咱这用的就是这玩意儿。
挺普遍的hh，为了方便理解，理清思路后代码实现如下：
!function (e, t, a) {
function r() {
for (var e = 0; e < s.length; e++)
s[e].alpha <= 0 ? (t.body.removeChild(s[e].el), s.splice(e, 1)) : (s[e].y--, s[e].scale += .004, s[e].alpha -= .013, s[e].el.style.cssText = "left:" + s[e].x + "px;top:" + s[e].y + "px;opacity:" + s[e].alpha + ";transform:scale(" + s[e].scale + "," + s[e].scale + ") rotate(45deg);background:" + s[e].color + ";z-index:99999");
requestAnimationFrame(r)
}
function n() {
var t = "function" == typeof e.onclick && e.onclick;e.onclick = function (e) {t && t(), o(e)}
}
function o(e) {
var a = t.createElement("div");
a.className = "heart", s.push({el: a,x: e.clientX - 5,y: e.clientY - 5,scale: 1,alpha: 1,color: c()}), t.body.appendChild(a)
}
function i(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 c() {
return "rgb(" + ~~(255 * Math.random()) + "," + ~~(255 * Math.random()) + "," + ~~(255 * Math.random()) + ")"
}
var s = [];
e.requestAnimationFrame = e.requestAnimationFrame || e.webkitRequestAnimationFrame || e.mozRequestAnimationFrame || e.oRequestAnimationFrame || e.msRequestAnimationFrame || function (e) {
setTimeout(e, 1e3 / 60)
}, i("d.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;}\
"), n(), r()
}
(window, document);
这里是完全缩减的代码：
!function (e, t, a) {function r() {for (var e = 0; e < s.length; e++) s[e].alpha <= 0 ? (t.body.removeChild(s[e].el), s.splice(e, 1)) : (s[e].y--, s[e].scale += .004, s[e].alpha -= .013, s[e].el.style.cssText = "left:" + s[e].x + "px;top:" + s[e].y + "px;opacity:" + s[e].alpha + ";transform:scale(" + s[e].scale + "," + s[e].scale + ") rotate(45deg);background:" + s[e].color + ";z-index:99999");requestAnimationFrame(r)}function n() {var t = "function" == typeof e.onclick && e.onclick;e.onclick = function (e) {t && t(), o(e)}}function o(e) {var a = t.createElement("div");a.className = "heart", s.push({el: a,x: e.clientX - 5,y: e.clientY - 5,scale: 1,alpha: 1,color: c()}), t.body.appendChild(a)}function i(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 c() {return "rgb(" + ~~(255 * Math.random()) + "," + ~~(255 * Math.random()) + "," + ~~(255 * Math.random()) + ")"}var s = [];e.requestAnimationFrame = e.requestAnimationFrame || e.webkitRequestAnimationFrame || e.mozRequestAnimationFrame || e.oRequestAnimationFrame || e.msRequestAnimationFrame || function (e) {setTimeout(e, 1e3 / 60)}, i(".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;}"), n(), r()}(window, document);