小羊是自己画的（真的不是猴子）

也可以用自己的图片转换成base64编码，插入以下代码img.src的参数部分。

源代码：樱花特效

var stop, staticx;
			var img = new Image();
			img.src = "data:image/png;base64,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"
			function Sakura(x, y, s, r, fn) {
				this.x = x;
				this.y = y;
				this.s = s;
				this.r = r;
				this.fn = fn;
			}

			Sakura.prototype.draw = function(cxt) {
				cxt.save();
				var xc = 40 * this.s / 4;
				cxt.translate(this.x, this.y);
				cxt.rotate(this.r);
				cxt.drawImage(img, 0, 0, 40 * this.s, 40 * this.s)
				cxt.restore();
			}

			Sakura.prototype.update = function() {
				this.x = this.fn.x(this.x, this.y);
				this.y = this.fn.y(this.y, this.y);
				this.r = this.fn.r(this.r);
				if(this.x > window.innerWidth ||
					this.x < 0 ||
					this.y > window.innerHeight ||
					this.y < 0
				) {
					this.r = getRandom('fnr');
					if(Math.random() > 0.4) {
						this.x = getRandom('x');
						this.y = 0;
						this.s = getRandom('s');
						this.r = getRandom('r');
					} else {
						this.x = window.innerWidth;
						this.y = getRandom('y');
						this.s = getRandom('s');
						this.r = getRandom('r');
					}
				}
			}

			SakuraList = function() {
				this.list = [];
			}
			SakuraList.prototype.push = function(sakura) {
				this.list.push(sakura);
			}
			SakuraList.prototype.update = function() {
				for(var i = 0, len = this.list.length; i < len; i++) {
					this.list[i].update();
				}
			}
			SakuraList.prototype.draw = function(cxt) {
				for(var i = 0, len = this.list.length; i < len; i++) {
					this.list[i].draw(cxt);
				}
			}
			SakuraList.prototype.get = function(i) {
				return this.list[i];
			}
			SakuraList.prototype.size = function() {
				return this.list.length;
			}

			function getRandom(option) {
				var ret, random;
				switch(option) {
					case 'x':
						ret = Math.random() * window.innerWidth;
						break;
					case 'y':
						ret = Math.random() * window.innerHeight;
						break;
					case 's':
						ret = Math.random();
						break;
					case 'r':
						ret = Math.random() * 6;
						break;
					case 'fnx':
						random = -0.5 + Math.random() * 1;
						ret = function(x, y) {
							return x + 0.5 * random - 1.7;
						};
						break;
					case 'fny':
						random = 1.5 + Math.random() * 0.7
						ret = function(x, y) {
							return y + random;
						};
						break;
					case 'fnr':
						random = Math.random() * 0.03;
						ret = function(r) {
							return r + random;
						};
						break;
				}
				return ret;
			}

			function startSakura() {

				requestAnimationFrame = window.requestAnimationFrame ||
					window.mozRequestAnimationFrame ||
					window.webkitRequestAnimationFrame ||
					window.msRequestAnimationFrame ||
					window.oRequestAnimationFrame;
				var canvas = document.createElement('canvas'),
					cxt;
				staticx = true;
				canvas.height = window.innerHeight;
				canvas.width = window.innerWidth;
				canvas.setAttribute('style', 'position: fixed;left: 0;top: 0;pointer-events: none;');
				canvas.setAttribute('id', 'canvas_sakura');
				document.getElementsByTagName('body')[0].appendChild(canvas);
				cxt = canvas.getContext('2d');
				var sakuraList = new SakuraList();
				for(var i = 0; i < 50; i++) {
					var sakura, randomX, randomY, randomS, randomR, randomFnx, randomFny;
					randomX = getRandom('x');
					randomY = getRandom('y');
					randomR = getRandom('r');
					randomS = getRandom('s');
					randomFnx = getRandom('fnx');
					randomFny = getRandom('fny');
					randomFnR = getRandom('fnr');
					sakura = new Sakura(randomX, randomY, randomS, randomR, {
						x: randomFnx,
						y: randomFny,
						r: randomFnR
					});
					sakura.draw(cxt);
					sakuraList.push(sakura);
				}
				stop = requestAnimationFrame(function() {
					cxt.clearRect(0, 0, canvas.width, canvas.height);
					sakuraList.update();
					sakuraList.draw(cxt);
					stop = requestAnimationFrame(arguments.callee);
				})
			}

			window.onresize = function() {
				var canvasSnow = document.getElementById('canvas_snow');
				canvasSnow.width = window.innerWidth;
				canvasSnow.height = window.innerHeight;
			}

			img.onload = function() {
				startSakura();
			}

			function stopp() {
				if(staticx) {
					var child = document.getElementById("canvas_sakura");
					child.parentNode.removeChild(child);
					window.cancelAnimationFrame(stop);
					staticx = false;
				} else {
					startSakura();
				}
			}