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javascript 检测密码强度

2014-01-15 17:08 387 查看

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
<script type="text/javascript">
//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:
document.getElementById("msg").innerHTML='?';
Lcolor = Mcolor = Hcolor = O_color;
case 1:
Lcolor = L_color;
Mcolor = Hcolor = O_color;
document.getElementById("msg").innerHTML='Weak';
break;
case 2:
Lcolor = Mcolor = M_color;
Hcolor = O_color;
document.getElementById("msg").innerHTML='Normal';
break;
default:
document.getElementById("msg").innerHTML='Strong';
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>
</head>
<body>
<form name="form1" action="">
输入密码:<input type="password" size="10" onkeyup="pwStrength(this.value)" onblur="pwStrength(this.value)">
<br>
密码强度:
<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">
强
</td>
</tr>
</table>
</form>
<div id="msg"></div>
</body>
</html>

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