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准备好需要用到的图标。

新建html文档。

初始化css代码。

<style>

*{margin:0;padding:0;list-style:none;}

html,body{height:100%;}

body{background: url(images/bg.jpg) no-repeat center center;background-size:cover;}

</style>

书写css下雪场景核心代码代码。

<style>

.Snowflake{animation:linear spin infinite 20s;-webkit-animation:linear spin infinite 20s;-moz-animation:linear spin infinite 20s;pointer-events:none;}

@keyframes spin{

0% {transform:rotate(0deg);}

100% {transform:rotate(359deg);}

}

@-webkit-keyframes spin{

0% {-webkit-transform:rotate(0deg);}

100% {-webkit-transform:rotate(359deg);}

}

@-moz-keyframes spin{

0% {-moz-transform:rotate(0deg);}

100% {-moz-transform:rotate(359deg);}

}</style>

书写并添加js代码。

<script src="js/snowflake.js"></script>

<script>

createSnow('', 200);

</script>

书写<script src="js/snowflake.js"></script>代码。

<script>

(function() {

function b(g, f, h) {

if (g.addEventListener) {

g.addEventListener(f, h, false)

} else {

g.attachEvent && g.attachEvent("on" + f, h)

}

}

function m(g) {

if (typeof window.onload != "function") {

window.onload = g

} else {

var f = window.onload;

window.onload = function() {

f();

g()

}

}

}

function e() {

var g = {};

for (type in {

Top: "",

Left: ""

}) {

var f = type == "Top" ? "Y" : "X";

if (typeof window["page" + f + "Offset"] != "undefined") {

g[type.toLowerCase()] = window["page" + f + "Offset"]

} else {

f = document.documentElement.clientHeight ? document.documentElement : document.body;

g[type.toLowerCase()] = f["scroll" + type]

}

}

return g

}

function a() {

var g = document.body,

f;

if (window.innerHeight) {

f = window.innerHeight

} else {

if (g.parentElement.clientHeight) {

f = g.parentElement.clientHeight

} else {

if (g && g.clientHeight) {

f = g.clientHeight

}

}

}

return f

}

function d(f) {

this.parent = document.body;

this.createEl(this.parent, f);

this.size = Math.random() * 20 + 10;

this.el.style.width = Math.round(this.size) + "px";

this.el.style.height = Math.round(this.size) + "px";

this.maxLeft = document.body.offsetWidth - this.size;

this.maxTop = document.body.offsetHeight - this.size;

this.left = Math.random() * this.maxLeft;

this.top = e().top + 1;

this.angle = 1.4 + 0.2 * Math.random();

this.minAngle = 1.4;

this.maxAngle = 1.6;

this.angleDelta = 0.01 * Math.random();

this.speed = 2 + Math.random()

}

var c = false;

m(function() {

c = true

});

var n = true;

window.createSnow = function(h, g) {

if (c) {

var i = [],

f = setInterval(function() {

n && g > i.length && Math.random() < g * 0.0025 && i.push(new d(h));

!n && !i.length && clearInterval(f);

for (var j = e().top, l = a(), k = i.length - 1; k >= 0; k--) {

if (i[k]) {

if (i[k].top < j || i[k].top + i[k].size + 1 > j + l) {

i[k].remove();

i[k] = null;

i.splice(k, 1)

} else {

i[k].move();

i[k].draw()

}

}

}

}, 40);

b(window, "scroll", function() {

for (var j = i.length - 1; j >= 0; j--) {

i[j].draw()

}

})

} else {

m(function() {

createSnow(h, g)

})

}

};

window.removeSnow = function() {

n = false

};

d.prototype = {

createEl: function(g, f) {

this.el = document.createElement("img");

this.el.setAttribute("src", "images/Snowflake.png");

this.el.style.position = "absolute";

this.el.style.display = "block";

this.el.style.zIndex = "99999";

this.el.className = "Snowflake";

this.parent.appendChild(this.el)

},

move: function() {

if (this.angle < this.minAngle || this.angle > this.maxAngle) {

this.angleDelta = -this.angleDelta

}

this.angle += this.angleDelta;

this.left += this.speed * Math.cos(this.angle * Math.PI);

this.top -= this.speed * Math.sin(this.angle * Math.PI);

if (this.left < 0) {

this.left = this.maxLeft

} else {

if (this.left > this.maxLeft) {

this.left = 0

}

}

},

draw: function() {

this.el.style.top = Math.round(this.top) + "px";

this.el.style.left = Math.round(this.left) + "px"

},

remove: function() {

this.parent.removeChild(this.el);

this.parent = this.el = null

}

}

})();

</script>

代码整体结构。

查看效果。