JS判断密码强度

<html>
<head>
<title>JS判断密码强度</title>
<script language=javascript>  
	//判断输入密码的类型  
	function CharMode(iN){  
		if (iN>=48 && iN <=57) //数字  
			return 1;  
		if (iN>=65 && iN <=90) //大写  
			return 2;  
		if (iN>=97 && iN <=122) //小写  
			return 4;  
		else  
			return 8;   
	}
	//bitTotal函数  
	//计算密码模式  
	function bitTotal(num){  
		modes=0;  
		for (i=0;i<4;i++){  
			if (num & 1) modes++;  
			num>>>=1;  
		}
		return modes;  
	}
	//返回强度级别  
	function checkStrong(sPW){  
		if (sPW.length<=4)  
			return 0; //密码太短  
		Modes=0;  
		for (i=0;i<sPW.length;i++){  
			//密码模式  
			Modes|=CharMode(sPW.charCodeAt(i));  
		}
		return bitTotal(Modes);  
	}
  
	//显示颜色  
	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>
</head>
<body>
<form name=form1 action="" >
	<table width="250" border="0" cellpadding=2" bordercolor="#eeeeee" style='display:inline'>
		<tr>
			<td width="40%" align="right">密码:</td>
			<td colspan="3" align="left">
				<input type=password size=20 onKeyUp=pwStrength(this.value) onBlur=pwStrength(this.value)>
			</td>
		</tr> 
		<tr align="center">
			<td width="40%" align="right">密码强度:</td>
			<td width="20%" id="strength_L" bgcolor="#f5f5f5">弱</td>  
			<td width="20%" id="strength_M" bgcolor="#f5f5f5">中</td>  
			<td width="20%" id="strength_H" bgcolor="#f5f5f5">强</td>  
		</tr>
	</table>
</form>
</body>
</html>

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