JavaScript练手题原生制作论坛发帖工具

本文链接：https://blog.youkuaiyun.com/Eternity_matt/article/details/109072978
直接上源代码：
<!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>
        * {
            margin: 0;
            padding: 0;
            list-style: none;
        }

        body {
            font-family: '微软雅黑';
            font-size: 14px;
        }

        .box {
            width: 700px;
            height: 500px;
            border: green 1px solid;
            margin: 50px auto 0;
            position: relative;
        }

        .passBtn {
            width: 140px;
            height: 50px;
            background-color: rgb(7, 153, 14);
            border: none;
            color: #fff;
            font-weight: bold;
            font-size: 16px;
            border-radius: 3px;
            margin: 5px 10px;

        }

        li>img {
            width: 60px;
            border-radius: 50%;
            float: left;
            margin-right: 10px;
        }

        li {
            border-bottom: 1px dashed #ccc;
            padding: 10px 0;
            height: 60px;
            margin: 0 30px;
            position: relative;
        }

        li h2 {
            font-size: 16px;
            /* margin-top: 5px; */
            font-weight: bold;
        }

        li h3 {
            font-size: 15px;
            margin-top: 5px;
            font-weight: normal;
            display: inline-block;
            margin-right: 50px;
        }

        li h4 {
            font-size: 13px;
            margin-top: 5px;
            font-weight: normal;
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
            width: 350px;
        }

        li p {
            display: inline-block; 
            font-size: 11px;
            position: absolute;
            right:  0;
            bottom: 10px;
            color: #ccc;


        }

        .postBox {
            width: 600px;
            height: 400px;
            border: none;
            box-shadow: 2px 2px 4px 2px #888888;
            position: absolute;
            left: 50px;
            top: 50px;
            padding: 10px;
            background-color: #fff;
            display: none;
        }

        .postBox .txt {
            width: 500px;
            height: 40px;
            border: 1px solid #ccc;
            padding-left: 20px;
            margin: 0 auto;
        }

        .postBox .ssbk {
            margin: 20px 20px;
        }

        .ssbk select {
            width: 200px;
            height: 30px;
        }

        .post-content {
            margin-top: 20px;
        }

        .post-content textarea {
            width: 500px;
            resize: none;
        }

        .postBox .postBtn {
            width: 140px;
            height: 40px;
            background-color: rgb(7, 153, 14);
            color: #fff;
            border: none;
            margin-top: 15px;
            border-radius: 3px;
            cursor: pointer;
        }
    </style>

</head>

<body>
    <div class="box">
        <button class="passBtn">我要发贴</button>
        <hr>
        <ul class="list">


        </ul>



        <div class="postBox">
            <input type="text" placeholder="请输入标题" class="txt">
            <div class="ssbk">
                所属版块：
                <select name="" id="selPlate">
                    <option>请选择版块</option>
                    <option>电子书籍</option>
                    <option>新课来了</option>
                    <option>新手报到</option>
                </select>
                <div class="post-content">
                    <textarea name="" id="" cols="30" rows="10"></textarea>
                </div>
                <button class="postBtn">发布</button>
            </div>
        </div>

    </div>


    <script>
        let passBtn = document.querySelector('.passBtn')
        let postBox = document.querySelector('.postBox')
        let postBtn = document.querySelector('.postBtn')

        let list = document.querySelector('.list');
        let arrImg = ['./photo/images/tou01.jpg', './photo/images/tou02.jpg', './photo/images/tou03.jpg',
            './photo/images/tou04.jpg'
        ]

        passBtn.onclick = function () {
            postBox.style.display = "block"
        }

        postBtn.onclick = function () {
            let newli = document.createElement('li');

            let newimg = document.createElement('img');
            let randomNum = Math.floor(Math.random() * 4)
            newimg.src = arrImg[randomNum];

            let myh2 = document.createElement('h2')
            let txt = document.querySelector('.txt')
            myh2.innerHTML = txt.value
            txt.value = ""

            let myh3 = document.createElement('h3');
            let myspan = document.createElement('span');
            myspan.className = 'plate'

            let selPlate = document.querySelector('#selPlate');
            myspan.innerHTML = "版块：" + selPlate.value;
            myh3.appendChild(myspan)

            let myp = document.createElement('p')
            let myspanTime = document.createElement('span');
            myspanTime.className = 'postTime'
            let now = new Date();
            let mytime = now.getFullYear() + '-' + (now.getMonth() + 1) + '-' + now.getDate()
            // myspanTime.innerHTML = "发表时间：" + now.toLocaleDateString();
            myspanTime.innerHTML = "发表时间：" + mytime;
            myp.appendChild(myspanTime)


            let summary = document.createElement('h4')
            let textArea = document.querySelector('textarea')
            summary.innerHTML = textArea.value


            newli.appendChild(newimg);
            newli.appendChild(myh2);
            newli.appendChild(myh3);
            newli.appendChild(summary);
            newli.appendChild(myp);

            console.log(list.firstChild);
            if (list.firstChild) {
                list.insertBefore(newli, list.firstChild)
            } else {
                list.appendChild(newli)
            }

            postBox.style.display = 'none'
        }
    </script>
</body>

</html>