input type="button"和button区别-蒲公英云

input type="button"和button区别

转自 https://davidwalsh.name/html5-buttons

One of the things I love about CSS is how easy it is to make one element look like another. In the example above, the first element is an anchor, the second is a button and the third is an input. I’ve overridden the click behavior of all three so they do the same thing.

If all three elements look and behave the same, does it matter which one you use? In this article, I’ll explain the difference between anchors, inputs and buttons, and I’ll show you when to use each one.

Semantics

The question of which element to use boils down to semantics, which is using markup that reflects the meaning of the content. Using semantic HTML makes your content explicit, which gives you better browser compatibility, accessibility and SEO.

Anchors

Anchors (the <a> element) represent hyperlinks. What’s a hyperlink? A hyperlink is a resource a person can navigate to or download in a browser. If you want to allow your user to move to a new page or download a file, then use an anchor.

Inputs

An input (<input>) represents a data field. The type attribute tells the browser which type of data the input controls. There are five input types related to buttons.

<input type="submit">: This is the most common button input. It’s a button that, when clicked, submits a form.
<input type="image">: Like an <input type="submit">, this input submits a form. However, it also takes a src attribute and is displayed as an image.
<input type="file">: This control is used to upload files and is shown as a label and a button. There’s no good cross-browser way to style file inputs, so you’ll usually set itsdisplay to hidden and use a second button to trigger it.
<input type="reset">: This is a button that resets a form.
<input type="button">: This is a button with no default behavior. You can use to it add non-standard behavior to a form using JavaScript.

Buttons

The <button> element represents a button! Buttons do the same things as the inputs mentioned above. Buttons were introduced into HTML as an alternative to inputs that are much easier to style. Unlike inputs, a button’s label is determined by its content. This means you can nest elements within a button, such as images, paragraphs, or headers. Buttons can also contain ::before and ::after pseudo-elements.

Like an input, a button has a type attribute. This attribute can be set to submit, reset orbutton and does the same thing as the input’s type. By default, the type is submit. If you place a button in a form and don’t set its type, when it’s clicked it will submit that form! If you don’t want this behavior, set the type to button.

One nifty feature of inputs and buttons is they support the disabled attribute. This makes it easy to turn them on and off. Sadly, anchors don’t have this capability.

Which one?

So should you use an anchor, input or button? When you’re navigating the user to a page or resource, use an anchor. Otherwise, both inputs and buttons are valid. Personally, I prefer to use inputs for submitting and resetting forms and buttons for custom behavior because I think it makes the intent clearer. However, the element you use is entirely up to you. Go nuts!