JavaScript to judge the character length, number, Email, telephone and other common judgment functions to share

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/****************************************************************//* Name: datalength//* function: Calculate the length of the data//* Entry parameters: Fdata: Data//* export parameters that need to be computed: the length of the return Fdata (Unicode length 2, non-Unicode length 1)//********************************************** function Datalength (fdata) {var intlength=0 for (Var i=0;i<fdata.length;i++) {if (fdata.charcod EAt (i) < 0) | | (Fdata.charcodeat (i) > 255)) Intlength=intlength+2 Else intlength=intlength+1} return intlength}  //*************************************** * Name: IsEmpty//* function: To determine whether null//* entry parameters: Fdata: Data to check//* exit parameter: True: null//* False: Non-empty//*********** function IsEmpty (fdata) {return (fdata==null) | | (fdata.length==0)) }    //****************************************************************//* name: isdigit//* function: To determine whether a digital//* entry Parameters: Fdata: Data//* export parameters to check: True: is 0 to 9 of the number//* False: not 0 to 9 of the number//******************************************************** ******function IsDigit (fdata) {return (fdata>= "0") && (fdata<= "9"))}    //********************* * Name: Isinteger//* function: To determine whether a positive integer//* entry parameter: Fdata: Data to check//* exit parameter: True: is an integer, or The person data is empty//* False: Is not an integer//***************************************************************** function isinteger (fData) {//If NULL, returns True if (IsEmpty (Fdata)) return True if (isNaN (fdata) | | (Fdata.indexof (".")! =-1) | | (Fdata.indexof ("-")!=-1) return false   return true}  //****************************************************************//* name: Isem Ail//* function: To determine whether it is the correct email address//* entry parameters: Fdata: Data to check//* exit parameters: true: Correct email address, or null//* false: Wrong email address//****************** function Isemail (fdata) {if (IsEmpty (Fdata)) return True if ( Fdata.indexof ("@") ==-1) return false var namelist=fdata.split ("@"); if (namelist.length!=2) return of False if (NAMELIST[0].LENGTH<1) return False if (Namelist[1].indExof (".") <=0 return False if (Fdata.indexof ("@") >fdata.indexof (".")) return False if (Fdata.indexof (".") ==FDATA.LENGTH-1) return false   return true}  //********************************************************* * Name: Isphone//* function: To determine whether the correct phone number (can contain "()", "()", "+", "-" and space)//* entry parameters: Fdata: To check the data//* export parameters: true: Correct phone number, or empty//* False: Wrong phone number//* error message://***************************************************************** function Isphone (fData) {var str; var fdatastr= ""; if (IsEmpty (Fdata)) return True for (Var i=0;i<fdata.length;i++) {str=fdata.substring (i,i+ 1); if (str!= "&& str!=") "&& str!=" ("&& str!=") "&& str!=" + "&& str!="-"&&amp ; Str!= "") fdatastr=fdatastr+str;} alert (FDATASTR); if (isNaN (FDATASTR)) return False to return true}  //************************************************************* * Name: Isplusnumeric//* function: Determine if the correct positive number (can contain a decimal part)//* entry parameters: Fdata: Data to check//* exit parameter: true: Correct positive number, or null//* False: Error positive//* error message://***************************************************************** function Isplusnumeric (fData) { if (IsEmpty (Fdata)) return True if (isNaN (fdata) | | (Fdata.indexof ("-")!=-1) return false to return true}  //****************************************************************//* name: IsNumeric/ /* Function: Determine if the correct number (can be negative, decimal)//* entry parameters: Fdata: The data to be checked//* exit parameter: true: correct number, or null//* false: Wrong number//* error message://******************* function IsNumeric (fdata) {if (IsEmpty (Fdata)) return True if (isNaN ( Fdata)) return false   return true}    //************************************************************* * Name: Isintegerinrange//* function: To determine whether a number is within the specified range//* entry parameters: Finput: The data to be checked//* fLower: Check the lower bounds, if there is no lower limit, please use null//* fhigh: Check The upper limit, if there is no upper limit, please use null//* exit parameter: True://* False in the specified range: Outside the specified range//******************************************************** function Isintegerinrange (Finput,flower,fhigh) {if (flower==null) return (fInPut<=fhigh) Else if (fhigh==null) return (finput>=flower) Else return ((finput>=flower) && (finput<= FHigh))}