SVG 和 CSS3 实现一个超酷爱心 Like 按钮

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在现代网页中，我们经常可以在一些文章、视频和图片页面上找到”Like”按钮，并且通过点击该按钮来表示自己对该内容的喜欢或者不喜欢。大部分”Like”按钮是纯文本按钮或者图片按钮，如果你想让它们具有特别的动画特效，那么我们就需要用到CSS3或者JavaScript了。本文给大家带来一个带有爱心散列动画的Like按钮，主要采用了SVG和CSS3这两个技术。当你点亮Like按钮时，按钮的四周将会散发出多个五彩绚丽的爱心。

效果预览

代码实现

HTML代码

首先我们用SVG的Path路径绘制了一个爱心按钮：

<svg height="320" width="320" class="like" onclick="document.body.classList.toggle('liked')"><path class="path" d="M 160 145 c 15 -90 170 -20 0 90 m 0 -90 c -15 -90 -170 -20 0 90" fill="white"> 
svg>

同时定义了onclick事件，当点击这个爱心按钮时，CSS类将会在like和liked之间切换。

就下来就是定义爱心按钮点击后周围出现的元素，主要是一些五彩的小圆点和一些不同风格颜色的SVG小爱心，代码如下：

<div class="dot dot-1">div>
<div class="dot dot-2">div>
<div class="dot dot-3">div>
<div class="dot dot-4">div>
<div class="dot dot-5">div>
<div class="dot dot-6">div>
<div class="dot dot-7">div>
<div class="dot dot-8">div><svg height="40" width="40" viewBox="0 0 320 320" class="h h-1"><path class="path" d="M 160 145 c 15 -90 170 -20 0 90 m 0 -90 c -15 -90 -170 -20 0 90">svg>
<svg height="40" width="40" viewBox="0 0 320 320" class="h h-2"><path class="path" d="M 160 145 c 15 -90 170 -20 0 90 m 0 -90 c -15 -90 -170 -20 0 90">svg>
<svg height="40" width="40" viewBox="0 0 320 320" class="h h-3"><path class="path" d="M 160 145 c 15 -90 170 -20 0 90 m 0 -90 c -15 -90 -170 -20 0 90">svg>
<svg height="40" width="40" viewBox="0 0 320 320" class="h h-4"><path class="path" d="M 160 145 c 15 -90 170 -20 0 90 m 0 -90 c -15 -90 -170 -20 0 90">svg><svg height="40" width="40" viewBox="0 0 320 320" class="h h-5"><path class="path" d="M 160 145 c 15 -90 170 -20 0 90 m 0 -90 c -15 -90 -170 -20 0 90">svg>
<svg height="40" width="40" viewBox="0 0 320 320" class="h h-6"><path class="path" d="M 160 145 c 15 -90 170 -20 0 90 m 0 -90 c -15 -90 -170 -20 0 90">svg>
<svg height="40" width="40" viewBox="0 0 320 320" class="h h-7"><path class="path" d="M 160 145 c 15 -90 170 -20 0 90 m 0 -90 c -15 -90 -170 -20 0 90">svg>
<svg height="40" width="40" viewBox="0 0 320 320" class="h h-8"><path class="path" d="M 160 145 c 15 -90 170 -20 0 90 m 0 -90 c -15 -90 -170 -20 0 90">svg><svg height="110" width="110" viewBox="0 0 320 320" class="fly fly-1"><path class="path" d="M 160 145 c 15 -90 170 -20 0 90 m 0 -90 c -15 -90 -170 -20 0 90">svg>
<svg height="110" width="110" viewBox="0 0 320 320" class="fly fly-2"><path class="path" d="M 160 145 c 15 -90 170 -20 0 90 m 0 -90 c -15 -90 -170 -20 0 90">svg>

到这里为止，我们利用了HTML和SVG将Like爱心按钮以及点击后的动画元素全部绘制了出来。接下来就是添加相应CSS来实现动画效果了。

CSS代码

首先是SVG爱心按钮的CSS代码，这是点击前的默认样式：

svg.like {position: fixed;z-index: 10;top: calc(50vh - 160px);left: calc(50vw - 160px);border-radius: 100%;-webkit-transform: scale(0.3);transform: scale(0.3);-webkit-transform-origin: 50% 50%;transform-origin: 50% 50%;box-shadow: 0 0 250px rgba(0, 0, 0, 0.4);background: #212121;cursor: pointer;
}

然后点击按钮后，CSS类将会切换到liked，这时候按钮将会闪动一下，同时周围将会飞入许多五彩的小圆点和小爱心。闪动动画的代码如下：

body.liked svg.like {-webkit-animation: blink 1s forwards;animation: blink 1s forwards;
}
@-webkit-keyframes blink {10% {-webkit-transform: scale(0.42);transform: scale(0.42);background: #8815b7;}100% {background: #e01f4f;}
}@keyframes blink {10% {-webkit-transform: scale(0.42);transform: scale(0.42);background: #8815b7;}100% {background: #e01f4f;}
}

小圆点和小爱心飞入的动画代码如下：

body.liked svg.fly.fly-1 {-webkit-animation: fly-1 1s 0.1s;animation: fly-1 1s 0.1s;
}
body.liked svg.fly.fly-2 {-webkit-animation: fly-2 1s 0.1s;animation: fly-2 1s 0.1s;
}
@-webkit-keyframes fly-1 {25% {margin: -100px 0 0 100px;}75% {margin: 100px 0 0 -100px;z-index: 5;}100% {z-index: 11;}
}
@keyframes fly-1 {25% {margin: -100px 0 0 100px;}75% {margin: 100px 0 0 -100px;z-index: 5;}100% {z-index: 11;}
}
@-webkit-keyframes fly-2 {25% {margin: -100px 0 0 -100px;}75% {margin: 100px 0 0 100px;z-index: 5;}100% {z-index: 11;}
}
@keyframes fly-2 {25% {margin: -100px 0 0 -100px;}75% {margin: 100px 0 0 100px;z-index: 5;}100% {z-index: 11;}
}

最后我们把五彩小圆点和小爱心的CSS代码也贴出来：

div.dot {width: 12px;height: 12px;background: white;position: fixed;z-index: 9;border-radius: 100%;top: calc(50vh - 6px);left: calc(50vw - 6px);
}
div.dot:before {content: "";width: 8px;height: 8px;border-radius: 100%;top: -20px;left: 2px;position: absolute;background: white;
}
div.dot:after {content: "";width: 11px;height: 11px;border-radius: 100%;top: -160px;left: 2px;position: absolute;background: white;display: none;
}
body.liked div.dot {opacity: 0;-webkit-transform: translateY(-100px);transform: translateY(-100px);background: #00e5ff;transition: opacity 0.5s 1s, background 0.1s 0.2s, -webkit-transform 1s;transition: transform 1s, opacity 0.5s 1s, background 0.1s 0.2s;transition: transform 1s, opacity 0.5s 1s, background 0.1s 0.2s, -webkit-transform 1s;
}
body.liked div.dot:after {display: block;
}
body.liked div.dot.dot-2 {-webkit-transform: rotate(45deg) translateY(-100px);transform: rotate(45deg) translateY(-100px);
}
body.liked div.dot.dot-3 {-webkit-transform: rotate(90deg) translateY(-100px);transform: rotate(90deg) translateY(-100px);
}
body.liked div.dot.dot-4 {-webkit-transform: rotate(135deg) translateY(-100px);transform: rotate(135deg) translateY(-100px);
}
body.liked div.dot.dot-5 {-webkit-transform: rotate(180deg) translateY(-100px);transform: rotate(180deg) translateY(-100px);
}
body.liked div.dot.dot-6 {-webkit-transform: rotate(225deg) translateY(-100px);transform: rotate(225deg) translateY(-100px);
}
body.liked div.dot.dot-7 {-webkit-transform: rotate(270deg) translateY(-100px);transform: rotate(270deg) translateY(-100px);
}
body.liked div.dot.dot-8 {-webkit-transform: rotate(305deg) translateY(-100px);transform: rotate(305deg) translateY(-100px);
}

到这里，整个Like爱心按钮动画就完成了。文章最后也将源码献给大家。