js测试密码强度-优快云博客

网上找来的密码强度测试的js,好东西啊~
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
    <title>无标题页</title>
</head>
<script language="javascript" 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=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>
<body>
    <div>
        输入密码:<input ID="TextBox1" onKeyUp=pwStrength(this.value) onBlur=pwStrength(this.value) /><br />
        密码强度:
        <table border="1" cellpadding="1" borderColorDark="#fdfeff" borderColorLight="#99ccff" cellspacing="1" style="width: 200px; display: inline; background-color:#e0f0ff">
            <tr>
                <td id="strength_L" style="width: 100px; height: 19px;" align="center">弱</td>
                <td id="strength_M" style="width: 100px; height: 19px;" align="center">中</td>
                <td id="strength_H" style="width: 100px; height: 19px;" align="center">强</td>
            </tr>
        </table>
    </div>

</body>
</html>