js获取数据后动态的添加表格（1月17号作业） - 作业

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<!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>js获取数据后动态的添加表格</title>
    <style>
        table,td,th{
            border: 1px solid #666;

        }
        table{
            width: 500px;
            border-collapse: collapse;
            text-align: center;
        }
        table caption{
            font-size: 1.2em;
        }
        thead tr:nth-of-type(1){
            background-color: lawngreen;
        }
    </style>
</head>

<body>
    <table id="cart1">
        <caption>购物车1</caption>
        <!-- 注: 浏览器会自动给以下内容添加一个tbody容器 -->
        <!-- 为防止作用js获取元素出错,我们手工添加上这个tbody -->
        <!-- 将表头手工加上thead,否则会被添加二个tbody,因为table允许使用多个tbody -->
        <thead>
            <tr>
                <th>编号</th>
                <th>品名</th>
                <th>数量</th>
                <th>单价</th>
            </tr>
        </thead>

        <tbody>
            <tr>
                <td>1</td>
                <td>手机</td>
                <td>1</td>
                <td>3000</td>
            </tr>
            <tr>
                <td>2</td>
                <td>电脑</td>
                <td>1</td>
                <td>5000</td>
            </tr>
            <tr>
                <td>3</td>
                <td>手机</td>
                <td>1</td>
                <td>3000</td>
            </tr>
        </tbody>
    </table>
    <button onclick="add()">动态添加</button>
    <button onclick="add2()">动态添加2</button>
</body>
<script>
    var data = [
            {id: 1, name: '牛奶', count: 3, price: 50},
            {id: 1, name: '苹果', count: 10, price: 80},
            {id: 1, name: '衣服', count: 2, price: 600}
        ];
    function add() {
        tbody = document.getElementsByTagName('tbody')[0];
        //第一种遍历数组的方法 forEach
        data.forEach(function(v,k) {
            var tr = document.createElement('tr');
            tr.innerHTML = "<td>"+v.id+"</td><td>"+v.name+"</td><td>"+v.count+"</td><td>"+v.price+"</td>";
            tbody.appendChild(tr);
            
        });
        
    }

    function add2() {
        tbody = document.getElementsByTagName('tbody')[0];
        //第二种遍历用for循环遍历data 再用forEach遍历键值
        for(i=0;i<data.length;i++){
            var tr = document.createElement('tr');
            Object.keys(data[i]).forEach(function(k) {
                tr.innerHTML += "<td>"+ data[i][k] + "</td>";
            });
            tbody.appendChild(tr);
        }

    }
</script>
</html>

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