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

/****************************************************************//* Name: datalength//* function: Calculate the length of the data//* entry parameters: FData: Need Calculated data//* exit Parameters: Returns the length of the Fdata (Unicode length is 2, non-Unicode length is 1)//*********************************************************** function Datalength (fdata) {var intlength=0 for (Var i=0;i<fdata.length;i++) {if (Fdata.charcodeat ( 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: Empty//* False: Non-empty//***************************************************************** function IsEmpty (fdata) {return (FD Ata==null) | |
(fdata.length==0)) //****************************************************************//* Name: isdigit//* function: To determine whether the number//* entry parameters: FData: To Checked data//* exit parameters: True: 0 to 9 digits//* False: not 0 to 9 digits/function IsDigit (fdata) {return (fdata>= "0") && (fdata<= "9")}//****************************************************************//* Name: IsInteger// * Function: To determine whether a positive integer//* entry parameter: Fdata: The data to be checked//* exit parameter: True: is an integer, or the data is empty//* False: not an integer//********************** function Isinteger (fdata) {//If NULL, returns True if (IsEmpty (fdata)) return T Rue if (isNaN (fdata)) | | (Fdata.indexof (".")! =-1) | |
    (Fdata.indexof ("-")!=-1)
return false to return true}//****************************************************************//* name: Isemail * Function: To determine whether the correct email address//* entry parameters: Fdata: Data to be checked//* exit parameter: 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 is False if (NAMELIST[0].LENGTH&LT;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 to 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 return true}//****************************************************************//* name: Isplusnumeric/ /* Function: Determine if the correct positive number (can contain a decimal part)//* entry parameter: Fdata: The data to be checked//* exit parameter: true: Correct positive number, or null//* false: Wrong positive number//* 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)) re Turn True if (isNaN (Fdata)) return False to return true}//*********************************************** * Name: Isintegerinrange//* function: To determine whether a number in the specified range//* entry parameters:Finput: To check the data//* fLower: Check the lower bounds, if there is no lower limit, please use null//* fhigh: Check the upper limit, if there is no limit, please use null//* exit parameter: True: within the specified range * False: Outside the specified range//***************************************************************** function Isintegerinrange (fIn Put,flower,fhigh) {if (flower==null) return (Finput<=fhigh) else if (fhigh==null) return (Finput>=flowe R) Else return ((finput>=flower) && (Finput<=fhigh))}