js密码强度验证

最新推荐文章于 2022-04-24 12:06:10 发布

Dlinlin

最新推荐文章于 2022-04-24 12:06:10 发布

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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>
<title></title>
<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 = "#FF0000"; 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>
<form name="form1" action="">
输入密码:<input type="password" size="10" onkeyup="pwStrength(this.value)" onblur="pwStrength(this.value)">
<br>
密码强度:
<table width="217" border="1" cellspacing="0" cellpadding="1" bordercolor="#cccccc"
height="23" style='display: inline'>
<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">
强
</td>
</tr>
</table>
</form>
<br /><br /><br />

</body>
</html>