基于密码强度检测代码

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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>密码强度检测</title>
<style type="text/css">
body{font:12px/1.5 Arial;}
input{float:left;font-size:12px;width:150px;font-family:arial;border:1px solid #ccc;padding:3px;}
input.correct{border:1px solid green;}
input.error{border:1px solid red;}
#tips{float:left;margin:2px 0 0 20px;}
#tips span{float:left;width:50px;height:20px;color:#fff;overflow:hidden;background:#ccc;margin-right:2px;line-height:20px;text-align:center;}
#tips.s1 .active{background:#f30;}
#tips.s2 .active{background:#fc0;}
#tips.s3 .active{background:#cc0;}
#tips.s4 .active{background:#090;}
</style>
<script type="text/javascript">
window.onload = function ()
{
var oTips = document.getElementById("tips");
var oInput = document.getElementsByTagName("input")[0];
var aSpan = oTips.getElementsByTagName("span");
var aStr = ["弱", "中", "强", "非常好"];
var i = 0;

oInput.onkeyup = oInput.onfocus = oInput.onblur = function ()
{
  var index = checkStrong(this.value);
  this.className = index ? "correct" : "error";
  oTips.className = "s" + index;
  for (i = 0; i < aSpan.length; i++)aSpan[i].className = aSpan[i].innerHTML = "";
  index && (aSpan[index - 1].className = "active", aSpan[index - 1].innerHTML = aStr[index - 1])
}
};
/** 强度规则
+ ------------------------------------------------------- +
1) 任何少于6个字符的组合，弱；任何字符数的同类字符组合，弱；
2) 任何字符数的两类字符组合，中；
3) 12位字符数以下的三类或四类字符组合，强；
4) 12位字符数以上的三类或四类字符组合，非常好。
+ ------------------------------------------------------- +
**/
//检测密码强度
function checkStrong(sValue)
{
var modes = 0;
if (sValue.length < 6) return modes;
if (/d/.test(sValue)) modes++; //数字
if (/[a-z]/.test(sValue)) modes++; //小写
if (/[A-Z]/.test(sValue)) modes++; //大写
if (/W/.test(sValue)) modes++; //特殊字符
switch (modes)
{
  case 1:
   return 1;
   break;
  case 2:
   return 2;
  case 3:
  case 4:
   return sValue.length < 12 ? 3 : 4
   break;
}
}
</script>
</head>
<body>
<input type="password" value="" maxlength="16" />
<div id="tips"><span></span><span></span><span></span><span></span></div>
</body>
</html>
更多详细内容请查看：http://www.111cn.net/js_a/javascript/39561.htm