javascript 检测密码强度

<!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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javascript 检测密码强度

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