js实现指定密码长度

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我是靠谱客的博主可爱小鸽子，这篇文章主要介绍js实现指定密码长度，现在分享给大家，希望可以做个参考。

在这里插入图片描述

复制代码

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        div{
            width: 600px;
            margin: 100px auto;
        }
        div img{
            /*display: inline-block;*/
            width: 10px;
        }
        .message{
            display: inline-block;
            font-size: 12px;
            color:#999;
            background:no-repeat left center;
            padding-left: 20px;
        }

.wrong{
            color: red;
        }

.right{
            color: green;
        }
    </style>
</head>
<body>
    <div class="register">
        <input type="password" class="ipt">
        <img src="二维码.jpg">
        <p class="message">请输入9-16位密码</p>
    </div>
    <script>
        var ipt=document.querySelector('.ipt');
        var message=document.querySelector('.message');
        var img=document.querySelector('img');
        ipt.onblur=function () {
            if (ipt.value.length<6||ipt.value.length>16){
                message.className='message wrong';
                message.innerHTML='你输入的位数不在6~16之间';
                img.src='谭雅.png';
            }else{
                message.className='message right';
                message.innerHTML='格式正确';
                img.src='屏幕截图(19).png';
            }
        }
    </script>
</body>
</html>

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        div{
            width: 600px;
            margin: 100px auto;
        }
        div img{
            /*display: inline-block;*/
            width: 10px;
        }
        .message{
            display: inline-block;
            font-size: 12px;
            color:#999;
            background:no-repeat left center;
            padding-left: 20px;
        }

        .wrong{
            color: red;
        }

        .right{
            color: green;
        }
    </style>
</head>
<body>
    <div class="register">
        <input type="password" class="ipt">
        <img src="二维码.jpg">
        <p class="message">请输入9-16位密码</p>
    </div>
    <script>
        var ipt=document.querySelector('.ipt');
        var message=document.querySelector('.message');
        var img=document.querySelector('img');
        ipt.onblur=function () {
            if (ipt.value.length<6||ipt.value.length>16){
                message.className='message wrong';
                message.innerHTML='你输入的位数不在6~16之间';
                img.src='谭雅.png';
            }else{
                message.className='message right';
                message.innerHTML='格式正确';
                img.src='屏幕截图(19).png';
            }
        }
    </script>
</body>
</html>