冬天到了，很多的博客空间都加了雪花的效果，于是去看了看他们的效果实现。有好几个效果代码，就拿过来了，有需要的朋友可以拿过去试试看。
雪花大图片：
效果代码一
<script type="text/javascript" language="javascript"> (function() { function k(a, b, c) { if (a.addEventListener) a.addEventListener(b, c, false); else a.attachEvent && a.attachEvent("on" + b, c) } function g(a) { if (typeof window.onload != "function") window.onload = a; else { var b = window.onload; window.onload = function() { b(); a() } } } function h() { var a = {}; for (type in { Top: "", Left: "" }) { var b = type == "Top" ? "Y": "X"; if (typeof window["page" + b + "Offset"] != "undefined") a[type.toLowerCase()] = window["page" + b + "Offset"]; else { b = document.documentElement.clientHeight ? document.documentElement: document.body; a[type.toLowerCase()] = b["scroll" + type] } } return a } function l() { var a = document.body, b; if (window.innerHeight) b = window.innerHeight; else if (a.parentElement.clientHeight) b = a.parentElement.clientHeight; else if (a && a.clientHeight) b = a.clientHeight; return b } function i(a) { this.parent = document.body; this.createEl(this.parent, a); this.size = Math.random() * 5 + 5; 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 = h().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 j = false; g(function() { j = true }); var f = true; window.createSnow = function(a, b) { if (j) { var c = [], m = setInterval(function() { f && b > c.length && Math.random() < b * 0.0025 && c.push(new i(a)); ! f && !c.length && clearInterval(m); for (var e = h().top, n = l(), d = c.length - 1; d >= 0; d--) if (c[d]) if (c[d].top < e || c[d].top + c[d].size + 1 > e + n) { c[d].remove(); c[d] = null; c.splice(d, 1) } else { c[d].move(); c[d].draw() } }, 40); k(window, "scroll", function() { for (var e = c.length - 1; e >= 0; e--) c[e].draw() }) } else g(function() { createSnow(a, b) }) }; window.removeSnow = function() { f = false }; i.prototype = { createEl: function(a, b) { this.el = document.createElement("img"); this.el.setAttribute ("src", b + "雪花图片的绝对链接地址"); this.el.style.position = "absolute"; this.el.style.display = "block"; this.el.style.zIndex = "99999"; 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 } } })(); createSnow("", 40); </script>
将以上面代码直接复制粘贴到主题中的Header或者Footer文件中，如果你只想让文章页面显示，那就直接添加到single就可以了。 下面把雪花图片(所需的素材)提供给大家，小图片： 需要大家上传到自己的博客的当前使用的主题中，然后把代码中的链接改成图片所在的位置即可。效果如本页面所示.
效果代码二：
<html> <head> <script> function start(){ var array=new Array(); var canvas=document.getElementById("mycanvas"); var context=canvas.getContext("2d"); for(var i=0;i<50;i++){ var Showsnow=new showsnow(); array.push(Showsnow); } time=setInterval(function (){ context.clearRect(0,0,canvas.width,canvas.height); for(var i=0;i<array.length;i++){ array[i].move(); array[i].draw(context); } },500); } function showsnow(){ var y=parseInt(Math.random()*50)*10; var x=parseInt(Math.random()*80)*10; this.draw=function(context){ context.font="50px Calibri"; context.fillText("*",x,y); } this.move=function(){ y+=20; if(y>600){ y=0; } } } </script> </head> <body> <input type="button" value="start" /> <br/> <canvas></canvas> </body> </html>
这个效果演示如下（感觉比较丑，不推荐）：
效果代码三
其实实现WordPress博客飘落雪花的还可以用 let it snow 插件。