Js验证input密码强度

【用户注册使用】

【源代码】

<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta charset="utf-8" />
<title>Js验证input密码强度</title>
<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 
function checkStrong(sPW){ 
if (sPW.length<=4) 
return 0; //密码太短 
Modes=0; 
for (i=0;i<sPW.length;i++){ 
Modes|=CharMode(sPW.charCodeAt(i)); 
} 
return bitTotal(Modes); 
} 
//pwStrength函数 
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>
</head>
<body>
<center>
<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>
</body>
</html>

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