Javascript第三个问不会写

/1.按照图片，实现网页布局。
2.页面打开，下面评论区域不显示内容。
3.在上面的输入框输入内容，点击提交评论按钮
输入的消息会在下方显示[内容时间等做好布局]
4.每条评论右侧的上和下的拇指图片后面数字初始化都是0
5.选作题
点击上或者下的图标
后面的数字加1
6.选作题：
点击删除图标或者文字，
当前这条评论删除/


<!DOCTYPE html>
<html>

<head>
    <meta charset="UTF-8">
    <title></title>
    <style type="text/css">
        body {
            /*background-image: url(../img/91R58PIC3n2_1024.jpg);*/
        }

        #div1 {
            margin: auto;
            border: 1px beige solid;
            width: 512px;
            text-align: right;
        }

        ul {
            list-style-type: none;
            list-style-image: url(../img/touxiang.png);

        }

        .box {
            width: 400px;
            height: 150px;
            /*background-color: yellow;*/
            border: 1px darkgray solid;
            border-radius: 30px;
            position: relative;
        }

        .box .touxiang {
            width: 80px;
            height: 80px;
            background-image: url(../img/touxiang.png);
            background-size: 100% 100%;
            position: absolute;
            left: 10px;
            top: 10px;
        }

        .box .nicheng {
            width: 80px;
            height: 25px;
            /*background-color: red;*/
            position: absolute;
            left: 10px;
            top: 100px;
            font-size: 12px;
            text-align: center;
            line-height: 25px;
        }

        .box .pinglun {
            width: 290px;
            height: 80px;
            /*background-color: cyan;*/
            position: absolute;
            top: 10px;
            right: 10px;
        }

        .box .shijian {
            width: 200px;
            height: 25px;
            /*background-color: green;*/
            position: absolute;
            top: 100px;
            left: 100px;
        }
    </style>

    <script>
        window.onload = function () {
            var oTxt = document.getElementById("txt");
            var oBtn = document.getElementById("btn1");
            var oUl1 = document.getElementById("ul1");


            oBtn.onclick = function () {
                var oBox = document.createElement("div");
                oBox.className = "box";

                //创建头像
                var oDiv = document.createElement("div");
                oDiv.className = "touxiang";
                oBox.appendChild(oDiv);

                var oDiv = document.createElement("div");
                oDiv.className = "nicheng";
                oDiv.innerHTML = "指尖微凉*";
                oBox.appendChild(oDiv);

                var oDiv = document.createElement("div");
                oDiv.className = "pinglun";
                oDiv.innerHTML = oTxt.value;
                oBox.appendChild(oDiv);

                var oDiv = document.createElement("div");
                oDiv.className = "shijian";
                var oDate = new Date();
                //oDate.getFullYear

                oDiv.innerHTML = "评论时间&nbsp;&nbsp;" + oDate.getFullYear() + "年" + (oDate.getMonth() + 1) + "月" + oDate.getDate() + "日" + "<a href='javascript:;'>删除</a>";




                oBox.appendChild(oDiv);

                oUl1.appendChild(oBox);

                /*oBox.insertBefore(oUl1,oDiv[0]);*/

                var aA = oDiv.getElementsByTagName("a");

                for (var i = 0; i < aA.length; i++) {
                    aA[i].onclick = function () {
                        oDiv.removeChild(this.parentNode);
                    }
                }

            }
        }

    </script>



    </script>
</head>

<body>
    <h2 align="center">网易云热评</h2>
    <div id="div1">
        <textarea cols="70" rows="8" id="txt"></textarea><br />
        <input type="button" value="评论" id="btn1" />

        <ul id="ul1">

        </ul>
    </div>
</body>

</html>

就是 js dpm元素的增删改查。你改一下样式即可