日期:2014-05-16  浏览次数:20390 次

JS要来自动判断密码的安全强度

先看效果

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代码
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
    
    <title>用于判断密码的安全强度</title>
    
	<meta http-equiv="pragma" content="no-cache">
	<meta http-equiv="cache-control" content="no-cache">
	<meta http-equiv="expires" content="0">    
	<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
	<meta http-equiv="description" content="This is my page">
	<script type="text/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="#FF4040"; 
		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>
   	<table>
   		<tr id ="tr_Password2">
          <td height="30" align="right" >密码:</td>
          <td>
          <input type="password" name="password" class="input1" onKeyUp="pwStrength(this.value)" onBlur="pwStrength(this.value)">
          <font color="red">*</font>
          </td>
        </tr>
        <tr id ="tr_ConfirmPassword2">
          <td height="30" align="right" >确认密码:</td>
          <td><input type="password" name="passCf" class="input1">
          <font color="red">*</font>
          </td>
        </tr>
        <tr>
        	<td align="right">密码强度:</td>
        	<td>
				<table  border="1" cellspacing="0" cellpadding="1" height="20" style="border-color: #5b5b5b;"> 
				<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">安全</td> 
				</tr> 
				</table>        	
        	</td>
        </tr> 
   	</table>
  </body>
</html>
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