onmouseover，显示大图

Question

当您将鼠标悬停在图像的较小版本上时，我试图显示该图像的较大版本。我目前有 4 个函数可以执行此操作，但想知道是否可以通过使用一个函数来完成。问题是，如果我只有一个功能，我不确定如何更改源路径。我的代码如下。

HTML：（出于测试目的，我只有第一张带有 showImage() 的图像）

<section>
        <article>
            <header>Mouse Over and Mouse Out Events</header>
            <img onmouseover="showImage()" onmouseout="hideImage()" id="one" src="images/small/catbread1.jpg" title="catbread1" alt="Cat with bread on face 1" /> <img onmouseover="bigImage2()" onmouseout="hideImage()" id="two" src="images/small/catbread2.jpg" alt="Cat with bread on face 2" />
            <img onmouseover="bigImage3()" onmouseout="hideImage()" id="three" src="images/small/catbread3.jpg" alt="Cat with bread on face 3" /> <img onmouseover="bigImage4()" onmouseout="hideImage()" id="four" src="images/small/catbread4.jpg" alt="Cat with bread on face 4" />
        </article>
        <article>
            <header>Cat Photos</header>
            <img id="full" src="" />
        </article>

Javascript:

function hideImage() {
    document.getElementById("full").src = "";
}

function bigImage1() {
    document.getElementById("full").src = "images/large/catbread1.jpg";
}

function bigImage2() {
    document.getElementById("full").src = "images/large/catbread2.jpg";
}

function bigImage3() {
    document.getElementById("full").src = "images/large/catbread3.jpg";
}

function bigImage4() {
    document.getElementById("full").src = "images/large/catbread4.jpg";
}

function showImage() {
    document.getElementById("full").src = "images/large/" + this.title + ".jpg";
}

Answer 1

为什么不试试简单的 CSS？

.badboy {
  background : url( http://g02.a.alicdn.com/kf/HTB16ENqIXXXXXaUXVXXq6xXFXXXp/1000-autumn-maples-font-b-fall-b-font-font-b-scenery-b-font-jigsaw-puzzle-casual.jpg);
width: 300px;
height : 150px;
  margin: 0 auto;
  display: block;
  transition : ease all .5s
}

.badboy:hover {
   background : url( http://media-cdn.tripadvisor.com/media/photo-s/01/48/61/6c/beautiful-scenery-around.jpg);
width: 400px;
height : 250px;
  }

<div>
<img class="badboy">
</div>

Answer 2

您似乎已将图像排列成 large/ 和 small/ 的平行层次结构 - 太棒了，它会让这一切变得简单，而且您几乎已经做到了showImage。我将使用一些 stock photos 构建此示例，以便它明显有效。

基本上你想做的是：

抓取鼠标悬停的图像
将其路径的 small/ 部分替换为 large/
将其分配给 full 元素

要获取鼠标悬停的图像，请在 onmouseover 事件期间将其传递给 showImage。触发事件的元素可用 this.

<img onmouseover="showImage(this)" onmouseout="hideImage()" src="https://static.pexels.com/photos/9413/animal-cute-kitten-cat-small.jpg" />

showImage接受参数，你可以用replace()做路径转换，然后按原样赋值给full。

function showImage(img) {
  var src = img.src;
  var largeSrc = src.replace('small', 'large');
  document.getElementById('full').src = largeSrc;
}

打开此片段以进行工作演示：

function hideImage() {
  document.getElementById("full").src = "";
}

function showImage(img) {
  var src = img.src;
  var largeSrc = src.replace('small', 'large');
  document.getElementById('full').src = largeSrc;
}

<article>
  <header>Mouse Over and Mouse Out Events</header>
  <img onmouseover="showImage(this)" onmouseout="hideImage()" src="https://static.pexels.com/photos/9413/animal-cute-kitten-cat-small.jpg" />
  <img onmouseover="showImage(this)" onmouseout="hideImage()" src="https://static.pexels.com/photos/13937/pexels-photo-13937-small.jpeg" />
  <img onmouseover="showImage(this)" onmouseout="hideImage()" src="https://static.pexels.com/photos/7517/animal-sitting-animals-inside-small.jpg" alt="Cat with bread on face 3" />
  <img onmouseover="showImage(this)" onmouseout="hideImage()" src="https://static.pexels.com/photos/254/pet-kitten-cat-lying-small.jpg" />
</article>
<article>
  <header>Cat Photos</header>
  <img id="full" />
</article>

onmouseover，显示大图

onmouseover, show large version of image

javascript

html

onmouseover