Js密码强度实时验证代码

效果图:

演示代码:

<!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 id="Head1" runat="server"> 
<title>密码强度测试</title> 
</head> 
<script language="javascript" 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="#e0f0ff"; 
L_color="#FF0000"; 
M_color="#FF9900"; 
H_color="#33CC00"; 
if (pwd==null||pwd==''){ 
Lcolor=Mcolor=Hcolor=O_color; 
} 
else 
{ 
S_level=checkStrong(pwd); 
//alert(S_level); 
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> 
<body> 
<form id="form1"> 
 
输入密码:<input type="text" id="TextBox1" onkeyup="pwStrength(this.value)" onblur="pwStrength(this.value)"><br> 
密码强度: 
<table border="1" cellpadding="1" bordercolordark="#fdfeff" bordercolorlight="#99ccff" 
cellspacing="1" style="width: 200px; display: inline; background-color: #e0f0ff"> 
<tr> 
<td id="strength_L" style="width: 100px; height: 19px;" align="center"> 
弱 
</td> 
<td id="strength_M" style="width: 100px; height: 19px;" align="center"> 
中 
</td> 
<td id="strength_H" style="width: 100px; height: 19px;" align="center"> 
强 
</td> 
</tr> 
</table> 
 
</form> 
</body> 
</html>

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