JavaScript正則表達(dá)式校驗(yàn)與遞歸函數(shù)實(shí)際應(yīng)用實(shí)例解析
更新時(shí)間：2017年08月04日 08:26:46 作者：WORSHIP亞薩
這篇文章主要介紹了JavaScript正則表達(dá)式校驗(yàn)與遞歸函數(shù)實(shí)際應(yīng)用,需要的朋友可以參考下
JS遞歸函數(shù)（菲波那切數(shù)列）
實(shí)例解析：
一組數(shù)字:0 1 1 2 3 5 8 13
0 1 2 3 4 5 6 7
sl(0)=0;
sl(1)=1;
sl(2)=sl(0)+sl(1);
sl(3)=sl(1)+sl(2);
function sl(i){
if(i==0){
return 0;
}else if(i==1){
return 1;
}else{
return sl(i-1)+sl(i-2);
}
}
正則表達(dá)式檢驗(yàn)
//校驗(yàn)是否全由數(shù)字組成
function isDigit(s)
{
var patrn=/^[0-9]{1,20}$/;
if (!patrn.exec(s)) return false
return true
}
//校驗(yàn)登錄名：只能輸入5-20個(gè)以字母開(kāi)頭、可帶數(shù)字、“_”、“.”的字串
function isRegisterUserName(s)
{
var patrn=/^[a-zA-Z]{1}([a-zA-Z0-9]|[._]){4,19}$/;
if (!patrn.exec(s)) return false
return true
}
//校驗(yàn)用戶姓名：只能輸入1-30個(gè)以字母開(kāi)頭的字串
function isTrueName(s)
{
var patrn=/^[a-zA-Z]{1,30}$/;
if (!patrn.exec(s)) return false
return true
}
//校驗(yàn)密碼：只能輸入6-20個(gè)字母、數(shù)字、下劃線
function isPasswd(s)
{
var patrn=/^(\w){6,20}$/;
if (!patrn.exec(s)) return false
return true
}
//校驗(yàn)普通電話、傳真號(hào)碼：可以“+”開(kāi)頭，除數(shù)字外，可含有“-”
function isTel(s)
{
//var patrn=/^[+]{0,1}(\d){1,3}[ ]?([-]?(\d){1,12})+$/;
var patrn=/^[+]{0,1}(\d){1,3}[ ]?([-]?((\d)|[ ]){1,12})+$/;
if (!patrn.exec(s)) return false
return true
}
//校驗(yàn)手機(jī)號(hào)碼：必須以數(shù)字開(kāi)頭，除數(shù)字外，可含有“-”
function isMobil(s)
{
var patrn=/^[+]{0,1}(\d){1,3}[ ]?([-]?((\d)|[ ]){1,12})+$/;
if (!patrn.exec(s)) return false
return true
}
//校驗(yàn)郵政編碼
function isPostalCode(s)
{
//var patrn=/^[a-zA-Z0-9]{3,12}$/;
var patrn=/^[a-zA-Z0-9 ]{3,12}$/;
if (!patrn.exec(s)) return false
return true
}
//校驗(yàn)搜索關(guān)鍵字
function isSearch(s)
{
var patrn=/^[^`~!@#$%^&*()+=|\\\][\]\{\}:;\'\,.<>/?]{1}[^`~!@$%^&()+=|\\\][\]\{\}:;\'\,.<>?]{0,19}$/;
if (!patrn.exec(s)) return false
return true
}
function isIP(s) //by zergling
{
var patrn=/^[0-9.]{1,20}$/;
if (!patrn.exec(s)) return false
return true
}
* FUNCTION: isBetween
* PARAMETERS: val AS any value
* lo AS Lower limit to check
* hi AS Higher limit to check
* CALLS: NOTHING
* RETURNS: TRUE if val is between lo and hi both inclusive, otherwise false.
function isBetween (val, lo, hi) {
if ((val < lo) || (val > hi)) { return(false); }
else { return(true); }
}
* FUNCTION: isDate checks a valid date
* PARAMETERS: theStr AS String
* CALLS: isBetween, isInt
* RETURNS: TRUE if theStr is a valid date otherwise false.
function isDate (theStr) {
var the1st = theStr.indexOf('-');
var the2nd = theStr.lastIndexOf('-');
if (the1st == the2nd) { return(false); }
else {
var y = theStr.substring(0,the1st);
var m = theStr.substring(the1st+1,the2nd);
var d = theStr.substring(the2nd+1,theStr.length);
var maxDays = 31;
if (isInt(m)==false || isInt(d)==false || isInt(y)==false) {
return(false); }
else if (y.length < 4) { return(false); }
else if (!isBetween (m, 1, 12)) { return(false); }
else if (m==4 || m==6 || m==9 || m==11) maxDays = 30;
else if (m==2) {
if (y % 4 > 0) maxDays = 28;
else if (y % 100 == 0 && y % 400 > 0) maxDays = 28;
else maxDays = 29;
}
if (isBetween(d, 1, maxDays) == false) { return(false); }
else { return(true); }
}
}
* FUNCTION: isEuDate checks a valid date in British format
* PARAMETERS: theStr AS String
* CALLS: isBetween, isInt
* RETURNS: TRUE if theStr is a valid date otherwise false.
function isEuDate (theStr) {
if (isBetween(theStr.length, 8, 10) == false) { return(false); }
else {
var the1st = theStr.indexOf('/');
var the2nd = theStr.lastIndexOf('/');
if (the1st == the2nd) { return(false); }
else {
var m = theStr.substring(the1st+1,the2nd);
var d = theStr.substring(0,the1st);
var y = theStr.substring(the2nd+1,theStr.length);
var maxDays = 31;
if (isInt(m)==false || isInt(d)==false || isInt(y)==false) {
return(false); }
else if (y.length < 4) { return(false); }
else if (isBetween (m, 1, 12) == false) { return(false); }
else if (m==4 || m==6 || m==9 || m==11) maxDays = 30;
else if (m==2) {
if (y % 4 > 0) maxDays = 28;
else if (y % 100 == 0 && y % 400 > 0) maxDays = 28;
else maxDays = 29;
}
if (isBetween(d, 1, maxDays) == false) { return(false); }
else { return(true); }
}
}
}
* FUNCTION: Compare Date! Which is the latest!
* PARAMETERS: lessDate,moreDate AS String
* CALLS: isDate,isBetween
* RETURNS: TRUE if lessDate<moreDate
function isComdate (lessDate , moreDate)
{
if (!isDate(lessDate)) { return(false);}
if (!isDate(moreDate)) { return(false);}
var less1st = lessDate.indexOf('-');
var less2nd = lessDate.lastIndexOf('-');
var more1st = moreDate.indexOf('-');
var more2nd = moreDate.lastIndexOf('-');
var lessy = lessDate.substring(0,less1st);
var lessm = lessDate.substring(less1st+1,less2nd);
var lessd = lessDate.substring(less2nd+1,lessDate.length);
var morey = moreDate.substring(0,more1st);
var morem = moreDate.substring(more1st+1,more2nd);
var mored = moreDate.substring(more2nd+1,moreDate.length);
var Date1 = new Date(lessy,lessm,lessd);
var Date2 = new Date(morey,morem,mored);
if (Date1>Date2) { return(false);}
return(true);
}
* FUNCTION isEmpty checks if the parameter is empty or null
* PARAMETER str AS String
function isEmpty (str) {
if ((str==null)||(str.length==0)) return true;
else return(false);
}
* FUNCTION: isInt
* PARAMETER: theStr AS String
* RETURNS: TRUE if the passed parameter is an integer, otherwise FALSE
* CALLS: isDigit
function isInt (theStr) {
var flag = true;
if (isEmpty(theStr)) { flag=false; }
else
{ for (var i=0; i<theStr.length; i++) {
if (isDigit(theStr.substring(i,i+1)) == false) {
flag = false; break;
}
}
}
return(flag);
}
* FUNCTION: isReal
* PARAMETER: heStr AS String
decLen AS Integer (how many digits after period)
* RETURNS: TRUE if theStr is a float, otherwise FALSE
* CALLS: isInt
function isReal (theStr, decLen) {
var dot1st = theStr.indexOf('.');
var dot2nd = theStr.lastIndexOf('.');
var OK = true;
if (isEmpty(theStr)) return false;
if (dot1st == -1) {
if (!isInt(theStr)) return(false);
else return(true);
}
else if (dot1st != dot2nd) return (false);
else if (dot1st==0) return (false);
else {
var intPart = theStr.substring(0, dot1st);
var decPart = theStr.substring(dot2nd+1);
if (decPart.length > decLen) return(false);
else if (!isInt(intPart) || !isInt(decPart)) return (false);
else if (isEmpty(decPart)) return (false);
else return(true);
}
}
* FUNCTION: isEmail
* PARAMETER: String (Email Address)
* RETURNS: TRUE if the String is a valid Email address
* FALSE if the passed string is not a valid Email Address
* EMAIL FORMAT: AnyName@EmailServer e.g; webmaster@hotmail.com
* @ sign can appear only once in the email address.
function isEmail (theStr) {
var atIndex = theStr.indexOf('@');
var dotIndex = theStr.indexOf('.', atIndex);
var flag = true;
theSub = theStr.substring(0, dotIndex+1)
if ((atIndex < 1)||(atIndex != theStr.lastIndexOf('@'))||(dotIndex < atIndex + 2)||(theStr.length <= theSub.length))
{ return(false); }
else { return(true); }
}
* FUNCTION: newWindow
* PARAMETERS: doc -> Document to open in the new window
hite -> Height of the new window
wide -> Width of the new window
bars -> 1-Scroll bars = YES 0-Scroll Bars = NO
resize -> 1-Resizable = YES 0-Resizable = NO
* CALLS: NONE
* RETURNS: New window instance
function newWindow (doc, hite, wide, bars, resize) {
var winNew="_blank";
var opt="toolbar=0,location=0,directories=0,status=0,menubar=0,";
opt+=("scrollbars="+bars+",");
opt+=("resizable="+resize+",");
opt+=("width="+wide+",");
opt+=("height="+hite);
winHandle=window.open(doc,winNew,opt);
return;
}
* FUNCTION: DecimalFormat
* PARAMETERS: paramValue -> Field value
* CALLS: NONE
* RETURNS: Formated string
function DecimalFormat (paramValue) {
var intPart = parseInt(paramValue);
var decPart =parseFloat(paramValue) - intPart;
str = "";
if ((decPart == 0) || (decPart == null)) str += (intPart + ".00");
else str += (intPart + decPart);
return (str);
}
正則表達(dá)式應(yīng)用
"^\\d+$" //非負(fù)整數(shù)（正整數(shù) + 0） "^[0-9]*[1-9][0-9]*$" //正整數(shù) "^((-\\d+)|(0+))$" //非正整數(shù)（負(fù)整數(shù) + 0） "^-[0-9]*[1-9][0-9]*$" //負(fù)整數(shù) "^-?\\d+$" //整數(shù) "^\\d+(\\.\\d+)?$" //非負(fù)浮點(diǎn)數(shù)（正浮點(diǎn)數(shù) + 0） "^(([0-9]+\\.[0-9]*[1-9][0-9]*)|([0-9]*[1-9][0-9]*\\.[0-9]+)|([0-9]*[1-9][0-9]*))$" //正浮點(diǎn)數(shù) "^((-\\d+(\\.\\d+)?)|(0+(\\.0+)?))$" //非正浮點(diǎn)數(shù)（負(fù)浮點(diǎn)數(shù) + 0） "^(-(([0-9]+\\.[0-9]*[1-9][0-9]*)|([0-9]*[1-9][0-9]*\\.[0-9]+)|([0-9]*[1-9][0-9]*)))$" //負(fù)浮點(diǎn)數(shù) "^(-?\\d+)(\\.\\d+)?$" //浮點(diǎn)數(shù) "^[A-Za-z]+$" //由26個(gè)英文字母組成的字符串 "^[A-Z]+$" //由26個(gè)英文字母的大寫(xiě)組成的字符串 "^[a-z]+$" //由26個(gè)英文字母的小寫(xiě)組成的字符串 "^[A-Za-z0-9]+$" //由數(shù)字和26個(gè)英文字母組成的字符串 "^\\w+$" //由數(shù)字、26個(gè)英文字母或者下劃線組成的字符串 "^[\\w-]+(\\.[\\w-]+)*@[\\w-]+(\\.[\\w-]+)+$" //email地址 "^[a-zA-z]+://(\\w+(-\\w+)*)(\\.(\\w+(-\\w+)*))*(\\?\\S*)?$" //url
遞歸函數(shù)應(yīng)用
總結(jié)
以上所述是小編給大家介紹的JavaScript正則表達(dá)式校驗(yàn)與遞歸函數(shù)實(shí)際應(yīng)用實(shí)例解析，希望對(duì)大家有所幫助，如果大家有任何疑問(wèn)請(qǐng)給我留言，小編會(huì)及時(shí)回復(fù)大家的。在此也非常感謝大家對(duì)腳本之家網(wǎng)站的支持！
相關(guān)文章
javascript強(qiáng)制彈出新窗口實(shí)現(xiàn)代碼
javascript強(qiáng)制彈出新窗口，主要是利用的動(dòng)態(tài)創(chuàng)建鏈接。2009-12-12
這篇文章主要介紹了JavaScript框架(iframe)操作,介紹了種情況下的操作方法,需要的朋友可以參考下2014-04-04
解決layui中的form表單與button的點(diǎn)擊事件沖突問(wèn)題
今天小編就為大家分享一篇解決layui中的form表單與button的點(diǎn)擊事件沖突問(wèn)題，具有很好的參考價(jià)值，希望對(duì)大家有所幫助。一起跟隨小編過(guò)來(lái)看看吧2018-08-08
這篇文章主要介紹了微信小程序如何使用globalData的方法，文中通過(guò)示例代碼介紹的非常詳細(xì)，對(duì)大家的學(xué)習(xí)或者工作具有一定的參考學(xué)習(xí)價(jià)值，需要的朋友們下面隨著小編來(lái)一起學(xué)習(xí)學(xué)習(xí)吧2019-06-06
簡(jiǎn)單JS代碼壓縮器...2006-10-10
JavaScript中forEach和map詳細(xì)講解
foreach和map都是JavaScript中數(shù)組的常用方法,它們都可以對(duì)數(shù)組中的每個(gè)元素執(zhí)行一個(gè)函數(shù),但是它們有一些區(qū)別,下面這篇文章主要給大家介紹了關(guān)于JavaScript中forEach和map詳細(xì)講解的相關(guān)資料,需要的朋友可以參考下2023-11-11
B/S模式項(xiàng)目中常用的javascript匯總
本篇文章是對(duì)B/S模式項(xiàng)目中常用的javascript進(jìn)行了匯總介紹，需要的朋友可以過(guò)來(lái)參考下，希望對(duì)大家有所幫助2013-12-12
全面解析Bootstrap中scrollspy（滾動(dòng)監(jiān)聽(tīng)）的使用方法
這篇文章主要為大家全面解析Bootstrap中scrollspy（滾動(dòng)偵聽(tīng)）的使用方法，感興趣的小伙伴們可以參考一下2016-06-06
微信小程序?qū)崿F(xiàn)簡(jiǎn)單跑馬燈效果
這篇文章主要為大家詳細(xì)介紹了微信小程序?qū)崿F(xiàn)簡(jiǎn)單跑馬燈效果 ，文中示例代碼介紹的非常詳細(xì)，具有一定的參考價(jià)值，感興趣的小伙伴們可以參考一下2018-12-12
搞數(shù)據(jù)展示,很多朋友都會(huì)用到免費(fèi)的echarts,下面這篇文章主要給大家介紹了關(guān)于echarts控制x軸和y軸name位置并加軸箭頭的相關(guān)資料,需要的朋友可以參考下2024-01-01