Question

我想在单击特定按钮时更改两个div的字体大小，但按钮单击没有响应，请帮助。我在一个选择器中使用两个div ID。还请让我知道错误在哪里，下面是我的代码。

<html>

<head>
<title>
Example 2
</title>

<style>

    body
    {
        margin:10px 2em;
    }
    .switcher
    {
        float:right;
        margin:10px;
        background-color:#ddd;
        border: 1px solid #000;
        padding : 10px;
        font-size:0.9em;
    }

    .large
    {
        font-size:2em;
    }

</style>

<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<script>
    $(document).ready(function{
        $('#switcher-large').on('click',function(){
            $('#header, #chapter-preface').addClass('large');
        });
    });
</script>
</head>

<body>
<div id="container">

      <div id="switcher" class="switcher">
        <h3>Style Switcher</h3>
        <button id="switcher-default">
          Default
        </button>
        <button id="switcher-narrow">
          Narrow Column
        </button>
        <button id="switcher-large">
          Large Print
        </button>
      </div>

      <div id="header">
        <h2>A Christmas Carol</h2>
        <h2 class="subtitle">In Prose, Being a Ghost Story of Christmas</h2>
        <div class="author">by Charles Dickens</div>
      </div>

      <div class="chapter" id="chapter-preface">
        <h3 class="chapter-title">Preface</h3>
        <p>I HAVE endeavoured in this Ghostly little book, to raise the Ghost of an Idea, which shall not put my readers out of humour with themselves, with each other, with the season, or with me.  May it haunt their houses pleasantly, and no one wish to lay it.</p>
        <p>Their faithful Friend and Servant,</p>
        <p>C. D.</p>
        <p>December, 1843.</p>
      </div>


</body>

</html>

Answer 1

您有语法错误

尝试替换

$(document).ready(function{

的

$(document).ready(function(){

Answer 2

试试这个

$('#header h2, #chapter-preface h3, #chapter-preface p').addClass('large');

单击按钮无法增加字体大小

2 个答案: