function passwordLevel(password) {
 var Modes = 0;
 for (i = 0; i < password.length; i++) {
 Modes |= CharMode(password.charCodeAt(i));
 }
 return bitTotal(Modes);
 //CharMode函数
 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) || (iN >= 65 && iN <= 90))
 //大小写
  return 4;
 else
  return 8; //特殊字符
 }
 //bitTotal函数
 function bitTotal(num) {
 modes = 0;
 for (i = 0; i < 4; i++) {
  if (num & 1) modes++;
  num >>>= 1;
 }
 return modes;
 }
}

passwordLevel("123456") //返回1

passwordLevel("Abc'123456") //返回4

//添加验证方法：至少包含两种规则

$.validator.addMethod("strongPsw",function(value,element){
 if(passwordLevel(value)==1){returnfalse;}
 returntrue
},"格式不符合");
//开始验证

$(".form").validate({
 rules:{
 pwd:{
  required:true, //必填
  minlength:6, //最小长度
  maxlength:32, //最大长度
  strongPsw:true, //密码强度
 },
 repwd:{
  required:true,
  minlength:6,
  maxlength:32,
  equalTo:"#pwd" //再次填写密码需一致
 }
 }
});