<img src="img/beer.png" alt="beer" /> <input type="image" src="img/beer.png" />
解决方法
<input type="image" src="img/beer.png" onsubmit="submit();" />
但您应该使用< button> -element,这样更灵活.它可以包含文本,图像或两者：
<button type="submit" name="beer" value="beer_btn_was_clicked"> Here's some optinal text <p> you can even put it in a paragraph! </p> And you don't even need JavaScript! <img src="img/beer.png" /> </button>
编辑(2016-02-12)
截至今天*,上述示例不被视为100％有效,因为< p> -elements不再允许在< button> -element中.
根据MDN HTML element reference,< button> -element中唯一允许的内容类别是所谓的Phrasing content：
Phrasing content defines the text and the mark-up it contains. Runs of phrasing content make up paragraphs.
Elements belonging to this category are
<abbr>,<audio>,<b>,<bdo>,<br>,<button>,<canvas>,<cite>,<code>,<command>,<datalist>,<dfn>,<em>,<embed>,<i>,<iframe>,<img>,<input>,<kbd>,<keygen>,<label>,<mark>,<math>,<meter>,<noscript>,<object>,<output>,<progress>,<q>,<ruby>,<samp>,<script>,<select>,<small>,<span>,<strong>,<sub>,<sup>,<svg>,<textarea>,<time>,<var>,<video>,<wbr>and plain text (not only consisting of white spaces characters).A few other elements belong to this category,but only if a specific condition is fulfilled:
<a>,if it contains only phrasing content<area>,if it is a descendant of a element<del>,if it contains only phrasing content<ins>,if it contains only phrasing content<link>,if the itemprop attribute is present<map>,if it contains only phrasing content<Meta>,if the itemprop attribute is present
*今天是我读到的,而不是在引入变更时
