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js验证密码强弱

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"></td>                <td id="strength_M" style="width: 100px; height: 19px;" align="center"></td>                <td id="strength_H" style="width: 100px; height: 19px;" align="center"></td>            </tr>        </table>    </div>    </form></body></html>

 

效果如图: