判別 # 密碼強度
<Form>
<form name="form1" action="" >
輸入密碼: <input type="password" size="10" onKeyUp="pwStrength(this.value)" onBlur="pwStrength(this.value)"><br>
密碼強度:
<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">弱</td>
<td width="33%" id="strength_M">中</td>
<td width="33%" id="strength_H">強</td>
</tr>
</table>
</form>
輸入密碼: <input type="password" size="10" onKeyUp="pwStrength(this.value)" onBlur="pwStrength(this.value)"><br>
密碼強度:
<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">弱</td>
<td width="33%" id="strength_M">中</td>
<td width="33%" id="strength_H">強</td>
</tr>
</table>
</form>
--- JS Code ---
//判斷字元屬性 function CharMode(iN){
if (iN>=48 && iN <=57) //數字
return 1;
if (iN>=65 && iN <=90) //大寫字母
return 2;
if (iN>=97 && iN <=122) //小寫字母
return 4;
else
return 8; //特殊字元
}
//統計所有密碼模式
function bitTotal(num){
modes=0;
for (i=0;i<4;i++){
if (num & 1) modes++;
num>>>=1;
}
return modes;
}
//顯示密碼的強度級別
function checkStrong(sPW){
if (sPW.length<=4)
return 0; //密碼太短
Modes=0;
//測試每一字元的類別並統計
for (i=0;i<sPW.length;i++){
Modes|=CharMode(sPW.charCodeAt(i));
}
return bitTotal(Modes);
}
//顯示級別顏色狀況
function pwStrength(pwd){
O_color="#eeeeee";
L_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=L_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;
}