点击页面出现小爱心特效

无意间看到的一个小特效：点击页面任意处，出现一个逐渐消失的小爱心

! function (e, t, a) {
            function n() {
                c(".heart{width: 10px;height: 10px;position: fixed;background: #f00;transform: rotate(45deg);-webkit-transform: rotate(45deg);-moz-transform: rotate(45deg);}.heart:after,.heart:before{content: '';width: inherit;height: inherit;background: inherit;border-radius: 50%;-webkit-border-radius: 50%;-moz-border-radius: 50%;position: fixed;}.heart:after{top: -5px;}.heart:before{left: -5px;}"),
                    o(), r()
            }

            function r() {
                for (var e = 0; e < d.length; e++) d[e].alpha <= 0 ? (t.body.removeChild(d[e].el), d.splice(e, 1)) : (d[
                        e].y--, d[e].scale += .004, d[e].alpha -= .013, d[e].el.style.cssText = "left:" + d[e].x +
                    "px;top:" + d[e].y + "px;opacity:" + d[e].alpha + ";transform:scale(" + d[e].scale + "," + d[e]
                    .scale + ") rotate(45deg);background:" + d[e].color + ";z-index:99999");
                requestAnimationFrame(r)
            }

            function o() {
                var t = "function" == typeof e.onclick && e.onclick;
                e.onclick = function (e) {
                    t && t(), i(e)
                }
            }

            function i(e) {
                var a = t.createElement("div");
                a.className = "heart", d.push({
                    el: a,
                    x: e.clientX - 5,
                    y: e.clientY - 5,
                    scale: 1,
                    alpha: 1,
                    color: s()
                }), t.body.appendChild(a)
            }

            function c(e) {
                var a = t.createElement("style");
                a.type = "text/css";
                try {
                    a.appendChild(t.createTextNode(e))
                } catch (t) {
                    a.styleSheet.cssText = e
                }
                t.getElementsByTagName("head")[0].appendChild(a)
            }

            function s() {
                return "rgb(" + ~~(255 * Math.random()) + "," + ~~(255 * Math.random()) + "," + ~~(255 * Math
                .random()) + ")"
            }
            var d = [];
            e.requestAnimationFrame = function () {
                return e.requestAnimationFrame || e.webkitRequestAnimationFrame || e.mozRequestAnimationFrame || e
                    .oRequestAnimationFrame || e.msRequestAnimationFrame || function (e) {
                        setTimeout(e, 1e3 / 60)
                    }
            }(), n()
        }(window, document);