<input type="image"> 标签是一个图片提交按钮。 你必须使用 src 属性来定义图片的源，并且使用alt来定义当图片无法显示的时候的替代文字。 height 和width属性是用来定义图片的高和宽的。
This element includes the global attributes.
- The URI of a program that processes the information submitted by the input element, here image if specified, it overrides the
actionattribute of the element's form owner.
- If the input element is an image, this attribute specifies the type of content that is used to submit the form to the server. Possible values are:
application/x-www-form-urlencoded: The default value if the attribute is not specified.
multipart/form-data: Use this value if you are using an
<input>element with the
typeattribute set to
If this attribute is specified, it overrides the
enctypeattribute of the element's form owner.
- In image input element, this attribute specifies the HTTP method that the browser uses to submit the form. Possible values are:
post: The data from the form is included in the body of the form and is sent to the server.
get: The data from the form is appended to the form attribute URI, with a '?' as a separator, and the resulting URI is sent to the server. Use this method when the form has no side-effects and contains only ASCII characters.
If specified, this attribute overrides the
methodattribute of the element's form owner.
- This Boolean attribute specifies that the form is not to be validated when it is submitted. If this attribute is specified, it overrides the
novalidateattribute of the element's form owner.
- This attribute is a name or keyword indicating where to display the response that is received after submitting the form. This is a name of, or keyword for, a browsing context (for example, tab, window, or inline frame). If this attribute is specified, it overrides the
targetattribute of the element's form owner. The following keywords have special meanings:
self: Load the response into the same browsing context as the current one. This value is the default if the attribute is not specified.
_blank: Load the response into a new unnamed browsing context.
_parent: Load the response into the parent browsing context of the current one. If there is no parent, this option behaves the same way as
_top: Load the response into the top-level browsing context (that is, the browsing context that is an ancestor of the current one, and has no parent). If there is no parent, this option behaves the same way as
- This attribute defines the height of the image displayed for the button.
- This attribute specifies that the user must fill in a value before submitting a form but it cannot be used when the type attribute is
:requiredCSS pseudo-classes will be applied to the field as appropriate.
- This attribute specifies a URI for the location of an image to display on the graphical submit button; otherwise it is ignored.
usemapHTML 4 only, 已废弃 HTML5
- The name of a
<map>element as an image map.
- This attribute defines the width of the image displayed for the button.
<input type="image" name="image" src="/files/2917/fxlogo.png" width="50">