JS判断密码强度的代码

短命女 2022-08-21 04:51 186阅读 0赞

<html>
    <head>
    <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>
    </head>
    <body>  
    <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>
    </body>
    </html>