js第五天-对象

news2024/11/8 6:34:21

object

        let obj = {
            uname: 'pink',
            age: 18,
            gender: 'w'
        }

增

对象名.属性=新值

这个和cpp不一样，可以在大括号外面新增属性

    <script>
        let obj = {
            uname: 'pink',
            age: 18,
            gender: 'w'
        }
        obj.hobby = 'football'
        console.log(obj);


    </script>

删

delete

        delete obj.gender

查

对象名.属性

打印

    <script>
        let students = [
            { name: '小明', age: 18, gender: '男', hometown: '河北省' },
            { name: '小红', age: 19, gender: '女', hometown: '河南省' },
            { name: '小刚', age: 17, gender: '男', hometown: '山西省' },
            { name: '小丽', age: 18, gender: '女', hometown: '山东省' }
        ]
        for (let i = 0; i <= students.length; i++) {
            console.log(i);


            console.log(students[i]);
            console.log(students[i].name);
            console.log(students[i].hometown);
        }

    </script>

打印学生信息表格

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        table {
            width: 600px;
            text-align: center;
        }

        table,
        th,
        td {
            border: 1px solid #ccc;
            border-collapse: collapse;
        }

        caption {
            font-size: 18px;
            margin-bottom: 10px;
            font-weight: 700;
        }

        tr {
            height: 40px;
            cursor: pointer;
        }

        table tr:nth-child(1) {
            background-color: #ddd;
        }

        table tr:not(:first-child):hover {
            background-color: pink;
        }
    </style>
</head>

<body>
    <h2>学生信息</h2>
    <p>将数据渲染到页面中...</p>

    <table>
        <caption>学生列表</caption>
        <tr>
            <th>序号</th>
            <th>姓名</th>
            <th>年龄</th>
            <th>性别</th>
            <th>家乡</th>
        </tr>
        <script>
            let students = [
                { name: '小明', age: 18, gender: '男', hometown: '河北省' },
                { name: '小红', age: 19, gender: '女', hometown: '河南省' },
                { name: '小刚', age: 17, gender: '男', hometown: '山西省' },
                { name: '小丽', age: 18, gender: '女', hometown: '山东省' }
            ]
            for (let i = 0; i <= students.length; i++) {
                document.write(`
                <tr>
                    <td>${i + 1}</td>
                    <td>${students[i].name}</td>
                    <td>${students[i].age}</td>
                    <td>${students[i].gender}</td>
                    <td>${students[i].hometown}</td>
                </tr>
               `)

            }
        </script>
    </table>
</body>

</html>