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js-learning-process
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评论字数统计.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .wrapper{
            min-width: 400px;
            max-width: 800px;
            display: flex;
            justify-content: flex-end;
        }

        .avatar{
            width: 48px;
            height: 48px;
            border-radius: 50%;
            overflow: hidden;
            background: url(./image/1.jpg) no-repeat center / cover;
            margin-right: 20px;
        }
        .wrapper textarea{
            outline: none;
            border-color: transparent;
            resize: none;
            background: #f5f5f5;
            border-radius: 4px;
            flex: 1;
            padding: 10px;
            transition: all 0.5s;
            height: 30px;
        }
        .wrapper textarea:focus{
            border-color: #e4e4e4;
            background: #fff;
            height: 50px;
        }
        .wrapper button{
            background: #00aeec;
            color: #fff;
            border: none;
            border-radius: 4px;
            margin-left: 10px;
            width: 70px;
            cursor: pointer;
        }
        .wrapper .total{
            margin-right: 80px;
            color: #999;
            margin-top: 5px;
            opacity: 0;
            transition: all 0.5s;
        }
        .list {
            min-width: 480px;
            max-width: 800px;
            display: flex;
        }
        .lis .item{
            width: 100%;
            display: flex;
        }
        .lis .item .info{
            flex: 1;
            border-bottom: 1px dashed #e4e4e4;
            padding-bottom: 10px;
        }
        .lis .item p{
            margin: 0;
        }
        .lis .item .name{
            color: #fb7299;
            font-size: 14px;
            font-weight: bold;
        }
        .lis .item .text{
            color: #333;
            padding: 10px 0;
        }
        .lis .item .time{
            color: #999;
            font-size: 12px;
        }
    </style>
</head>
<body>
    <div class="wrapper">
        <i class="avatar"></i>
        <textarea name="" id="tx" cols="30" rows="2" placeholder="发一条友善的评论" maxlength=""></textarea>
        <button>发布</button>
    </div>
    <div class="wrapper">
        <span class="total">0/200字</span>
    </div>
    <div class="list">
        <div class="item" style="display:none;">
            <i class="avatar"></i>
            <div class="info">
                <p class="name">清风徐来</p>
                <p class="text">大家辛苦了，感谢各位大大的努力，能圆满完成真是太好了</p>
                <p class="time">2023-7-19 11:20</p>
            </div>
        </div>
    </div>

    <script>
        const tx = document.querySelector('#tx')
        const total = document.querySelector('.total')
        //获取焦点 total显示出来
        tx.addEventListener('focus',function(){
            total.style.opacity=1
        })
        //失去焦点 total隐藏
        tx.addEventListener('blur',function(){
            total.style.opacity=0
        })
        //检测用户输入
        tx.addEventListener('input',function(){
            //输入的长度
            // console.log(tx.value.length);
            total.innerHTML=`${tx.value.length}/200字`
        })
    </script>
</body>
</html>