效果图:演示代码: <title>密码强度测试</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); //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> <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> [Ctrl+A 全选 注:如需引入外部Js需刷新才能执行]
