JS实现简易留言板的增删功能

小灰灰 2021-12-03 13:55 290阅读 0赞

\#\# \*\*JS实现简易留言板的增删功能\*\*  
一个很简单的留言板，实现\*\*增删\*\*功能，因为没有数据库，所以只是一个静态的留言板功能。  
\*\*修改\*\*功能其实也可以添加，但是我现在技术不够，等以后可能会添加\*\*修改\*\*功能。  
代码很简单，注释很清楚。\`\`\`

<!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 type="text/css">
            * {
                margin: 0;
                padding: 0;
                list-style: none;
            }
    
            .cle:after {
                height: 0;
                clear: both;
                visibility: hidden;
                display: none;
                content: "";
            }
    
            .bbslist {
                width: 400px;
                margin: 10px auto;
                border-radius: 5px;
                background: #A6A6A6;
                border: 1px solid #a6a6a6;
            }
    
            .bbslist>ul {
                margin: 8px 10px 10px 10px;
                display: block;
                clear: both;
                text-align: center;
                box-shadow: 3px 3px 25px #A6A6A6;
            }
    
            .bbslist>ul>li {
                background: #f4f4f4;
                margin: 10px 0;
                line-height: 30px;
                height: 30px;
                border-radius: 5px;
                text-align: center;
                box-shadow: 3px 3px 17px #A6A6A6;
                padding: 0 5px;
                font-size: 12px;
                border: 1px solid #a6a6a6;
                position: relative;
                transition: all 0.5s;
                animation: liBg 0.3s;
                overflow: hidden;
            }
    
            @keyframes liBg {
                from {
                    background: #442222;
                    opacity: 0;
                    left: -20px;
                    height: 0;
                }
    
                to {
                    background: #f4f4f4;
                    opacity: 1;
                    left: 0;
                    height: 30px;
                }
            }
    
            .mesDiv {
                width: 400px;
                background: #eee;
                height: 130px;
                border: 1px solid #a6a6a6;
                margin: 20px auto;
                border-radius: 5px;
                box-shadow: 3px 3px 17px #A6A6A6;
                animation: msgHeight 0.5s;
                overflow: hidden;
            }
    
            @keyframes msgHeight {
                from {
                    height: 0;
                    margin-top: 50px;
                    opacity: 0;
                }
    
                to {
                    height: 130px;
                    margin-top: 20px;
                    opacity: 1;
                }
            }
    
            .inputSty {
                width: 90%;
                height: 30px;
                display: block;
                color: #666;
                border: 1px solid #ddd;
                padding-left: 5px;
                line-height: 30px;
                font-size: 12px;
                clear: both;
                margin: 10px auto;
                border-radius: 5px;
            }
    
            .btnSty {
                width: 30%;
                height: 25px;
                margin: 0 auto;
                display: block;
                cursor: pointer;
                transition: all 0.2s;
                border-radius: 5px;
                box-shadow: 3px 3px 10px #A6A6A6;
            }
    
            .btnSty:hover {
                width: 20%;
                height: 30px;
                border-radius: 5px;
                box-shadow: 3px 3px 10px #A6A6A6;
            }
    
            .userSty {
                width: 25%;
                height: 25px;
                margin: 8px 18px 3px 18px;
                border-radius: 5px;
                box-shadow: 3px 3px 10px #A6A6A6;
            }
    
            .dd {
                width: 135px;
                height: 10px;
                position: relative;
                top: -10px;
                font-size: 8px;
                float: right;
                clear: both;
            }
            
            .delbtn{
                width: 35px;
                height: 22px;
                border-radius: 5px;
                position: relative;
                top: 5px;
                right: -4px;
                float: right;
                z-index: 2;
                color: red;
                /* box-shadow: 2px 2px 3px  #A6A6A6; */
            }
        </style>
    </head>
    
    <body>
        <div class="mesDiv">
            <input id="userId" class="userSty" type="button" value="您的姓名">
            <input id="msgId" class="inputSty" type="text" placeholder="">
            <input id="btnId" class="btnSty" type="button" value="提交留言">
        </div>
    
        <div class="bbslist cle" id="masMan">
            <ul id="ulId">
                <li>— — — 留言列表 — — —</li>
            </ul>
        </div>
        <script type="text/javascript">
            //定义一个函数用来重复获取gId("value"),中value的ID属性
            function gId(n) {
                return document.getElementById(n);
            }
            //获取姓名
            gId("userId").onclick = function () {
                var username = prompt("请输入您的姓名:");
                alert("您好！" + username + "。");
                gId("userId").value = username + "的留言：";
            } 
            //删除留言
            function delMsg(d) {
                var parentUl = d.parentNode;
                var parentDiv = parentUl.parentNode;
                parentDiv.removeChild(parentUl);
            }
            //提交留言
            gId('btnId').onclick = function () {
                //获取时间
                var today = new Date();
                var year = today.getFullYear();
                var month = today.getMonth() + 1;
                var day = today.getDate();
                var hours = today.getHours();
                var min = today.getMinutes();
                var second = today.getSeconds();
                var time = year + "年" + month + "月" + day + "日" + " " + hours + "时" + min + "分" + second + "秒";
                // var v = ;
                if (gId('msgId').value === '') {
                    alert("留言不能为空");
                    return false;
                }
                //创建li
                else {
                    //创建一个新元素ul
                    var ulcrate = document.createElement('ul');
                    //创建新元素li
                    var licrate = document.createElement('li');
                    //创建一个时间盒子
                    var divcrate = document.createElement('div');
                    //创建一个删除按钮
                    var delbtn = document.createElement('input');
                    //给删除按钮赋属性
                    delbtn.setAttribute('type', 'button');
                    delbtn.setAttribute('class', 'delbtn');
                    delbtn.setAttribute('value', '删除');
                    delbtn.setAttribute('onclick', 'delMsg(this)');
                    //给创建的ul赋属性
                    ulcrate.setAttribute('id', 'ulId');
                    
                    //给时间盒子设置属性
                    // divcrate.setAttribute('class', 'dd');
                    divcrate.className = "dd";
                    //向li里添加在输入框中获取的值
                    licrate.innerHTML = gId('msgId').value;
                    
                    
                    //把，删除按钮，留言内容，时间盒子添加到创建的ul里
                    ulcrate.appendChild(delbtn);
                    ulcrate.appendChild(licrate);   
                    ulcrate.appendChild(divcrate);
                    //给时间盒子传递时间
                    divcrate.innerHTML = time;
                    //把创建的ul添加到最外层的div里
                    gId('masMan').appendChild(ulcrate);
                    //留言内容初始化
                    gId("msgId").value = "";
                }
            }
        </script>
    </body>
    </html>