JavaScript实现表格的删除和增加

来源：尔游网
实现代码：
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>动态表格</title>
    <style>
        table {
            border: 1px solid;
            margin: auto;
            width: 500px;
        }

        td, th {
            text-align: center;
            border: 1px solid;
        }

        div {
            text-align: center;
            margin: 50px;
        }
    </style>
</head>
<body>

<div>
    <input type="text" id="id" placeholder="请输入编号">
    <input type="text" id="name" placeholder="请输入姓名">
    <input type="text" id="gender" placeholder="请输入性别">
    <input type="button" value="添加" id="btn_add">
</div>

<table>
    <caption>学生信息表</caption>
    <tr>
        <th>编号</th>
        <th>姓名</th>
        <th>性别</th>
        <th>操作</th>
    </tr>
    <tr>
        <td>1</td>
        <td>张三</td>
        <td>男</td>
        <td><a href="javascript:void(0);" onclick="delTr(this);">删除</a></td>
    </tr>
    <tr>
        <td>2</td>
        <td>李四</td>
        <td>男</td>
        <td><a href="javascript:void(0);" onclick="delTr(this);">删除</a></td>
    </tr>
    <tr>
        <td>3</td>
        <td>王五</td>
        <td>女</td>
        <td><a href="javascript:void(0);" onclick="delTr(this);">删除</a></td>
    </tr>

</table>
<script>
    document.getElementById("btn_add").onclick = function () {
        var id = document.getElementById("id").value;
        var name = document.getElementById("name").value;
        var gender = document.getElementById("gender").value;

        var td_id = document.createElement("td");
        var text_id = document.createTextNode(id);
        td_id.appendChild(text_id);

        var td_name = document.createElement("td");
        var text_name = document.createTextNode(name);
        td_name.appendChild(text_name);

        var td_gender = document.createElement("td");
        var text_gender = document.createTextNode(gender);
        td_gender.appendChild(text_gender);

        var td_a = document.createElement("td");
        var a = document.createElement("a");
        a.setAttribute("href", "javascript:void(0);")
        a.setAttribute("onclick", "delTr(this);");
        var text_a = document.createTextNode("删除");
        a.appendChild(text_a);
        td_a.appendChild(a);

        var tr = document.createElement("tr");
        tr.appendChild(td_id);
        tr.appendChild(td_name);
        tr.appendChild(td_gender);
        tr.appendChild(td_a);
        var tab = document.getElementsByTagName("table")[0];
        tab.appendChild(tr);
    }


    function delTr(obj) {
        var table = obj.parentNode.parentNode.parentNode;
        var tr = obj.parentNode.parentNode;
        table.removeChild(tr);
    }
</script>
</body>
</html>
效果图：
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