爲了增加博客站點的趣味性，特意添加了雪花飄落的效果。效果預覽地址：https://donlex.cn ,請在PC端打開，移動端是看不到效果的。
實現方法：在 \themes\next\source\js\src 目錄下新建一個 snow.js 文件，複製粘貼一下代碼。
其中樣式一是六邊形的雪片，樣式二是小圓點的雪花，其自行調試，選擇喜歡的樣式。
/*樣式一*/
(function($){
$.fn.snow = function(options){
var $flake = $('<div id="snowbox" />').css({'position': 'absolute','z-index':'9999', 'top': '-50px'}).html('❄'),
documentHeight = $(document).height(),
documentWidth = $(document).width(),
defaults = {
minSize : 10,
maxSize : 20,
newOn : 1000,
flakeColor : "#AFDAEF" /* 此處可以定義雪花顏色，若要白色可以改爲#FFFFFF */
},
options = $.extend({}, defaults, options);
var interval= setInterval( function(){
var startPositionLeft = Math.random() * documentWidth - 100,
startOpacity = 0.5 + Math.random(),
sizeFlake = options.minSize + Math.random() * options.maxSize,
endPositionTop = documentHeight - 200,
endPositionLeft = startPositionLeft - 500 + Math.random() * 500,
durationFall = documentHeight * 10 + Math.random() * 5000;
$flake.clone().appendTo('body').css({
left: startPositionLeft,
opacity: startOpacity,
'font-size': sizeFlake,
color: options.flakeColor
}).animate({
top: endPositionTop,
left: endPositionLeft,
opacity: 0.2
},durationFall,'linear',function(){
$(this).remove()
});
}, options.newOn);
};
})(jQuery);
$(function(){
$.fn.snow({
minSize: 5, /* 定義雪花最小尺寸 */
maxSize: 50,/* 定義雪花最大尺寸 */
newOn: 300 /* 定義密集程度，數字越小越密集 */
});
});
/*樣式二*/
/* 控制下雪 */
function snowFall(snow) {
/* 可配置屬性 */
snow = snow || {};
this.maxFlake = snow.maxFlake || 200; /* 最多片數 */
this.flakeSize = snow.flakeSize || 10; /* 雪花形狀 */
this.fallSpeed = snow.fallSpeed || 1; /* 墜落速度 */
}
/* 兼容寫法 */
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;
/* 開始下雪 */
snowFall.prototype.start = function(){
/* 創建畫布 */
snowCanvas.apply(this);
/* 創建雪花形狀 */
createFlakes.apply(this);
/* 畫雪 */
drawSnow.apply(this)
}
/* 創建畫布 */
function snowCanvas() {
/* 添加Dom結點 */
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");
/* 窗口大小改變的處理 */
window.onresize = function() {
snowcanvas.width = window.innerWidth;
/* snowcanvas.height = window.innerHeight */
}
}
/* 雪運動對象 */
function flakeMove(canvasWidth, canvasHeight, flakeSize, fallSpeed) {
this.x = Math.floor(Math.random() * canvasWidth); /* x座標 */
this.y = Math.floor(Math.random() * canvasHeight); /* y座標 */
this.size = Math.random() * flakeSize + 2; /* 形狀 */
this.maxSize = flakeSize; /* 最大形狀 */
this.speed = Math.random() * 1 + fallSpeed; /* 墜落速度 */
this.fallSpeed = fallSpeed; /* 墜落速度 */
this.velY = this.speed; /* Y方向速度 */
this.velX = 0; /* X方向速度 */
this.stepSize = Math.random() / 30; /* 步長 */
this.step = 0 /* 步數 */
}
flakeMove.prototype.update = function() {
var x = this.x,
y = this.y;
/* 左右擺動(餘弦) */
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;
/* 飛出邊界的處理 */
if (this.x >= canvas.width || this.x <= 0 || this.y >= canvas.height || this.y <= 0) {
this.reset(canvas.width, canvas.height)
}
};
/* 飛出邊界-放置最頂端繼續墜落 */
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-隨機形狀（此處可修改雪花顏色！！！）
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)"); /* 此處是雪花顏色，默認是白色 */
snowFlake.addColorStop(.5, "rgba(255, 255, 255, 0.5)"); /* 若要改爲其他顏色，請自行查 */
snowFlake.addColorStop(1, "rgba(255, 255, 255, 0)"); /* 找16進制的RGB 顏色代碼。 */
ctx.save();
ctx.fillStyle = snowFlake;
ctx.beginPath();
ctx.arc(this.x, this.y, this.size, 0, Math.PI * 2);
ctx.fill();
ctx.restore();
};
/* 創建雪花-定義形狀 */
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))
}
}
/* 畫雪 */
function drawSnow() {
var maxFlake = this.maxFlake,
flakes = this.flakes;
ctx = this.ctx, canvas = this.canvas, that = this;
/* 清空雪花 */
ctx.clearRect(0, 0, canvas.width, canvas.height);
for (var e = 0; e < maxFlake; e++) {
flakes[e].update();
flakes[e].render(ctx);
}
/* 一幀一幀的畫 */
this.loop = requestAnimationFrame(function() {
drawSnow.apply(that);
});
}
/* 調用及控制方法 */
var snow = new snowFall({maxFlake:60});
snow.start();
然後在 \themes\next\layout\_layout.swig 文件裏<body></body>內部引用即可：
<!-- 雪花特效 -->
<script type="text/javascript">
var windowWidth = $(window).width();
if (windowWidth > 480) {
document.write('<script type="text/javascript" src="/js/src/snow.js"><\/script>');
}
</script>
上面的代碼爲了不影響移動端的閱讀體驗，特意增加了屏幕寬度的判斷，請根據需要決定是否添加，或者註釋掉。
最後，請確保在你添加的代碼上面已經引入了JQ，否則你還需要導入jq
<script type="text/javascript" src="//libs.baidu.com/jquery/1.8.3/jquery.min.js"></script>
效果預覽地址：https://www.donlex.cn ,請在PC端打開，移動端是看不到效果的。