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<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
        * {
            margin: 0;
            padding: 0;
        }

        body {
            padding: 100px;
        }

        textarea {
            width: 310px;
            height: 45px;
            border: 1px solid rgb(0, 0, 0);
            font-size: 30px;
            line-height: 45px;

            outline: none;
            resize: none;
        }

        ul {
            margin-top: 50px;
            list-style-type: none;
            width: 310px;
            height: 100vh;
            background-color: aqua;
        }

        li {
            width: 300px;
            padding: 5px;
            background-color: rgb(0, 0, 0);
            color: rgb(255, 255, 255);
            font-size: 14px;
            margin: 15px 0;
        }

        button {
            width: 154px;
            height: 50px;
        }
    </style>
</head>

<body>
    <textarea name="" id="" placeholder="请输入内容"></textarea><br>
    <button id="button1">发布</button>
    <button id="button2">删除</button>

    <ul>

    </ul>
    <script>
        var btn = document.getElementById('button1');
        var text = document.querySelector('textarea');
        var ul = document.querySelector('ul');
        btn.onclick = function () {
            if (text.value == '') {
                alert('您没有输入内容');
                return false;
            } else {
                var li = document.createElement('li');
                li.innerHTML = text.value;
                ul.insertBefore(li, ul.children[0]);
            }
        }
    </script>

    <script>
        var ul = document.querySelector('ul');
        var btn = document.getElementById('button2');
        btn.onclick = function () {
            if (ul.children.length == 0) {
                this.disabled = true;
            } else {
                ul.removeChild(ul.children[0]);
            }
        }
    </script>
</body>

</html>
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# 简易留言板
简易留言板

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