javascript - 将鼠标悬停在标签类上更改不同元素中 img 的图像 src

Question

假设我有这样的东西:

<div class="right">
<article class="left_image">
<img src="images/coolestimageontheplanet.jpg" class="image_left">
</article>

然后我有一个 UL 列表:

    <ul class="LISTS">
      <li><a href="#link" target="_blank" class="hov5">Link 1</a></li>
       <!-- etc -->
    </ul>

我将在上面的标记方式中列出大约 10 个列表项。基于悬停类，我想交换与 class="image_left" 关联的图像源，如上所示。因此，将鼠标悬停在 class="hov5" 上，您将获得 hov5 图像。

Answer 1

您可以为 mouseover 和 mouseleave 添加事件监听器，然后相应地更改 image.src，就像这样

window.addEventListener('load', function() {
  function initImageHover(selector, displaySelector) {
    var imageContainer = document.querySelectorAll(displaySelector)[0],
      elements = document.querySelectorAll(selector);

    for (var i = 0, len = elements.length; i < len; i++) {
      createHover(elements[i], imageContainer, imageContainer.src);
    };
  }

  function createHover(that, targetElement, originalImage) {

    that.addEventListener('mouseover', function() {
      var src = that.getAttribute('data-src');
      if (src) {
        targetElement.src = src;
      }
    });
    that.addEventListener('mouseleave', function() {
      targetElement.src = originalImage;
    });
  }

  initImageHover('li > a', '.image_left');
});

<div class="right">
  <article class="left_image">
    <img src="images/coolestimageontheplanet.jpg" class="image_left">
  </article>

  <ul class="LISTS">
    <li><a href="#link" target="_blank" class="hov1">Link 1</a>
    </li>
    <li><a href="#link" target="_blank" class="hov2">Link 2</a>
    </li>
    <li><a href="#link" target="_blank" class="hov3">Link 3</a>
    </li>
    <li><a href="#link" target="_blank" class="hov4">Link 4</a>
    </li>
    <li><a href="#link" target="_blank" class="hov5">Link 5</a>
    </li>
    <li><a href="#link" target="_blank" class="hov6">Link 6</a>
    </li>
    <li><a href="#link" target="_blank" data-src="http://cdn.sstatic.net/stackoverflow/img/sprites.svg?v=a7723f5f7e59" class="hov7">Link 7</a>
    </li>
  </ul>