有一个用于此特定目的的 html 属性，称为 accept，但它几乎没有跨浏览器的支持.因为这里推荐服务器端验证.

There is an html attribute for this specific purpose called accept but it has little support across browsers. Because of this server side validation is recommended instead.

<input type="file" name="pic" id="pic" accept="image/gif, image/jpeg" />

如果您无法访问后端，请查看基于 Flash 的解决方案，例如 SWFUpload.

If you don't have access to the backend have a look at a flash based solution like SWFUpload.

在此处查看更多信息:文件输入接受"属性 - 是吗有用吗?