JS Common 2: commonly used functions page 1/3

/*
-------------------------------------------------------------------------------
File Name: check. js
Note: JavaScript scripts are used to check the input data of the webpage submission form.
Version: 1.0
*/
/*
Purpose: Verify the IP address format.
Input: strIP: IP Address
Return: If the verification succeeds, true is returned; otherwise, false is returned;
*/
Function isIP (strIP ){
If (isNull (strIP) return false;
Var re =/^ (\ d + )\. (\ d + )\. (\ d + )\. (\ d +) $/g // Regular Expression matching IP addresses
If (re. test (strIP ))
{
If (RegExp. $1 <256 & RegExp. $2 <256 & RegExp. $3 <256 & RegExp. $4 <256) return true;
}
Return false;
}
/*
Purpose: Check whether the input string is null or all are spaces.
Input: str
Return Value:
If all values are null, true is returned. Otherwise, false is returned.
*/
Function isNull (str ){
If (str = "") return true;
Var regu = "^ [] + $ ";
Var re = new RegExp (regu );
Return re. test (str );
}
/*
Purpose: Check whether the value of the input object conforms to the integer format.
Input: str string
Return: If the verification succeeds, true is returned; otherwise, false is returned.
*/
Function isInteger (str ){
Var regu =/^ [-] {0, 1} [0-9] {1,} $ /;
Return regu. test (str );
}
/*
Purpose: Check whether the entered mobile phone number is correct.
Input:
S: String
Return Value:
If the verification succeeds, true is returned. Otherwise, false is returned.
*/
Function checkMobile (s ){
Var regu =/^ [1] [3] [0-9] {9} $ /;
Var re = new RegExp (regu );
If (re. test (s )){
Return true;
} Else {
Return false;
}
}
/*
Purpose: Check whether the input string conforms to the positive integer format.
Input:
S: String
Return Value:
If the verification succeeds, true is returned. Otherwise, false is returned.
*/
Function isNumber (s ){
Var regu = "^ [0-9] + $ ";
Var re = new RegExp (regu );
If (s. search (re )! =-1 ){
Return true;
} Else {
Return false;
}
}
/*
Purpose: Check whether the input string is in decimal number format. It can be a negative number.
Input:
S: String
Return Value:
If the verification succeeds, true is returned. Otherwise, false is returned.
*/
Function isDecimal (str ){
If (isInteger (str) return true;
Var re =/^ [-] {0, 1} (\ d +) [\.] + (\ d +) $ /;
If (re. test (str )){
If (RegExp. $1 = 0 & RegExp. $2 = 0) return false;
Return true;
} Else {
Return false;
}
}
/*
Purpose: Check whether the value of the input object conforms to the port number format.
Input: str string
Return: If the verification succeeds, true is returned; otherwise, false is returned.
*/
Function isPort (str ){
Return (isNumber (str) & str <65536 );
}
/*
Purpose: Check whether the value of the input object complies with the E-Mail format.
Input: str string
Return: If the verification succeeds, true is returned; otherwise, false is returned.
*/
Function isEmail (str ){
Var myReg =/^ [-_ A-Za-z0-9] + @ ([_ A-Za-z0-9] + \.) + [A-Za-z0-9] {2, 3} $ /;
If (myReg. test (str) return true;
Return false;
}
/*
Purpose: Check whether the input string meets the amount format
The format is defined as a positive number with decimal places. A maximum of three decimal places can be entered.
Input:
S: String
Return Value:
If the verification succeeds, true is returned. Otherwise, false is returned.
*/
Function isMoney (s ){
Var regu = "^ [0-9] + [\.] [0-9] {0, 3} $ ";
Var re = new RegExp (regu );
If (re. test (s )){
Return true;
} Else {
Return false;
}
}
/*
Purpose: Check whether the input string is composed of English letters, numbers, and underscores (_).
Input:
S: String
Return Value:
If the verification succeeds, true is returned. Otherwise, false is returned.
*/
Function isNumberOr_Letter (s) {// determines whether it is a number or letter
Var regu = "^ [0-9a-zA-Z \ _] + $ ";
Var re = new RegExp (regu );
If (re. test (s )){
Return true;
} Else {
Return false;
}
}
/*
Purpose: Check whether the input string consists of only English letters and numbers.
Input:
S: String
Return Value:
If the verification succeeds, true is returned. Otherwise, false is returned.
*/
Function isNumberOrLetter (s) {// determines whether it is a number or letter
Var regu = "^ [0-9a-zA-Z] + $ ";
Var re = new RegExp (regu );
If (re. test (s )){
Return true;
} Else {
Return false;
}
}
/*
Purpose: Check whether the input string consists of only Chinese characters, letters, and numbers.
Input:
Value: String
Return Value:
If the verification succeeds, true is returned. Otherwise, false is returned.
*/
Function isChinaOrNumbOrLett (s) {// determines whether it is composed of Chinese characters, letters, and numbers.
Var regu = "^ [0-9a-zA-Z \ u4e00-\ u9fa5] + $ ";
Var re = new RegExp (regu );
If (re. test (s )){
Return true;
} Else {
Return false;
}
}
/*
Purpose: determine whether it is a date.
Input: date; fmt: date Format
Return: If the verification succeeds, true is returned; otherwise, false is returned.
*/
Function isDate (date, fmt ){
If (fmt = null) fmt = "yyyyMMdd ";
Var yIndex = fmt. indexOf ("yyyy ");
If (yIndex =-1) return false;
Var year = date. substring (yIndex, yIndex + 4 );
Var mIndex = fmt. indexOf ("MM ");
If (mIndex =-1) return false;
Var month = date. substring (mIndex, mIndex + 2 );
Var dIndex = fmt. indexOf ("dd ");
If (dIndex =-1) return false;
Var day = date. substring (dIndex, dIndex + 2 );
If (! IsNumber (year) | year> "2100" | year <"1900") return false;
If (! IsNumber (month) | month> "12" | month <"01") return false;
If (day> getMaxDay (year, month) | day <"01") return false;
Return true;
}
Function getMaxDay (year, month ){
If (month = 4 | month = 6 | month = 9 | month = 11)
Return "30 ";
If (month = 2)
If (year % 4 = 0 & amp; year % 100! = 0 | year % 400 = 0)
Return "29 ";
Else
Return "28 ";
Return "31 ";
}
/*
Purpose: whether character 1 ends with string 2
Input: str1: string; str2: contained string
Return: If the verification succeeds, true is returned; otherwise, false is returned.
*/
Function isLastMatch (str1, str2)
{
Var index = str1.lastIndexOf (str2 );
If (str1.length = index + str2.length) return true;
Return false;
}
/*
Purpose: whether character 1 starts with string 2
Input: str1: string; str2: contained string
Return: If the verification succeeds, true is returned; otherwise, false is returned.
*/
Function isFirstMatch (str1, str2)
{
Var index = str1.indexOf (str2 );
If (index = 0) return true;
Return false;
}