1 <!-- 为页面添加爱心特效 -->
2 (function (window, document, undefined) {
3 var hearts = [];
4 window.requestAnimationFrame = (function () {
5 return window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame || window.oRequestAnimationFrame || window.msRequestAnimationFrame ||
6 function (callback) {
7 setTimeout(callback, 1000 / 60);
8 }
9 })();
10 init();
11
12 function init() {
13 css(".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: absolute;}.heart:after{top: -5px;}.heart:before{left: -5px;}");
14 attachEvent();
15 gameloop();
16 }
17
18 function gameloop() {
19 for (var i = 0; i < hearts.length; i++) {
20 if (hearts[i].alpha <= 0) {
21 document.body.removeChild(hearts[i].el);
22 hearts.splice(i, 1);
23 continue;
24 }
25 hearts[i].y--;
26 hearts[i].scale += 0.004;
27 hearts[i].alpha -= 0.013;
28 hearts[i].el.style.cssText = "left:" + hearts[i].x + "px;top:" + hearts[i].y + "px;opacity:" + hearts[i].alpha + ";transform:scale(" + hearts[i].scale + "," + hearts[i].scale + ") rotate(45deg);background:" + hearts[i].color;
29 }
30 requestAnimationFrame(gameloop);
31 }
32
33 function attachEvent() {
34 var old = typeof window.onclick === "function" && window.onclick;
35 window.onclick = function (event) {
36 old && old();
37 createHeart(event);
38 }
39 }
40
41 function createHeart(event) {
42 var d = document.createElement("div");
43 d.className = "heart";
44 hearts.push({
45 el: d,
46 x: event.clientX - 5,
47 y: event.clientY - 5,
48 scale: 1,
49 alpha: 1,
50 color: randomColor()
51 });
52 document.body.appendChild(d);
53 }
54
55 function css(css) {
56 var style = document.createElement("style");
57 style.type = "text/css";
58 try {
59 style.appendChild(document.createTextNode(css));
60 } catch (ex) {
61 style.styleSheet.cssText = css;
62 }
63 document.getElementsByTagName('head')[0].appendChild(style);
64 }
65
66 function randomColor() {
67 return "rgb(" + (~~(Math.random() * 255)) + "," + (~~(Math.random() * 255)) + "," + (~~(Math.random() * 255)) + ")";
68 }
69 })(window, document);
