Html HTML5 <img> 标签替代图片
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HTML5 <img> tag alternative image
提问by Hammad Ahmed
I was just wondering that in the html img tag
我只是想知道在 html img 标签中
<img alt = "default image" src = "image">is it possible to have a alternate image rather than just text. Or if is it possible to nest the img tag in the alt ""s.
<img alt = "default image" src = "image">是否可以有替代图像而不仅仅是文本。或者是否可以在 alt "" 中嵌套 img 标签。
回答by j08691
No, you can't put another image in the alt attribute of an <img>. You can however use the onerror event to load another image using JavaScript, so if the original image doesn't load, a backup can be loaded.
不，您不能在 .alt 属性中放置另一个图像<img>。但是，您可以使用 onerror 事件使用 JavaScript 加载另一个图像，因此如果原始图像未加载，则可以加载备份。
function standby() {
document.getElementById('foo').src = 'https://www.google.com/images/srpr/logo11w.png'
}<img id="foo" src="notfound.gif" onerror="standby()">回答by Moz
As far as I know, the alt attribute is supposed to have only text, since it is helpful for screen readers to "read" images.
据我所知， alt 属性应该只有文本，因为它有助于屏幕阅读器“阅读”图像。
If what you are searching for is a alternate image when the main one fails, you can do so with some JavaScript.
如果您要搜索的是主图像失败时的备用图像，则可以使用一些 JavaScript 来实现。
On this question you can see how to use the onError usage:
在这个问题上你可以看到如何使用 onError 用法：
