Js密码强度设置

 

代码 
<!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>密码强度测试</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|=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);
             //alert(S_level);
             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>
    <form id="form1">
    <div>
        输入密码:<input type="text" 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>
    </form>
</body>
</html>

 

 

 

posted on 2010-06-05 21:45  sallen  阅读(352)  评论(0)  编辑  收藏  举报