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//CharMode函数
//测试某个字符是属于哪一类.
function CharMode(iN) {
if (iN >= 48 && iN <= 57) //数字
return 1;
if (iN >= 65 && iN <= 90) //大写字母
return 2;
if (iN >= 97 && iN <= 122) //小写
return 4;
else
return 8; //特殊字符
}
//bitTotal函数
//计算出当前密码当中一共有多少种模式
function bitTotal(num) {
modes = 0;
for (i = 0; i < 4; i++) {
if (num & 1)
modes++;
num >>>= 1;
}
return modes;
}
//checkStrong函数
//返回密码的强度级别
function checkStrong(sPW) {
if (sPW.length <= 4)
return 0; //密码太短
Modes = 0;
for (i = 0; i < sPW.length; i++) {
//测试每一个字符的类别并统计一共有多少种模式.
Modes |= CharMode(sPW.charCodeAt(i));
}
return bitTotal(Modes);
}
//pwStrength函数
//当用户放开键盘或密码输入框失去焦点时,根据不同的级别显示不同的颜色
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;
}
使用<input type="password" size=10 onKeyUp=pwStrength(this.value);onBlur=pwStrength(this.value)>来触发
使用<td width="33%" id="strength_L"> 弱 </td>等,来接收 |
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