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JS对象-遍历数组对象

JS遍历对象数组
2023-06-13 09:18:28 时间

需求

请把下面数据中的对象打印出来： students = [ {uid: 1, name: ‘小明’, age: 18, gender: ‘男’, hometown: ‘河北省’ }, {uid: 2, name: ‘小红’, age: 19, gender: ‘女’, hometown: ‘河南省’ }, {uid: 3, name: ‘小刚’, age: 17, gender: ‘男’, hometown: ‘山西省’ }, {uid: 4, name: ‘小丽’, age: 18, gender: ‘女’, hometown: ‘山东省’ } ]

效果图

代码

方法一

<!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>
        *{
         padding:0;
         margin:0;
     }
     table{
         width:500px;
         margin:100px auto;
         border-collapse:collapse;/*边框合并模式*/
         text-align:center;
     }
     td,th{
         border:1px solid #333;
     }
     thead tr{
         height:40px;
         background-color: #cccccc;
     }
 </style>
</head>
<body>
    <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' }
        ]
        document.write(`
        <table>
        <caption>
            <h2> 学生列表</h2>
        </caption>
        <thead>
            <tr>
                <th>序号</th>
                <th>姓名</th>
                <th>年龄</th>
                <th>性别</th>
                <th>家乡</th>
            </tr>
        </thead>
`)
        for(i = 0; i < students.length ; i ++) {
            let a = students[i]
              document.write(`
                <tbody>
                    <tr>
                        <td>${i}</td>
                        <td>${a.name}</td>
                        <td>${a.age}</td>
                        <td>${a.gender}</td>
                        <td>${a.hometown}</td>
                    </tr>
                </tbody>
             `)
        }
    </script>
</body>

</html>

方法二

<!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>
           *{
            padding:0;
            margin:0;
        }
        table{
            width:500px;
            margin:100px auto;
            border-collapse:collapse;/*边框合并模式*/
            text-align:center;
        }
        td,th{
            border:1px solid #333;
        }
        thead tr{
            height:40px;
            background-color: #cccccc;
        }
    </style>
</head>
<body>

    <table>
        <caption>
            <h2> 学生列表</h2>
        </caption>
        <thead>
            <tr>
                <th>序号</th>
                <th>姓名</th>
                <th>年龄</th>
                <th>性别</th>
                <th>家乡</th>
            </tr>
        </thead>

        <tbody>
        </tbody>
    </table>
    <script>
        let students = [
            {uid: 1, name: '小明', age: 18, gender: '男', hometown: '河北省' },
            {uid: 2, name: '小红', age: 19, gender: '女', hometown: '河南省' },
            {uid: 3, name: '小刚', age: 17, gender: '男', hometown: '山西省' },
            {uid: 4, name: '小丽', age: 18, gender: '女', hometown: '山东省' }
        ]
       // 往tbody里面创建行，有几个人（通过数组的长度）我们就创建几行
        let tbody=document.querySelector("tbody");
        for (let i = 0; i < students.length; i++) {
            let tr = document.createElement("tr")
            tbody.appendChild(tr)
            //往tr每一行里面创建单元格（跟数据有关系的3个单元格），td单元格的数量取决于每个对象的属性个数 for循环遍历对象 students[i]
            for (let k in students[i]) {
               let td = document.createElement("td") // 创建单元格
               td.innerHTML = students[i][k] //把对象的属性给单元格
               tr.appendChild(td)
            }
        }
    </script>
 </body>
</html>

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