js 密码强度检测
<!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"> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>密码强度</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); //console.log(S_level); switch(S_level) { case 0: Lcolor=Mcolor=Hcolor=O_color; break; 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> <style> table td{ background:#E0F0FF;} </style> <body> <form id="form1"> <div> 输入密码: <input type="password" id="TextBox1" onkeyup="pwStrength(this.value)" onblur="pwStrength(this.value)"><br> 密码强度: <table border="0" cellpadding="0" bordercolordark="#fdfeff" bordercolorlight="#99ccff" cellspacing="0" style="width: 200px; display: inline; margin-top:2px;"> <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>
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