JS evaluate password strength

Http://www.phpchina.com/14112/viewspace_28701.html
JS implementation to evaluate the password strength
<SCRIPT type = " Text/JavaScript " >
// Charmode Function
// Test the type of a character.
Function Charmode (in) {
If (In > = 48   && In <= 57 ) // Number
Return   1 ;
If (In > = 65   && In <= 90 ) // Uppercase letters
Return   2 ;
If (In > = 97   && In <= 122 ) // Lowercase
Return   4 ;
Else  
Return   8 ; // Special characters
}  

// Bittotal Function
// Calculate the total number of modes in the current password.
Function Bittotal (Num) {
Modes = 0 ;
For (I = 0 ; I < 4 ; I ++ ) {
If(Num& 1) Modes++;
Num>>>=1;
}  
Return Modes;
}  

// Checkstrong Function
// Returns the password strength level.

Function Checkstrong (spw) {
If (Spw. Length <= 4 )
Return   0 ; // The password is too short.
Modes = 0 ;
For (I = 0 ; I < Spw. length; I ++ ) {
//Test the category of each character and calculate the total number of modes.
Modes| =Charmode (spw. charcodeat (I ));
}  

ReturnBittotal (modes );

} 

// Pwstrength Function
// When the user releases the keyboard or loses the focus in the password input box, different colors are displayed based on different levels.

Function Pwstrength (PWD) {
O_color = " # Eeeeee " ;
Rochelle color = " # Ff0000 " ;
M_color = " # Ff9900 " ;
H_color = " #33cc00 " ;
If (PWD = Null | PWD = '') {
Lcolor=Mcolor=Hcolor=O_color;
}  
Else {
S_level = Checkstrong (PWD );
Switch (S_level) {
Case   0 :
Lcolor = Mcolor = Hcolor = O_color;
Case   1 :
Lcolor = Rochelle color;
Mcolor = Hcolor = O_color;
Break ;
Case   2 :
Lcolor = Mcolor = M_color;
Hcolor = O_color;
Break ;
Default :
Lcolor = Mcolor = Hcolor = H_color;
}  
}  

Document. getelementbyid ( " Strength_l " ). Style. Background = Lcolor;
Document. getelementbyid ( " Strength_m " ). Style. Background = Mcolor;
Document. getelementbyid ( " Strength_h " ). Style. Background = Hcolor;
Return ;
}
  </ SCR limit PT >

< Form Name = Form1 Action = ""   >  
Enter the password: < Input Type = Password Size = 10 Onkeyup = Pwstrength (this. value) Onblur = Pwstrength (this. value) >  
< BR > Password strength:
< Table Width = "217" Border = "1" Cellspacing = "0" Cellpadding = "1" Bordercolor = "# Cccccc" Height = "23" Style = 'Display: inline' >  
< Tr Align = "Center" Bgcolor = "# Eeeeee" >  
< TD Width = "33%" ID = "Strength_l" > Weak </ TD >  
< TD Width = "33%" ID = "Strength_m" > Medium </ TD >  
< TD Width = "33%" ID = "Strength_h" > Strong </ TD >  
</ Tr >  
</ Table >  
</ Form >

  JS class for checking the password strength
Http://www.cnblogs.com/thinhunan/archive/2006/05/14/399656.html
<SCRIPT type = "text/JavaScript">
VaR passwordstrength = {
Level: ["high, it is really high", "okay", "rely on, this is OK"],
Levelvalue: [30, 20, 0], // intensity value
Factor: [1, 2, 5], // character addition, which are letters, numbers, and others
Kindfactor: [0, 0, 10, 20], // The password consists of several numbers.
RegEx: [/[A-Za-Z]/g, // \ D/g,/[^ a-zA-Z0-9]/g] // character regular number regular other regular
}
Passwordstrength. strengthvalue = function (PWD)
{
VaR strengthvalue = 0;
VaR composedkind = 0;
For (VAR I = 0; I <this. RegEx. length; I ++)
{
VaR chars = PWD. Match (this. RegEx [I]);
If (chars! = NULL)
{
Strengthvalue + = chars. length * This. factor [I];
Composedkind ++;
}
}
Strengthvalue + = This. kindfactor [composedkind];
Return strengthvalue;
}
Passwordstrength. strengthlevel = function (PWD)
{
VaR value = This. strengthvalue (PWD );
For (VAR I = 0; I <this. levelvalue. length; I ++)
{
If (value> = This. levelvalue [I])
Return this. level [I];
}
}

Alert (passwordstrength. strengthlevel ("23 "));
Alert (passwordstrength. strengthlevel ("abcd123 "));
Alert (passwordstrength. strengthlevel ("ABCD! % 23 "));
</SCRIPT>