Remove the a label and button and add the background image dotted line/shadow perfect solution

When a user registers, they will click on a label to change the verification code. When clicked, there is a shadow part on the a label. But this is intolerable for students who like aesthetics!

What is the reason for this? It turns out that the href attribute of the a tag is to blame.

1. Just a tag

There are two solutions I know of.

First: prescribe the right medicine for the disease. Since it is caused by href. Then remove the href attribute

When we use href=javascript:RefreshCode(); we just update the verification code. No page jump.

Just modify it and you can perfectly remove it by adding onfocus="this.blur()" to the a tag.

certainly. If you want the a tag to not be underlined. Then: style="text-decoration: none"

In FF and other browsers, it is relatively easy. Just define the style outline:none for the tag a, that is:

Of course not. We can do this when the page loads. Get all the a tags on the page through: window.document.links.length (window can be omitted here). Then iterate over the registered events.

Another if you add a background image to the button. There will be shadows.

The same approach can also be used to achieve

3. If you add an a tag to img, then add onfocus to the a tag and set the border attribute of img: border=0

The commented-out sentence is to add onfucus = this.blur(); which has the same effect.
Then call fHideFocus("A"); to remove the dotted frame of a. You can remove different dotted frames by passing different parameters. For example, "BUTTON" can remove the dotted frame of button, but remember that the parameters must be capital letters.

Extensions:

A. How to remove the dotted lines of links within a map area?

This is a conceptual error. In fact, it should be controlled on the map image, not in the area. Refer to the traditional method

B. About onFocus

For the experts, the knowledge points are already very outdated. But for friends who have just come into contact with it, it is a timely relief, and I just happened to encounter it today. So it is recorded here. Knowledge must be accumulated bit by bit.