1，验证密码强度的js代码

<script 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="#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>

2，html部分：

<form name=form1 action="" > 输入密码:<input type=password size=10 onKeyUp=pwStrength(this.value) onBlur=pwStrength(this.value)> <br>密码强度: <table width="217" border="1" cellspacing="0" cellpadding="1" bordercolor="#cccccc" height="23"> <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>

3，检验密码强度的JS类

<script type="text/javascript"> var PasswordStrength ={ Level : ["高，实在是高","还行啦","靠，这样也行"], LevelValue : [30,20,0],//强度值 Factor : [1,2,5],//字符加数,分别为字母，数字，其它 KindFactor : [0,0,10,20],//密码含几种组成的加数 Regex : [/[a-zA-Z]/g,/\d/g,/[^a-zA-Z0-9]/g] //字符正则数字正则其它正则 } PasswordStrength.StrengthValue = function(pwd) { var strengthValue = 0; var ComposedKind = 0; for(var i = 0 ; i < this.Regex.length;i++) { var chars = pwd.match(this.Regex[i]); if(chars != null) { strengthValue += chars.length IT之家 this.Factor[i]; ComposedKind ++; } } strengthValue += this.KindFactor[ComposedKind]; return strengthValue; } PasswordStrength.StrengthLevel = function(pwd) { var value = this.StrengthValue(pwd); for(var i = 0 ; i < this.LevelValue.length ; i ++) { if(value >= this.LevelValue[i] ) return this.Level[i]; } } alert(PasswordStrength.StrengthLevel("23")); alert(PasswordStrength.StrengthLevel("abcd123")); alert(PasswordStrength.StrengthLevel("abcd!%23")); </script>