Question

我收到了一个＆＃34; myval：undefined＆＃34;以下代码的消息。我想知道如何获得当前班级的课程内容？

这是我的功能：

$(".row > div").each(function(i) {
            var myval = $(this).attr('class');
             console.log ("myval: " + myval)
});

HTML：

<div class="row">
 <div class="item1">item</div>
 <div class="item2">item</div>
</div>

<div class="row">
 <div class="item3">item</div>
 <div class="item4">item</div>
</div>

<div class="row">
 <div class="item5">item</div>
 <div class="item6">item</div>
</div>

etc.

Answer 1

我看不到您的代码有任何问题，请检查您是否正确包含了jQuery库。

此处示例： http://jsbin.com/rutameg/edit?html,js,console,output

$(".row > div").each( function() { // Removed i as not in use
            var myval = $(this).attr('class');
             console.log ("myval: " + myval)
});

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
</head>
<body>
  
  
  
  <div class="row">
 <div class="item1">item 1</div>
 <div class="item2">item 2</div>
</div>

<div class="row">
 <div class="item3">item 3</div>
 <div class="item4">item 4</div>
</div>

<div class="row">
 <div class="item5">item 5</div>
 <div class="item6">item 6</div>
<script src="https://code.jquery.com/jquery-3.1.0.js"></script>
</div>

</body>
</html>

Answer 2

您的代码是正确的，结果是预期的

＆＃13;

$(".row > div").each( function(i) { // Removed i as not in use
            var myval = $(this).attr('class');
             console.log ("myval: " + myval)
});

＆＃13;

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
</head>
<body>
  
  
  
  <div class="row">
 <div class="item1">item 1</div>
 <div class="item2">item 2</div>
</div>

<div class="row">
 <div class="item3">item 3</div>
 <div class="item4">item 4</div>
</div>

<div class="row">
 <div class="item5">item 5</div>
 <div class="item6">item 6</div>
<script src="https://code.jquery.com/jquery-3.1.0.js"></script>
</div>

</body>
</html>

＆＃13;

jquery每个函数 - ＆gt;类名是＆＃34;未定义＆＃34; for $（＆＃34; .row＆gt; div＆＃34;）。each（function（i）{};

2 个答案: