join()方法就是将array数据中每个元素都转为字符串，用自定义的连接符分割

1、join('')将数组元素无缝拼接

<script>
        let s = Array('a','p','p','l','e')
        document.write(s.join(''))
 </script>

输出结果:apple

2、join(' ') 将数组元素以空格分割

    <script>
        let s = Array('Apple','is','on','my','table')
        document.write(s.join(' '))
    </script>

输出结果:Apple is on my table

3、join()将数组每个元素都转为字符串，用法等同于toString()

    <script>
        let s = Array(1,2,3)
        console.log(s)
        console.log(s.join())
    </script>

 4、join()将数组转换为页面元素的内容

<!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>
</head>
<body>
     <ul id="list"></ul>
     <script>
        let data = ['第一个','第二个','第三个','第四个']
        let list = document.querySelector('#list')
        let content = '<li>' + data.join('</li><li>') + '</li>'
        list.innerHTML = content
     </script>
</body>
</html>

 案例代码

<!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>
    <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/3.4.1/css/bootstrap.min.css" integrity="sha384-HSMxcRTRxnN+Bdg0JdbxYKrThecOKuH5zCYotlSAcp1+c8xmyTe9GYg1l9a69psu" crossorigin="anonymous">
    <script src="https://cdn.bootcdn.net/ajax/libs/jquery/3.6.0/jquery.min.js"></script>
</head>
<body style="padding: 20px;">
<table class="table table-bordered table-hover">
        <thead>
            <tr>
                <th>id</th>
                <th>书名</th>
                <th>作者</th>
                <th>出版社</th>
                <th>操作</th>
            </tr>
        </thead>
        <tbody id="tb">
          <tr>
            <td></td>
            <td></td>
            <td></td>
            <td></td>
            <td></td>
          </tr>
        </tbody>
    </table>
    
    <script>
      let tb = document.querySelector('#tb')
      data = [
        {id:1, bookname:'红楼梦', author:'曹雪芹', publisher:'河南出版社'},
        {id:2, bookname:'活着', author:'余华', publisher:'海南出版社'},
        {id:3, bookname:'我与地坛', author:'史铁生', publisher:'湖南出版社'}
      ]
      let content = []
      for(i = 0; i < data.length; i++){
       content.push('<tr><td>'+data[i].id+'</td><td>'+data[i].bookname+'</td><td>'+data[i].author+'</td><td>'+data[i].publisher+'</td><td><a href="javascript:;">删除</a></td></tr>')
       tb.innerHTML = content.join('')
      }
    </script>  
</body>
</html>
</html>

 

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