密码强度验证_form>p>span:nth-child(1).active-优快云博客

本文链接：https://blog.youkuaiyun.com/qq_52291147/article/details/129883018

此HTML代码实现了一个简单的密码输入表单，通过JavaScript监听输入事件，使用正则表达式检查密码的数字、小写字母和特殊字符，根据匹配的数量动态更新‘弱’、‘中’、‘强’的视觉反馈，指示密码强度。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        *{
            margin: 0;
            padding: 0;
        }
        form{
            width: 500px;
            padding: 20px;
            border: 3px solid gray;
            margin: 50px auto;
        }
        form>label{
            width: 100%;
            height: 70px;
        }
        form>label>input{
            width: 100%;
            box-sizing: border-box;
            padding-left: 30px;
            font-size: 20px;
            height: 50px;
        }
        form>p{
            width: 100%;
            margin-top: 10px;
            display: flex;
            justify-content: space-between;
        }
        form>p>span{
            width: 30%;
            background-color: #ccc;
            color: #fff;
            height: 30px;
            font-size: 20px;
            line-height: 30px;
            text-align: center;
        }
        form>p>span:nth-child(1).active{
            background-color: red;
        }
        form>p>span:nth-child(2).active{
            background-color: orange;
        }
        form>p>span:nth-child(3).active{
            background-color: green;
        }
    </style>
</head>
<body>
    <form>
        <label>
            <input type="text"/>
        </label>
        <p>
            <span>弱</span>
            <span>中</span>
            <span>强</span>
        </p>
    </form>

    <script>
        var oInput = document.querySelector("input")
        var oSpan = document.querySelectorAll("span")
        oInput.oninput = function(event){
            // console.log(this.value)
            // console.log(event.target.value)
            var reg1 = /\d/
            var reg2 = /[a-z]/i
            var reg3 = /[!@#$%^&*()]/
            var level = 0//每次重置level，1表示满足一个正则，2表示满足两个，3表示满足三个
            if(reg1.test(this.value)) level++
            if(reg2.test(this.value)) level++
            if(reg3.test(this.value)) level++
            // console.log(level)//根据1，2，3判断强弱
            for(var i=0;i<oSpan.length;i++){
                oSpan[i].classList.remove("active")
                if(i<level){
                    oSpan[i].classList.add("active")
                }
            }

        }
    </script>
</body>
</html>

效果显示：