javascript - 单击更改图标并通过 javascript 添加 css 类

Question

我正在尝试制作可扩展的 h3。为此，我将有一个“加号”图像可供单击，当它被单击时必须更改为“减号”图像，我需要向 h3 添加一个 css 类以显示内容。我将粘贴下面的所有代码:

<div class="default">
    [ManageBlog]
    <div class="msearch-result" id="LBSearchResult[moduleid]" style="display: none">
    </div>
    <div class="head">
        <h1 class="blogname">
                [BlogName] <img src="/portals/40/Images/Train_Fitness_2015_S/images/plus_symbol.png" alt="Plus Button" id="ExpandBlogDescriptionImg"></h1> [RssFeeds]
        <br style="line-height: 12px; clear: both" />
        <h3 class="blogdescription">
                [BlogDescription]</h3> [Author]
    </div>
    <br /> [Posts] [Pager]
</div>
<div style="clear: both"></div>

这是javascript:

jQuery(document).ready(function() {
     $("#ExpandBlogDescriptionImg").click(function() {
         var right = "https://train.fitness/portals/40/Images/Train_Fitness_2015_S/images/plus_symbol.png";
         var left = "https://train.fitness/portals/40/Images/Train_Fitness_2015_S/images/minus_symbol.png";
         element.src = element.bln ? right : left;
         element.bln = !element.bln;
     });
     var img = $("#ExpandBlogDescriptionImg");
     if (img.src = "https://train.fitness/portals/40/Images/Train_Fitness_2015_S/images/minus_symbol.png") {
         $('.blogdescription').addClass("ExpandBlogDescriptionText");
     } else {
         $('.blogdescription').removeClass("ExpandBlogDescriptionText");
     };
 });

Answer 1

你可以使用jquery的.attr函数来设置图片源

$('.img-selector').attr('src','plusorminusimagepath.jpg');

你可以有一个 bool 标志来知道它是少了还是多了