<script>
function AuthPasswd(string) {
 if(string.length >=6) {
  if(/[a-zA-Z]+/.test(string) && /[0-9]+/.test(string) && /W+D+/.test(string)) {
   noticeAssign(1);
  }else if(/[a-zA-Z]+/.test(string) || /[0-9]+/.test(string) || /W+D+/.test(string)) {
   if(/[a-zA-Z]+/.test(string) && /[0-9]+/.test(string)) {
    noticeAssign(-1);
   }else if(/[a-zA-Z]+/.test(string) && /W+D+/.test(string)) {
    noticeAssign(-1);
   }else if(/[0-9]+/.test(string) && /W+D+/.test(string)) {
    noticeAssign(-1);
   }else{
    noticeAssign(0);
   }
  }
 }else{
  noticeAssign(null); 
 }
}

function noticeAssign(num) {
 if(num == 1) {
  $('#weak').css({backgroundColor:'#009900'});
  $('#middle').css({backgroundColor:'#009900'});
  $('#strength').css({backgroundColor:'#009900'});
  $('#strength').html('很强');
  $('#middle').html('');
  $('#weak').html('');
 }else if(num == -1){
  $('#weak').css({backgroundColor:'#ffcc33'});
  $('#middle').css({backgroundColor:'#ffcc33'});
  $('#strength').css({backgroundColor:''});
  $('#weak').html('');
  $('#middle').html('中');
  $('#strength').html('');
 }else if(num ==0) {
  $('#weak').css({backgroundColor:'#dd0000'});
  $('#middle').css({backgroundColor:''});
  $('#strength').css({backgroundColor:''});
  $('#weak').html('弱');
  $('#middle').html('');
  $('#strength').html('');
 }else{
  $('#weak').html('&nbsp;');
  $('#middle').html('&nbsp;');
  $('#strength').html('&nbsp;');
  $('#weak').css({backgroundColor:''});
  $('#middle').css({backgroundColor:''});
  $('#strength').css({backgroundColor:''});
 }
}
</script>

function testpass(password,username)
{
 var score = 0;
 if (password.length < 4 ) { return -4; }
 if (typeof(username) != 'undefined' && password.toLowerCase() == username.toLowerCase()){return -2}
 score += password.length * 4;
 score += ( repeat(1,password).length - password.length ) * 1;
 score += ( repeat(2,password).length - password.length ) * 1;
 score += ( repeat(3,password).length - password.length ) * 1;
 score += ( repeat(4,password).length - password.length ) * 1;
 if (password.match(/(.*[0-9].*[0-9].*[0-9])/)){ score += 5;}
 if (password.match(/(.*[!,@,#,$,%,^,&,*,?,_,~].*[!,@,#,$,%,^,&,*,?,_,~])/)){ score += 5 ;}
 if (password.match(/([a-z].*[A-Z])|([A-Z].*[a-z])/)){ score += 10;}
 if (password.match(/([a-zA-Z])/) && password.match(/([0-9])/)){ score += 15;}
 if (password.match(/([!,@,#,$,%,^,&,*,?,_,~])/) && password.match(/([0-9])/)){ score += 15;}
 if (password.match(/([!,@,#,$,%,^,&,*,?,_,~])/) && password.match(/([a-zA-Z])/)){score += 15;}
 if (password.match(/^w+$/) || password.match(/^d+$/) ){ score -= 10;}
 if ( score < 0 ){score = 0;}
 if ( score > 100 ){ score = 100;}
 return score;
 
 function repeat(len,str)
 {
  var res = "";
  for (var i = 0; i < str.length; i++ )
  {
   var repeated = true;
   for (var j = 0, max = str.length - i - len; j < len && j < max; j++)
   {
    repeated = repeated && (str.charAt(j + i) == str.charAt(j + i + len));
   }
   if (j < len) repeated = false;
   if (repeated) {
    i += len - 1;
    repeated = false;
   }
   else
   {
    res += str.charAt(i);
   }
  }
  return res;
 }
}

function checkpass(pass)
{
    var username = document.getElementById('username').value;
    var score = testpass(pass.value,username);
    var password_label = document.getElementById('password_label');
    if(score == -4)
    {
        password_label.innerHTML = '太短';
    }
    else if(score == -2)
    {
        password_label.innerHTML = '与用户名相同';
    }
    else
    {
        var color = score < 34 ? '#edabab' : (score < 68 ? '#ede3ab' : '#d3edab');
        var text = score < 34 ? '弱' : (score < 68 ? '一般' : '很好');
        var width = score + '%';
        password_label.innerHTML = "<span style='width:"+width+";display:block;overflow:hidden;height:20px;line-height:20px;background:"+color+";'>"+text+"</span>";
    }
}
</script>
请输入用户名：<br>
<input type="text" class="inpt" name="username" style="width:160px" id="username" /><br>
请输入密码：<br>
<input type="password" class="inpt" style="width:160px" onkeyup="javascript:checkpass(this)" name="pass" id="pass" /><br>
<span id="password_label" style="width:160px;border:1px solid #F0F0F0"></span>

<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)>
<br>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>