js实现的密码强度检测的两个实例

第一个实例

这段JavaScript代码比较实用，它完成用户注册时判断用户输入密码的强度，分强、弱、中三等级，它可以根据用户输入的密码显示对应的密码强弱等级，方便用户改进输入。

实现代码：

<code class="language-html">

<title>JS判断密码强度</title>
<script language="javascript"> 
//判断输入密码的类型 
function CharMode(iN){ 
if (iN>=48 && iN <=57) //数字 
return 1; 
if (iN>=65 && iN <=90) //大写 
return 2; 
if (iN>=97 && iN <=122) //小写 
return 4; 
else 
return 8;  
} 
//bitTotal函数 
//计算密码模式 
function bitTotal(num){ 
modes=0; 
for (i=0;i<4;i++){ 
if (num & 1) modes++; 
num>>>=1; 
} 
return modes; 
} 
//返回强度级别 
function checkStrong(sPW){ 
if (sPW.length<=4) 
return 0; //密码太短 
Modes=0; 
for (i=0;i<sPW.length;i++){ 
//密码模式 
Modes|=CharMode(sPW.charCodeAt(i)); 
} 
return bitTotal(Modes); 
} 
  
//显示颜色 
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>

 
<form name="form1" action=""> 
密码:<input type="password" size="8" onkeyup="pwStrength(this.value)" onblur="pwStrength(this.value)"> 
<br>密码强度: 
<table width="210" border="1" cellspacing="0" cellpadding="1" bordercolor="#eeeeee" height="22" style="display:inline"> 
<tr align="center" bgcolor="#f5f5f5"> 
<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>

</code>

在线运行

第二个实例：

<code class="language-javascript">
function AuthPasswd(string) {
    if (string.length >= 6) {
        if (/[a-zA-Z]+/.test(string) && /[0-9]+/.test(string) && /\W+\D+/.test(string)) {
            noticeAssign(1);
        } else if (/[a-zA-Z]+/.test(string) || /[0-9]+/.test(string) || /\W+\D+/.test(string)) {
            if (/[a-zA-Z]+/.test(string) && /[0-9]+/.test(string)) {
                noticeAssign( - 1);
            } else if (/\[a-zA-Z]+/.test(string) && /\W+\D+/.test(string)) {
                noticeAssign( - 1);
            } else if (/[0-9]+/.test(string) && /\W+\D+/.test(string)) {
                noticeAssign( - 1);
            } else {
                noticeAssign(0);
            }
        }
    } else {
        noticeAssign(null);
    }
}

function noticeAssign(num) {
    if (num == 1) {
        $('#weak').css({
            backgroundColor: '#009900'
        });
        $('#middle').css({
            backgroundColor: '#009900'
        });
        $('#strength').css({
            backgroundColor: '#009900'
        });
        $('#strength').html('很强');
        $('#middle').html('');
        $('#weak').html('');
    } else if (num == -1) {
        $('#weak').css({
            backgroundColor: '#ffcc33'
        });
        $('#middle').css({
            backgroundColor: '#ffcc33'
        });
        $('#strength').css({
            backgroundColor: ''
        });
        $('#weak').html('');
        $('#middle').html('中');
        $('#strength').html('');
    } else if (num == 0) {
        $('#weak').css({
            backgroundColor: '#dd0000'
        });
        $('#middle').css({
            backgroundColor: ''
        });
        $('#strength').css({
            backgroundColor: ''
        });
        $('#weak').html('弱');
        $('#middle').html('');
        $('#strength').html('');
    } else {
        $('#weak').html(' ');
        $('#middle').html(' ');
        $('#strength').html(' ');
        $('#weak').css({
            backgroundColor: ''
        });
        $('#middle').css({
            backgroundColor: ''
        });
        $('#strength').css({
            backgroundColor: ''
        });
    }
} /</code>