原生JS输入姓名科目分数添加到表格，可删除-526互联

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        div {
            text-align: center;
            box-sizing: border-box;
            width: 100%;
        }
        #div1 {
            margin-left: 300px;
            width: 800px;
            margin-top: 50px;
        }
        #div1 input {
            margin: 10px 0;
        }
        #div2 {
            margin-left: 300px;
            width: 800px;
        }
        table{
            width: 500px;
            margin: 100px auto;
            border-collapse: collapse;
            text-align: center;
        }
        td,th{
            border:1px solid #333;
        }
        thead tr{
            height: 40px;
            background-color: #ccc;
        }
    </style>
 </head>
 <body>
    <div id="div0">
        <div id="div1">
            姓名<input id="name" /><br>
            科目<input id="subject" /><br>
            分数<input id="fraction" /><br>
            <input id="add" type="button" value="添加" onclick="add()" />
        </div>
        <div id="div2">
            <table id="tb" cellspacing="0">
                <thead>
                    <tr>
                        <th>姓名</th>
                        <th>科目</th>
                        <th>成绩</th>
                        <th>操作</th>
                    </tr> 
                </thead>
                <tbody></tbody>
            </table>
         </div>
     </div>
    <script>
        var datas = [{
            name:'张三',
            subject:'java',
            fraction:85
        },{
            name:'李四',
            subject:'java',
            fraction:99
        },{
            name:'刘五',
            subject:'java',
            fraction:92
        }]
        // 创建行到tbody
        var tbody=document.querySelector('tbody');
        for( var i=0;i<datas.length;i++){
            var tr=document.createElement('tr');
            tbody.appendChild(tr);
            for( var k in datas[i]){
                var td=document.createElement('td');
                td.innerHTML = datas[i][k] 
                tr.appendChild(td);
            }
            var td=document.createElement('td');
            td.innerHTML='<a onclick="deleteRow(this)" href="javascript:;">删除</a>';
            tr.append(td);
        }

        // 动态删除表格的行
        function deleteRow(node) {
            // 第一个 parentNode获取到当前td
            // 第二个 parentNode获取到tr
            // 第三个 parentNode获取到当前table
            var table = node.parentNode.parentNode.parentNode;
            var tr = node.parentNode.parentNode;
        
            table.removeChild(tr);
        }
 
        function add() {
            var name = document.getElementById("name").value;
            var subject = document.getElementById("subject").value;
            var fraction = document.getElementById("fraction").value;
            if ((name === "" || subject === "" || fraction === "") || (name === "" && subject === "" && fraction === "")) {
                alert("输入框内容不能为空")
            } else {
                var tab = document.getElementsByTagName("table")[0];
                tab.innerHTML+=
                    "<tr>\n" +
                    "<td>" + name + "</td>\n" +
                    "<td>" + subject + "</td>" +
                    "<td>" + fraction + "</td>" +
                    '<td><a onclick="deleteRow(this)" href="javascript:;">删除</a></td>' +
                    "</tr>"
            }
            var textInputs = document.getElementsByTagName('input');
            for (var i = 0; i < textInputs.length; i++) {
                if (textInputs[i].type === 'text') {
                    textInputs[i].value = '';
                }
            }
        }
     </script>
 </body>
 </html>