The strength verification of JS Common password and the judgement function of uppercase and lowercase letters

The strength verification of JS Common password and the judgement function of uppercase and lowercase letters
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function Charmode (in) {
if (in>=65 && in <=90)//Uppercase
return 2;
if (in>=97 && in <=122)//lowercase
return 4;
Else
return 1; Digital
}
Calculates how many patterns there are in the current password
function Bittotal (num) {
modes=0;
for (i=0;i<3;i++) {
if (num & 1) modes++;
num>>>=1;
}
return modes;
}
Checkstrong function returns the strength level of the password
function Checkstrong (SPW) {
modes=0;
for (i=0;i<spw.length;i++) {
Test the category of each character and count how many patterns there are.
Modes|=charmode (Spw.charcodeat (i));
}
var btotal = bittotal (modes);
if (spw.length >=) btotal++;
Switch (btotal) {
Case 1:
Return "<table width= ' 130 ' class= ' PS tutorial wstrong ' ><tr><td bgcolor= ' #fe707e ' ><strong> weak </ Strong></td><td><span style= ' color: #666; ' > </span></td><td><span style= ' color: #666; ' > Strong </span></td></tr></table> ";
Break
Case 2:
Return "<table width= ' 130 ' class= ' Pswstrong ' ><tr><td bgcolor= ' #fcfa93 ' ><span style= ' color: #666 ;' > Weak </span></td><td bgcolor= ' #fcfa93 ' ><strong> in </strong></td><td> <span style= ' color: #666; ' > Strong </span></td></tr></table> ";
Break
Case 3:
Return "<table width= ' 130 ' class= ' Pswstrong ' ><tr><td bgcolor= ' #bdfea6 ' ><span style= ' color: #666 ;' > Weak </span></td><td bgcolor= ' #bdfea6 ' ><span style= ' color: #666; ' > </span></td><td bgcolor= ' #bdfea6 ' ><strong> strong </strong></td></tr> </table> ";
Break
Default
Return "<font color= ' #33cc00 ' > Strong </font>";
}
}