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js方法与属性对html元素的常用操作2019年1月18日 14时15分
文俊的博客
Original
585 people have browsed it

实例

主要操作:查找html标签:children[]  添加html标签:appendChild()  parentNode=>上一级html标签,removeChild()删除下一级标签 

firstElementChild :第一个子标签 

var first = ul.firstElementChild   ul.insertBefore(li, first)  在LI标签前添加一个LI标签;

<!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>
</head>

<body>
    <!---Tolist练习--->
    <h3>留言板</h3>

    <input type="text">

    <ul> </ul>


    <script>

        /*    属性
        children = > 获取全部的子元素
        childNodes = >
        childElementCount = >获取子节点数量
        keyCode = >获取按键值
        firstElementChild = >获取第一个子元素
        方法
        querySelector() = >获取满足条件的第一个元素
        appendChild() = >添加一个子节点
        insertBefore() = >在子节点前添加一个节点
        focus() 获取焦点
        */

        var comment = document.querySelector('input');

        var ul = document.getElementsByTagName('ul')[0];

        comment.focus();

        comment.onkeydown = function (a) {

            /*为什么这里的keyCode不能单独使用,非得传个参数给keyCode,如:keyCode === 13会报错*/
            if (a.keyCode === 13) {
                var li = document.createElement('li');

                li.innerHTML = comment.value + '<a href="javascript:;" onclick="del(this)">删除</a>';

                if (ul.childElementCount === 0) {

                    ul.appendChild(li);

                } else {
                    var first = ul.firstElementChild;
                    ul.insertBefore(li, first);

                }

                comment.value = '';

            }

        }
        function del(aabc) {
            if (confirm('确认删除吗?')) {      
                var li = aabc.parentNode;
                li.parentNode.removeChild(li);

            }

        }

    </script>


    <style>
        table,
        th,
        td {
            border: 1px solid lightcoral;
            border-collapse: collapse;
        }

        table {
            width: 400px;
            text-align: center;
        }

        thead {
            background-color: lightskyblue;
        }

        caption {
            font-size: 1.2rem;
            margin-bottom: 9px;
        }

        tbody {
            font-size: 10pt;
        }

        td {
            height: 30px;
        }

        th {
            height: 25px;
        }
    </style>
    <!---表格操作-->

    <table id='tab1'>
        <caption>表格一</caption>
        <thead>
            <tr>
                <th>编号</th>
                <th>品名</th>
                <th>数量</th>
                <th>价格</th>
                <th>总价</th>
            </tr>
        </thead>
        <tbody>
            <tr>
                <td>1</td>
                <td>手机</td>
                <td>1</td>
                <td>3000</td>
                <td>3000</td>
            </tr>
            <tr>
                <td>2</td>
                <td>电脑</td>
                <td>1</td>
                <td>5000</td>
                <td>5000</td>
            </tr>
            <tr>
                <td>3</td>
                <td>衣服</td>
                <td>1</td>
                <td>800</td>
                <td>800</td>
            </tr>
        </tbody>
    </table>

    <script>
        var table = document.getElementById('tab1');

        var tbody = table.children[2];
        var tr = table.children[2].children[0];



        tbody.parentNode.removeChild(tbody);




        var arr = [
            { 'id': 1, 'goods_name': '牛奶', 'count': 3, 'price': 15, 'count_price': 45 },
            { 'id': 2, 'goods_name': '面包', 'count': 5, 'price': 10, 'count_price': 50 },
        ];



        arr.forEach(function (value) {

            var tbody = document.createElement('tbody');
            var tr = document.createElement('tr');

            tr.innerHTML = '<td>' + value.id + '</td>';
            tr.innerHTML += '<td>' + value.goods_name + '</td>';
            tr.innerHTML += '<td>' + value.count + '</td>';
            tr.innerHTML += '<td>' + value.price + '</td>';
            tr.innerHTML += '<td>' + value.count*value.price + '</td>';

            tbody.appendChild(tr);

            table.appendChild(tbody);

        })


    </script>
</body>

</html>

运行实例 »

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Correction status:qualified

Teacher's comments:为什么这里的keyCode不能单独使用,非得传个参数给keyCode,如:keyCode === 13会报错、 keyCode的语法就是event.keyCode 如果你前面没有事件或者其他那肯定就会报错啊
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