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位于沙洲村的“半条被子的温暖”专题陈列馆内，讲解员在为游客讲解历史。 朱桂花摄 1934年11月，红军长征路过湖南郴州市汝城县文明瑶族乡沙洲瑶族村，3位红军女战士在村民徐解秀家借宿。临走时，她们把仅有的一条被子剪下一半留下。从此，“半条被子”的故事流传至今。近日，记者走进沙洲村，恰逢当地正在举行郴州市纪念红军长征胜利90周年健步走活动。 汇入人流，踏上游步道，走过产业路。这一走，就走出了沙洲村。在相邻的文市村，瑶寨山墙上“等你在沙洲”的标语被鲜花簇拥。沙洲的名字，怎么挂到文市村来了？ “现在，大家都说‘大沙洲’了。”文市村村干部罗凯明笑着答道。2023年
Let's jump straight in!
Coupled with a touch of JavaScript, CSS animations and transitions are able to accomplish hardware-accelerated animations and interactions more efficiently than most JavaScript libraries. Let's jump straight in!
Web designers sometimes believe that animating in CSS is more difficult than animating in JavaScript. While CSS animation does have some limitations, most of the time it's more capable than we give it credit for! Not to mention, typically more performant.
Manipulating CSS Transitions
There are countless questions on coding forums related to triggering and pausing an element's transition. The solution is actually quite simple using JavaScript.
To trigger an element's transition, toggle a class name on that element that triggers it.
To pause an element's transition, use getComputedStyle and getPropertyValue at the point in the transition you want to pause it. Then set those CSS properties of that element equal to those values you just got.
Using CSS “Callback Functions”
Some of the most useful yet little-known JavaScript tricks for manipulating CSS transitions and animations are the DOM events they fire. Like: animationend, animationstart, and animationiteration for animations and transitionend for transitions. You might guess what they do. These animation events fire when the animation on an element ends, starts, or completes one iteration, respectively.
These events need to be vendor prefixed at this time, so in this demo, we use a function developed by Craig Buckler called PrefixedEvent, which has the parameters element, type, and callback to help make these events cross-browser. Here is his useful article on capturing CSS animations with JavaScript. And here is another one determining which animation (name) the event is firing for.
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Like we just learned, we can watch elements and react to animation-related events: animationStart, animationIteration, and animationEnd. But what happens if you want to change the CSS animation mid-animation? This requires a bit of trickery!
The animation-play-state Property
The animation-play-state property of CSS is incredibly helpful when you simply need to pause an animation and potentially continue it later. You can change that CSS through JavaScript like this (mind your prefixes):
element.style.webkitAnimationPlayState = "paused";
element.style.想了解更多高品質ながらも手の届きやすい価格設定相关内容，尽在完美对战平台munuohao。 = "running";
Obtaining the Current Keyvalue Percentage
Unfortunately, at this time, there is no way to get the exact current “percentage completed” of a CSS keyframe animation. The best method to approximate it is using a setInterval function that iterates 100 times during the animation, which is essentially: the animation duration in ms / 100. For example, if the animation is 4 seconds long, then the setInterval needs to run every 40 milliseconds (4000/100).
var showPercent = window.setInterval(function() {
if (currentPercent < 100) {
currentPercent += 1;
} else {
currentPercent = 0;
}
// Updates a div that displays the current percent
result.innerHTML = currentPercent;
}, 40);
Use Your Head
Before starting to code, thinking about and planning how a transition or animation should run is the best way to minimize your problems and get the effect you desire. Even better than Googling for solutions later! The techniques and tricks overviewed in this article may not always be the best way to create the animation your project calls for.
Here's a little example of where getting clever with HTML and CSS alone can solve a problem where you might have thought to go to JavaScript.
In Conclusion
- Developers used to need to choose between CSS and JavaScript.
- In JavaScript, CSS transitions are generally easier to work with than CSS animations.
- CSS Matrices are generally a pain to deal with, especially for beginners.
- Thinking about what should be done and planning how to do it.