冬天到了,分享两款雪花特效代码 |
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冬天到了,或者圣诞节到了,很多网站会用到雪花特效, 今天我就分享两款觉得比较好的雪花js特效代码给大家, 当然不是小弟原创的,得感谢原创作者的无私奉献 一、下雪特效代码① 该特效的雪花是有雪花的八角形状的 代码语言:javascript复制 (function($){ $.fn.snow = function(options){ var $flake = $('').css({'position': 'absolute','z-index':'9999', 'top': '-50px'}).html('❄'), documentHeight = $(document).height(), documentWidth = $(document).width(), defaults = { minSize : 10, maxSize : 20, newOn : 1000, flakeColor : "#AFDAEF" /* 此处可以定义雪花颜色,若要白色可以改为#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, /* 定义雪花最小尺寸 */ maxSize: 50,/* 定义雪花最大尺寸 */ newOn: 300 /* 定义密集程度,数字越小越密集 */ }); });二、下雪特效代码② 该特效的雪花是小圆点形状的 代码语言:javascript复制 /* 控制下雪 */ function snowFall(snow) { /* 可配置属性 */ snow = snow || {}; this.maxFlake = snow.maxFlake || 200; /* 最多片数 */ this.flakeSize = snow.flakeSize || 10; /* 雪花形状 */ this.fallSpeed = snow.fallSpeed || 1; /* 坠落速度 */ } /* 兼容写法 */ 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; /* 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 = canvas.width || this.x = canvas.height || this.y |
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