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开源软件名称：cameronmcefee/plax开源软件地址：https://github.com/cameronmcefee/plax开源编程语言：JavaScript 100.0%开源软件介绍：Plax is on the backburner and is provided as-is. I won't be adding bug fixes or future improvements at this time. Plax is old enough that there are better options available so go forth an parallax! PlaxPlax is a jQuery plugin that makes it suuuuuper easy to parallax elements in your site based on mouse position. You can see it implemented in many places throughout GitHub, including the 404 page, the 500 page, and the about page. I've also used a modified version to parallax a URL. DependenciesUsageIn the <head> of your document, link both jQuery and plax. <script type="text/javascript" src="/js/jquery.min.js"></script>
<script type="text/javascript" src="/js/plax.js"></script>Then in your javascript, add each "layer" to the list of layers to be parallaxed. Once that's done, enable Plax and you're good to go. $('#plax-octocat').plaxify({"xRange":40,"yRange":40})
$('#plax-earth').plaxify({"xRange":20,"yRange":20,"invert":true})
$('#plax-bg').plaxify({"xRange":10,"yRange":10,"invert":true})
$.plax.enable()Another way is to specify the arguments as data attributes on the layer elements. <img src="octocat.png" data-xrange="40" data-yrange="40">
<img src="earth.png" data-xrange="20" data-yrange="20">
<img src="bg.png" data-xrange="10" data-yrange="10" data-invert="true">Then plaxify them in bulk. $('img').plaxify()
$.plax.enable()If you would like your elements to parallax only when a certain element is moused over, you need to supply an argument to $.plax.enable({ "activityTarget": $('#myPlaxDiv')})You can dynamically redefine the range of a layer by running $('#plax-octocat').plaxify({"xRange":40,"yRange":40})
$('#plax-earth').plaxify({"xRange":20,"yRange":20,"invert":true})
$('#plax-bg').plaxify({"xRange":10,"yRange":10,"invert":true})
$.plax.enable()
$('#my-btn').click(function(){
// bigger range
$('#plax-octocat').plaxify({"xRange":200,"yRange":200})
})Documentationplaxify()Add an item to the list of parallaxing layers. Ranges are centered at the items start location. For example, an item with a 20px range will be able to move 10px forward and 10px backward from its start location. Parameters
* The same effect can be achieved by providing
enable()Enable parallaxing. Parameters
disable()Disable parallaxing. Parameters
Best Practices
How To Fake ItHere are a couple real-life examples of parallaxing and a quick description of how you might emulate it with Plax. Example #1Picture driving down the highway. There are three objects: You, in the inside lane, a truck in the outside lane, and a sign on the side of the road. As you drive past the truck, the sign always manages to stay just out of view behind the truck. The lessonIn this case, the truck becomes the "anchor", as it stays relatively still. It is the item upon which all the movement is based. If you were to recreate this scenario in your javascript, the truck would have a small range, say 10–20 pixels. That way, it would move a little, but not too much. Since the car you are in is moving faster relative to the truck it would need a larger range like 50–100 pixels. Finally, the sign, since it is "behind" the truck, will need to have Example #2Picture another driving scenario. You're the passenger in a car driving past a barn. In the distance you can see mountains. If you look at the grass on the side of the road, it seems to be flying by at blazing speed. If you look at the barn, it still appears to be passing by, but much more slowly than the grass. If you look to the mountains in the distance, they pretty much seem to be staying where they are at. The lesson The principals from the previous scenario are still present in this situation, only the anchor has moved to the back layer (the mountains). Since the mountains are far off in the distance and barely moving, they get a range of 5–10 pixels. Each layer as it comes forward should have a greater range than the layer before it. The barn would probably have 20–30 pixels of range and the grass near the road would probably have 100 pixels of range. 
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