具体实现代码：

<!--全站雪花-->
<script type="text/javascript">
    function snowFall(snow) {
        snow = snow || {};
        this.maxFlake = snow.maxFlake || 200;  
        this.flakeSize = snow.flakeSize || 10; 
        this.fallSpeed = snow.fallSpeed || 1; 
    }
    requestAnimationFrame = window.requestAnimationFrame ||
        window.mozRequestAnimationFrame ||
        window.webkitRequestAnimationFrame ||
        window.msRequestAnimationFrame ||
        window.oRequestAnimationFrame ||
        function(callback) { setTimeout(callback, 1000 / 60); };
 
    cancelAnimationFrame = window.cancelAnimationFrame ||
        window.mozCancelAnimationFrame ||
        window.webkitCancelAnimationFrame ||
        window.msCancelAnimationFrame ||
        window.oCancelAnimationFrame;
    snowFall.prototype.start = function(){
        snowCanvas.apply(this);
        createFlakes.apply(this);
        drawSnow.apply(this)
    }
    function snowCanvas() {
        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");
        window.onresize = function() {
            snowcanvas.width = window.innerWidth;
            /* snowcanvas.height = window.innerHeight */
        }
    }
    function flakeMove(canvasWidth, canvasHeight, flakeSize, fallSpeed) {
        this.x = Math.floor(Math.random() * canvasWidth);  
        this.y = Math.floor(Math.random() * canvasHeight); 
        this.size = Math.random() * flakeSize + 2; 
        this.maxSize = flakeSize; 
        this.speed = Math.random() * 1 + fallSpeed; 
        this.fallSpeed = fallSpeed; 
        this.velY = this.speed;
        this.velX = 0;
        this.stepSize = Math.random() / 30; 
        this.step = 0
    }
    flakeMove.prototype.update = function() {
        var x = this.x,
            y = this.y;
        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;
        if (this.x >= canvas.width || this.x <= 0 || this.y >= canvas.height || this.y <= 0) {
            this.reset(canvas.width, canvas.height)
        }
    };
    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;
    };
    flakeMove.prototype.render = function(ctx) {
        var snowFlake = ctx.createRadialGradient(this.x, this.y, 0, this.x, this.y, this.size);
        snowFlake.addColorStop(0, "rgba(255, 255, 255, 0.9)");  
        snowFlake.addColorStop(.5, "rgba(255, 255, 255, 0.5)"); 
        snowFlake.addColorStop(1, "rgba(255, 255, 255, 0)"); 
        ctx.save();
        ctx.fillStyle = snowFlake;
        ctx.beginPath();
        ctx.arc(this.x, this.y, this.size, 0, Math.PI * 2);
        ctx.fill();
        ctx.restore();
    };
    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))
        }
    }
    function drawSnow() {
        var maxFlake = this.maxFlake,
            flakes = this.flakes;
        ctx = this.ctx, canvas = this.canvas, that = this;
        ctx.clearRect(0, 0, canvas.width, canvas.height);
        for (var e = 0; e < maxFlake; e++) {
            flakes[e].update();
            flakes[e].render(ctx);
        }
        this.loop = requestAnimationFrame(function() {
            drawSnow.apply(that);
        });
    }
    var snow = new snowFall({maxFlake:500});
    snow.start();
</script>   

怎么使用？

直接将代码复制到网站</body></html>中间</body>这里放上面的代码</html>，保存即可。