js验证密码强弱

浏览数：42 / 时间：2015年06月09日

JS密码强度验证

<%@ Page Language="C#" %>

<!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 id="Head1" runat="server">
    <title>无标题页</title>
    <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|=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>  
</head>
<body>
    <form id="form1" runat="server">
    <div>
        输入密码:<input id="TextBox1" runat="server" onkeyup="pwStrength(this.value)" onblur="pwStrength(this.value)" /><br />
        密码强度:
        <table border="1" cellpadding="1" cellspacing="1" borderColorDark="#fdfeff" borderColorLight="#99ccff" 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>
    </form>
</body>
</html>