检测密码强度

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检测密码强度：

<tr>
<td class="f-name"><span class="from_err">*</span>密码：</td>
<td><input id="11239" name="11239" type="password" class="text" maxlength="1024" value="" />
密码强度：<span id="strength_L"></span><span id="strength_M"></span><span id="strength_H"></span>
</td>
</tr>

<script type="text/javascript">
$(function () {

//触发事件
  $("input[name='11239']").keyup(function () {
pwStrength($(this).val());
}).blur(function () {
pwStrength($(this).val());
})

})

//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 <= 5)
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 = "#e0f0ff";
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;
}
</script>

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