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上班期间也没时间去更新博客，元旦休假的时候就写点内容，分享一段 WordPress博客网站下雪特效，喜欢的话也可以拿到你的网站去使用。
cancelAnimationFrame = window.cancelAnimationFrame ||
window.mozCancelAnimationFrame ||
window.webkitCancelAnimationFrame ||
window.msCancelAnimationFrame ||
window.oCancelAnimationFrame;
/* 开始下雪 */
snowFall.prototype.start = function(){
/* 创建画布 */
snowCanvas.apply(this);
/* 创建雪花形状 */
createFlakes.apply(this);
/* 画雪 */
drawSnow.apply(this)
}
/* 创建画布 */
function snowCanvas() {
/* 添加Dom结点 */
var snowcanvas = document.createElement("canvas");
snowcanvas.id = "snowfall";
snowcanvas.width = window.innerWidth;
snowcanvas.height = document.body.clientHeight;
snowcanvas.setAttribute("style","position:absolute; top: 0; left: 0; z-index: 1; pointer-events: none;");
document.getElementsByTagName("body")[0].appendChild(snowcanvas);
this.canvas = snowcanvas;
this.ctx = snowcanvas.getContext("2d");
/* 窗口大小改变的处理 */
window.onresize = function() {
snowcanvas.width = window.innerWidth;
/* snowcanvas.height = window.innerHeight */
}
}
/* 雪运动对象 */
function flakeMove(canvasWidth,canvasHeight,flakeSize,fallSpeed) {
this.x = Math.floor(Math.random() * canvasWidth); /* x坐标 */
this.y = Math.floor(Math.random() * canvasHeight); /* y坐标 */
this.size = Math.random() * flakeSize + 2; /* 形状 */
this.maxSize = flakeSize; /* 最大形状 */
this.speed = Math.random() * 1 + fallSpeed; /* 坠落速度 */
this.fallSpeed = fallSpeed; /* 坠落速度 */
this.velY = this.speed; /* Y方向速度 */
this.velX = 0; /* X方向速度 */
this.stepSize = Math.random() / 30; /* 步长 */
this.step = 0 /* 步数 */
}
flakeMove.prototype.update = function() {
var x = this.x,y = this.y;
/* 左右摆动(余弦) */
this.velX *= 0.98;
if (this.velY <= this.speed) { this.velY = this.speed } this.velX += Math.cos(this.step += .05) * this.stepSize; this.y += this.velY; this.x += this.velX; /* 飞出边界的处理 */ if (this.x >= canvas.width || this.x <= 0 || this.y >= canvas.height || this.y <= 0) {
this.reset(canvas.width,canvas.height)
}
};
/* 飞出边界-放置最顶端继续坠落 */
flakeMove.prototype.reset = function(width,height) {
this.x = Math.floor(Math.random() * width);
this.y = 0;
this.size = Math.random() * this.maxSize + 2;
this.speed = Math.random() * 1 + this.fallSpeed;
this.velY = this.speed;
this.velX = 0;
};
// 渲染雪花-随机形状（此处可修改雪花颜色！！！）
flakeMove.prototype.render = function(ctx) {
var snowFlake = ctx.createRadialGradient(this.x,this.y,this.x,this.size);
snowFlake.addColorStop(0,"rgba(255,255,0.9)"); /* 此处是雪花颜色，默认是白色 */
snowFlake.addColorStop(.5,0.5)"); /* 若要改为其他颜色，请自行查 */
snowFlake.addColorStop(1,0)"); /* 找16进制的RGB 颜色代码。 */
ctx.save();
ctx.fillStyle = snowFlake;
ctx.beginPath();
ctx.arc(this.x,this.size,Math.PI * 2);
ctx.fill();
ctx.restore();
};
/* 创建雪花-定义形状 */
function createFlakes() {
var maxFlake = this.maxFlake,flakes = this.flakes = [],canvas = this.canvas;
for (var i = 0; i < maxFlake; i++) {
flakes.push(new flakeMove(canvas.width,canvas.height,this.flakeSize,this.fallSpeed))
}
}
/* 画雪 */
function drawSnow() {
var maxFlake = this.maxFlake,flakes = this.flakes;
ctx = this.ctx,canvas = this.canvas,that = this;
/* 清空雪花 */
ctx.clearRect(0,canvas.width,canvas.height);
for (var e = 0; e < maxFlake; e++) {
flakes[e].update();
flakes[e].render(ctx);
}
/* 一帧一帧的画 */
this.loop = requestAnimationFrame(function() {
drawSnow.apply(that);
});
}
/* 调用及控制方法 */
var snow = new snowFall({maxFlake:60});
snow.start();
使用方法：
方法①：复制其中一种JS代码，粘贴到网站 |
