js实现红包雨 js+css实现红包雨效果

 <div class="hide">
 <div class="RedPackage__Box js-RedPackageBox" data-txt>
  <img src="./images/redPackage.png" alt="">
 </div>
</div>

<div class="RedPackage__Main js-RedPackage"></div>

const $redPackage = $('.js-RedPackage');
const $redPackageBox = $('.js-RedPackageBox');
const redPackageWidth = $redPackage.width();
const redPackageBoxWidth = $redPackageBox.width();
//因为红包有角度旋转的问题，所以需要计算一下，避免旋转之后溢出屏幕
const basePadding = 30;
const maxLeftPx = redPackageWidth - redPackageBoxWidth - basePadding * 2;
 
//每一个红包都是相对于父元素定位，通过z-index来设置层级
let zIndex = 1;
 
function bindEvent() {
 $redPackage.on('click', '.js-RedPackageBox', function() {
 //拿到每个红包的数据
 const data = $(this).data('txt');
 }
}
 
//生成mix-max的随机数
function getRandom(min, max) {
 return Math.round(Math.random() * (max - min) + min);
}
 
//红包的移动
function redPackageBoxSpeed($el, time) {
 $el.animate(
 {
 top: '130%',
 },
 time * 1000,
 function() {
 $el.remove();
 }
 );
}
 
//生成红包
function createRedPackageNode() {
 const $newNode = $redPackageBox.clone(true);
 //红包携带的数据
 const txt = keyList.shift();
 keyList.push(txt);
 $newNode.attr('data-txt', JSON.stringify(txt));
 
 //红包随机旋转-30～30度
 $newNode.css({
 'z-index': zIndex++,
 left: getRandom(basePadding, maxLeftPx) + 'px',
 transform: 'rotate(' + getRandom(-30, 30) + 'deg)',
 });
 $redPackage.append($newNode);
 
 redPackageBoxSpeed($newNode, 4);
}
 
//红包的动态创建
function createRedPackageRain() {
 setInterval(() => {
 createRedPackageNode();
 }, 300);
}
 
function ready() {
 bindEvent();
 createRedPackageRain();
}
 
ready();