dom里面的密码强弱判断 - 黑马程序员技术交流社区

<!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>
<title></title>
<script type="text/javascript">
window.onload = function () {
document.getElementById('pwd').onchange = function () {
var tds = document.getElementsByTagName('td');
for (var i = 0; i < tds.length; i++) {
tds[i].style.backgroundColor = '#E6E6E6';
}
var pwdvalue = this.value;
if (pwdvalue.length > 0) {
var flag = checkPwd(pwdvalue);
if (flag <= 1) {
document.getElementsByTagName('td')[0].style.backgroundColor = 'red';
} else if (flag == 2) {
document.getElementsByTagName('td')[0].style.backgroundColor = 'orange';
document.getElementsByTagName('td')[1].style.backgroundColor = 'orange';
} else if (flag == 3) {
document.getElementsByTagName('td')[0].style.backgroundColor = 'green';
document.getElementsByTagName('td')[1].style.backgroundColor = 'green';
document.getElementsByTagName('td')[2].style.backgroundColor = 'green';
}
}
};
};
function checkPwd(pwd) {
var i = 0;
if (pwd.match(/\d/)) {
i++;
}
if (pwd.match(/[a-zA-Z]/)) {
i++;
}
if (pwd.match(/^[a-zA-Z0-9]/)) {
i++;
}
// if (pwd.length < 6) {
// i--;
// }
return i;
}
</script>
</head>
<body>
<input id="pwd" type="password" name="name" value="" />
<table border="1" style=" width:300px; height:30px; text-align:center; background-color:#E6E6E6; ">
<tr >
<td>低
</td>
<td>中
</td>
<td>高
</td>
</tr>
</table>
</body>
</html>

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