
}
46、清除html代码中的脚本
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 }
4 动态执行JavaScript脚本
5
6 function javascript(){
7 try{
8 eval(K1.value);
9 }catch(e){
10 alert(e.message);
11 }
12 }
47、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 k2++;
46 }
47 }
48 //转换小数部分
49 var strdig = "";
50 if (dig != "") {
51 var n = dig.charAt(0);
52 if (n != 0) {
53 strdig += dw[Number(n)] + "角"; //加数字
54 }
55 var n = dig.charAt(1);
56 if (n != 0) {
57 strdig += dw[Number(n)] + "分"; //加数字
58 }
59 }
60 str += "元" + strdig;
61 } catch(e) {
62 return "0元";
63 }
64 return str;
65 }
66 //拆分整数与小数
67 function splits(tranvalue) {
68 var value = new Array('', '');
69 temp = tranvalue.split(".");
70 for (var i = 0; i < temp.length; i++) {
71 value = temp;
72 }
73 return value;
74 }
48、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 }
49、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 }
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;
}
