var PasswordStrength ={
     Level : ["3","2","1"],
     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 * 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];
     }
 }