使用网页动画应用接口（Web Animation API）同步动画时钟

Synching Animation Clocks with the Web Animation API Web Animation API是W3C制定的网页动画标准，详见： http://w3c.github.io/web-animations/ 用来统一CSS3/SVG（SMIL）的动画操作。 Source: http://www.smashingmagazine.com/?p=210830 Read more: http://rachelnabors.com/waapi/

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HTML
CSS
JavaScript
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编译

JavaScript

// Here we set up a keyframes object containing values set in an '@keyframes' CSS rule
var keyframes = [{
    backgroundPosition: "-800px 0"
}, {
    backgroundPosition: "-800px -2591px"
}];
// and a timing object, which contains values we'd normally put in the 'animation' CSS rule
var timing = {
    duration: 750,
    iterations: Infinity,
    easing: "steps(13, end)"
};

/* with the WAAPI's animate function, we apply both keyframes and timing objects to .cat#withWAAPI 
(Have a look in your DOM inspector!)*/
var catRunning = document.getElementById("withWAAPI").animate(keyframes, timing);

/* A function that makes new cats! 
Goodie! This will be useful below. */
function addCat() {
    var newCat = document.createElement("div");
    newCat.classList.add("cat");
    return newCat;
}

/* This is the function that adds a cat to the CSS column */
function animateNewCatWithCSS() {
    // make a new cat
    var newCat = addCat();
    // Add the CSS class that kicks off the CSS animation
    newCat.classList.add("withCSS");
    CSSCats.appendChild(newCat);
}

/* This is the function that adds a cat to the WAAPI column */
function animateNewCatWithWAAPI() {
    // make a new cat
    var newCat = addCat();
    // animate said cat with the WAAPI's "animate" function
    var newAnimationPlayer = newCat.animate(keyframes, timing);
    // set that player object's start time to be the same as the original .cat#withWAAPI
    newAnimationPlayer.startTime = catRunning.startTime;
    WAAPICats.appendChild(newCat);
}

编译

CSS

/* All cats have the same dimensions and the same sprite for a background image. */
/* More information on this spriting technique in my 24 Ways article: 
http://24ways.org/2012/flashless-animation/ 
*/
/* It's all presentational from here on. 
   Nothing to see here! */

.cat {
    background: url(http://stash.rachelnabors.com/24ways2012/cat_sprite.png) -800px 0 no-repeat;
    /* The cats animated with CSS have their running animations set with CSS */
    
    height: 200px;
    width: 400px;
}
.cat.withCSS {
    animation: run-cycle;
    animation-duration: 0.75s;
    /* The keyframes for the run cycle.
   This moves the background image sprite around. */
    
    animation-timing-function: steps(13, end);
    animation-iteration-count: infinite;
}
@keyframes run-cycle {
    0% {
        background-position: -800px 0;
    }
    100% {
        background-position: -800px -2591px;
    }
}
#CSSCats,
#WAAPICats {
    display: inline-block;
    text-align: center;
    vertical-align: top;
    width: 400px;
}
@media only screen and (min-width: 850px) {
    #CSSCats,
    #WAAPICats {
        margin: 3em 1em;
    }
}
#CSSCats p,
#WAAPICats p {
    text-align: left;
}
body {
    background: #e5e6e9;
    color: #071933;
    font-family: 'Lato', sans-serif;
    font-size: 1em;
    line-height: 1.5em;
    margin: 1em 1em;
    text-align: center;
    width: 100%;
}
@media only screen and (min-width: 850px) {
    body {
        margin: 4em auto;
        width: 80%;
    }
}
h1 {
    font-family: 'Aleo', sans-serif;
    font-weight: 200;
    font-size: 2em;
    line-height: 1.25em;
}
h2 {
    font-family: 'Aleo', sans-serif;
    font-weight: 400;
    font-size: 1.5em;
    line-height: 1.25em;
}
p {
    margin: 0.5em 0;
}
button {
    background: #2d0d3c;
    border: 0;
    color: #f7e6ff;
    cursor: pointer;
    font-size: 0.9em;
    padding: 0.7em 2em;
}
@media only screen and (min-width: 850px) {
    button {
        padding: 1em 3em;
        font-size: 1em;
    }
}
code {
    font-family: monospace;
}
a:link {
    color: #1954c0;
}
a:visited {
    color: #702096;
}
a:hover,
a:active,
a:focus {
    color: #646d97;
}

HTML

Synching Animation Clocks with the Web Animation API Web Animation API是W3C制定的网页动画标准，详见： http://w3c.github.io/web-animations/ 用来统一CSS3/SVG（SMIL）的动画操作。 Source: http://www.smashingmagazine.com/?p=210830 Read more: http://rachelnabors.com/waapi/

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Synching Animation Clocks with the Web Animation API Web Animation API是W3C制定的网页动画标准，详见： http://w3c.github.io/web-animations/ 用来统一CSS3/SVG（SMIL）的动画操作。 Source: http://www.smashingmagazine.com/?p=210830 Read more: http://rachelnabors.com/waapi/

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