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<head>
<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]) } };
//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>
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