js在客户端验证密码强度，兼容FireFox和IE_javascript技巧

<script language="JavaScript"> function EvaluatePassword(word) { if (word == "") { return 0; } else if (word.length < 6) { return 1; } else { return word.match(/[a-z](?![^a-z]*[a-z])|[A-Z](?![^A-Z]*[A-Z])|\d(?![^\d]*\d)|[^a-zA-Z\d](?![a-zA-Z\d]*[^a-zA-Z\d])/g).length; } } var test = new Array("", "a1_", "abcdef", "abcde123", "ads23%", "aA1B2^&2"); for(var i in test) { document.write(test[i] + " 的密码强度为" + EvaluatePassword(test[i]) + " "); } </script>
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改成这样的也行……

密码：<input id="txt" onblur="ck(this.value)"><label id="n"></label> <script> function ck(t){ n.innerText=/(?:^(w)1{0,8}$)|^(?:(0?1?2?3?4?5?6?7?8?9?0?)2?$)|^w{0,6}$/i.test(t)?'太简单了':'还行吧'; } </script>
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google效果

<script language="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="#eeeeee"; 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> <form name="form1" action=""> 输入密码:<input type="password" size="10" onkeyup="pwStrength(this.value)" onblur="pwStrength(this.value)"> 密码强度: <table width="217" border="1" cellspacing="0" cellpadding="1" bordercolor="#cccccc" height="23" style="display:inline"> <tr align="center" bgcolor="#eeeeee"> <td width="33%" id="strength_L">弱</td> <td width="33%" id="strength_M">中</td> <td width="33%" id="strength_H">强</td> </tr> </table> </form>
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