js/简单实现输入密码检查密码强度功能

最近在做项目,需要更加输入密码自动显示密码强度(红色:低,黄色:中,绿色:强)的功能,这里做下记录

js脚本代码

<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) {
            //密码长度
            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. 
                //目前未知|=的意思
                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"; //白色
            L_color = "#FF0000"; //绿色
            M_color = "#FF9900"; //黄色
            H_color = "#33CC00"; //红色
            if (pwd == null || pwd == '') {
                //不用var声明变量连=号连接赋值
                Lcolor = Mcolor = Hcolor = O_color;
            }
            else {
                //检查字符串安全级别返回级别数据进行判断
                S_level = checkStrong(pwd);
                //判断密码级别
                switch (S_level) {
                    case 0:
                        //给每个变量赋颜色
                        Lcolor = Mcolor = Hcolor = O_color;
                    case 1:
                        //给每个变量赋颜色
                        Lcolor = L_color;
                        Mcolor = Hcolor = O_color;
                        break;
                    case 2:
                        //给每个变量赋颜色
                        Lcolor = Mcolor = M_color;
                        Hcolor = O_color;
                        break;
                    default:
                        //给每个变量赋颜色
                        Lcolor = Mcolor = Hcolor = H_color;
                }
            }
            //向每个单元格赋颜色
            document.getElementById("strength_L").style.background = Lcolor;
            document.getElementById("strength_M").style.background = Mcolor;
            document.getElementById("strength_H").style.background = Hcolor;
            return;
        }
</script>

html 代码

<form name="form1" action="" > 
<div style="width:280px; height: 300px; border-color: blue;">
输入密码:
<input type="password" size="20" onKeyUp="pwStrength(this.value);" onBlur="pwStrength(this.value);"/><br>
密码强度: 
 <div style="width:270px;height:5px;margin-top:5px;">
     <!--效果1: 显示对应长度及颜色 -->
     <div id="strength_L"  style="width:80px;height:10px;float:left;border-right:6px solid #fff;"></div>
     <div id="strength_M"  style="width:80px;height:10px;float:left;border-right:6px solid #fff;"></div>
     <div id="strength_H"  style="width:80px;height:10px;float:left;border-right:0px solid #fff;"></div>
     <!--效果2: 显示对应文字、长度及颜色 -->
    <!-- <div id="strength_L"  style="width:80px;height:30px;float:left;border-right:6px solid #fff;text-align: center; border:1px solid bisque;">低</div>
     <div id="strength_M"  style="width:80px;height:30px;float:left;border-right:6px solid #fff;text-align: center;border:1px solid bisque;">中</div>
     <div id="strength_H"  style="width:80px;height:30px;float:left;border-right:0px solid #fff;text-align: center;border:1px solid bisque;">高</div> -->
 </div>
</div>
</form>

效果1:

 

 

 

 效果2:

 

 

 整体Demo源码

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<title>测试页面</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) {
            //密码长度
            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. 
                //目前未知|=的意思
                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"; //白色
            L_color = "#FF0000"; //绿色
            M_color = "#FF9900"; //黄色
            H_color = "#33CC00"; //红色
            if (pwd == null || pwd == '') {
                //不用var声明变量连=号连接赋值
                Lcolor = Mcolor = Hcolor = O_color;
            }
            else {
                //检查字符串安全级别返回级别数据进行判断
                S_level = checkStrong(pwd);
                //判断密码级别
                switch (S_level) {
                    case 0:
                        //给每个变量赋颜色
                        Lcolor = Mcolor = Hcolor = O_color;
                    case 1:
                        //给每个变量赋颜色
                        Lcolor = L_color;
                        Mcolor = Hcolor = O_color;
                        break;
                    case 2:
                        //给每个变量赋颜色
                        Lcolor = Mcolor = M_color;
                        Hcolor = O_color;
                        break;
                    default:
                        //给每个变量赋颜色
                        Lcolor = Mcolor = Hcolor = H_color;
                }
            }
            //向每个单元格赋颜色
            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="" > 
<div style="width:280px; height: 300px; border-color: blue;">
输入密码:
<input type="password" size="20" onKeyUp="pwStrength(this.value);" onBlur="pwStrength(this.value);"/><br>
密码强度: 
 <div style="width:270px;height:5px;margin-top:5px;">
     <!--效果1: 显示对应长度及颜色 -->
    <!-- <div id="strength_L"  style="width:80px;height:10px;float:left;border-right:6px solid #fff;"></div>
     <div id="strength_M"  style="width:80px;height:10px;float:left;border-right:6px solid #fff;"></div>
     <div id="strength_H"  style="width:80px;height:10px;float:left;border-right:0px solid #fff;"></div> -->
     <!--效果2: 显示对应文字、长度及颜色 -->
    <div id="strength_L"  style="width:80px;height:30px;float:left;border-right:6px solid #fff;text-align: center;border:1px solid bisque;"></div>
    <div id="strength_M"  style="width:80px;height:30px;float:left;border-right:6px solid #fff;text-align: center;border:1px solid bisque;"></div>
    <div id="strength_H"  style="width:80px;height:30px;float:left;border-right:0px solid #fff;text-align: center;border:1px solid bisque;"></div>
 </div>
</div>
</form>
</body>
</html>

 

posted @ 2021-09-09 11:21  小小邪  阅读(1086)  评论(0编辑  收藏  举报