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();