在码代码的时候会发现，很多东西都是殊途同归的，方法千千万，能解决问题的都是好办法，不一定非要把代码写的特别高深，这样反而后来的人看不懂，维护根据头疼。

所以用最简单通俗的代码，更能利于后期的维护开发。

先来看看背景粒子动画效果预览图：

按钮点击粒子动画

<div class="button">  <div class="button-text">确认</div></div>

由于按钮是梯形的，之前代码在button选择器上面已经加了伪类来实现梯形了，所以我们只能再套一层元素（button-text）来实现粒子。

.button-text {  position: relative;  width: 100%;  border-radius: 4px;  border: none;  cursor: pointer;}.button-text:before, .button-text:after {  position: absolute;  content: ;  display: block;  width: 140%;  height: 100%;  left: -20%;  z-index: -1000;  background-repeat: no-repeat;}.button-text:before {  display: none;  top: -75%;  background-image:     radial-gradient(circle, #fff 20%, transparent 20%),     radial-gradient(circle, transparent 20%, #fff 20%, transparent 30%),     radial-gradient(circle, #fff 20%, transparent 20%),     radial-gradient(circle, #fff 20%, transparent 20%),     radial-gradient(circle, transparent 10%, #fff 15%, transparent 20%),     radial-gradient(circle, #fff 20%, transparent 20%),     radial-gradient(circle, #fff 20%, transparent 20%),     radial-gradient(circle, #fff 20%, transparent 20%),     radial-gradient(circle, #fff 20%, transparent 20%);  background-size:     10% 10%,     20% 20%,     15% 15%,     20% 20%,     18% 18%,     10% 10%,     15% 15%,     10% 10%,     18% 18%;}.button-text:after {  display: none;  bottom: -75%;  background-image:     radial-gradient(circle, #fff 20%, transparent 20%),     radial-gradient(circle, #fff 20%, transparent 20%),     radial-gradient(circle, transparent 10%, #fff 15%, transparent 20%),     radial-gradient(circle, #fff 20%, transparent 20%),     radial-gradient(circle, #fff 20%, transparent 20%),     radial-gradient(circle, #fff 20%, transparent 20%),     radial-gradient(circle, #fff 20%, transparent 20%);  background-size:     15% 15%,     20% 20%,     18% 18%,     20% 20%,     15% 15%,     10% 10%,     20% 20%;}.button-text:active {  transform: scale(0.9);}

在 button-text 的伪类元素上面，添加 background-image ,并用径向渐变 radial-gradient 画出多个圆作为粒子。

transform: scale(0.9) ，是鼠标点击时，缩放 button-text 元素。

大家应该都看到默认伪类元素是 display: none; 隐藏的。所有当我们点击时，需要添加一个选择器，让其显示出来，并执行动画。

js来监听点击事件，点击后添加 animate 选择器。

var animateButton = function(e) {  e.preventDefault;  e.target.classList.remove(animate);  e.target.classList.add(animate);  setTimeout(function(){    e.target.classList.remove(animate);  },700);};var classname = document.getElementsByClassName("button-text");for (var i = 0; i < classname.length; i++) {  classname[i].addEventListener(click, animateButton, false);}

然后我们添加CSS，开始动画

.button-text.animate:before {  display: block;  animation: topBubbles ease-in-out 0.75s forwards;}.button-text.animate:after {  display: block;  animation: bottomBubbles ease-in-out 0.75s forwards;}@keyframes topBubbles {  0% {    background-position:       5% 90%,       10% 90%,       10% 90%,       15% 90%,       25% 90%,       25% 90%,       40% 90%,       55% 90%,       70% 90%;  }  50% {    background-position:       0% 80%,       0% 20%,       10% 40%,       20% 0%,       30% 30%,       22% 50%,       50% 50%,       65% 20%,       90% 30%;  }  100% {    background-position:       0% 70%,       0% 10%,       10% 30%,       20% -10%,       30% 20%,       22% 40%,       50% 40%,       65% 10%,       90% 20%;    background-size:       0% 0%,       0% 0%,        0% 0%,        0% 0%,        0% 0%,        0% 0%;  }}@keyframes bottomBubbles {  0% {    background-position:       10% -10%,      30% 10%,      55% -10%,      70% -10%,      85% -10%,      70% -10%,      70% 0%;  }  50% {    background-position:       0% 80%,      20% 80%,      45% 60%,      60% 100%,      75% 70%,      95% 60%,      105% 0%;  }  100% {    background-position:       0% 90%,      20% 90%,      45% 70%,      60% 110%,      75% 80%,      95% 70%,      110% 10%;    background-size:       0% 0%,      0% 0%,      0% 0%,      0% 0%,      0% 0%,      0% 0%;  }}

我们通过 background-position 改变背景的位置，用 background-size 改变大小，来形成动画效果。

这样就形成按钮点击粒子动画效果了。

同理，我们可以在背景上面添加同样的粒子效果。代码基本可以copy。

背景粒子效果

.king:before {  position: absolute;  content: ;  display: block;  width: 100%;  height: 100%;  top: 0;  z-index: 1;  background-repeat: no-repeat;  opacity: 0.4;}.king:before {  background-image:     radial-gradient(circle, #fff 20%, transparent 20%),     radial-gradient(circle, transparent 20%, #fff 20%, transparent 30%),     radial-gradient(circle, #fff 20%, transparent 20%),     radial-gradient(circle, #fff 20%, transparent 20%),     radial-gradient(circle, transparent 10%, #fff 15%, transparent 20%),     radial-gradient(circle, #fff 20%, transparent 20%),     radial-gradient(circle, #fff 20%, transparent 20%),     radial-gradient(circle, #fff 20%, transparent 20%),     radial-gradient(circle, #fff 20%, transparent 20%);  background-size:     10% 10%,     12% 12%,     5% 5%,     12% 12%,     5% 5%,     10% 10%,     5% 5%,     10% 10%,     5% 5%;  display: block;  animation: topBubbles ease-in-out 3s forwards infinite;}

这里我们改变一下粒子的大小，和透明度，以及层次（z-index）。让其一开始就执行动画，并且循环执行（infinite）。动画执行效果，我们直接用上面按钮的效果（topBubbles）即可。

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持脚本之家。