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<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>
密码强度检测
</title>
<style type="text/css">
body{font:12px/1.5 Arial;} input{float:left;font-size:12px;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;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>