CSS - using one background image with multiple ima

问题:

I've observed that often the websites use only one background image which contains multiple images on it. For example, instead of using separately icons, all of the icons are put on one image and then the different parts of image are used in different section.

• Is there any advantage to this?
• How can this be used?

For example, for the following Stack Overflow sprite, how would I display just one of the images?

回答1:

The technique is called CSS Sprites. Basically you use CSS's background-position property and fixed height or width for your element.

If your elemnts are fixed width and fixed height at the same time you can freely create a more compact image. See this site for more complex examples.

回答2:

You are talking about CSS sprites, in which the background position changes on hover. Learn more here:

http://css-tricks.com/css-sprites/

回答3:

Change the css property background-position.

回答4:

yes , using sprites is good for website performs because every single component on website send different http request .So, when we use sprites images the http request become less & website performance increase.That rule is also apply on css also less css files less http request. you can yourself with the help of safari web inspector.

for more better performance download "yslow"

回答5:

And with CSS sprites is also possible to make e.g. menu button hover effect without waiting until second image loads. see

回答6:

It has the advantage that only one image needs to be loaded so that things like hover (roll-over) effects are faster. The technique is usually called "CSS sprites". Google for it.

回答7:

It has been common for a while to put two images on one sprite sheet, but the tendency has been moving towards combining ALL of your background images on the same sprite sheet to load just one file for all of them. There's a rather good tutorial here.