开源超美css动态背景 可直接引入html文件使用 含注释、可更改
1.背景样式
本背景为动态蜘蛛网背景。
上图:
2.如何在html里面引用,作为html背景
1文件目录
放在同一目录下
2 在index.html内引用
<html> <script src="change.js" type="text/javascript"></script> <body> </body> </html>
直接引用就好了,所以很方便可以当做自己以后设计网页的专用包、背景那样。
3.js代码
注:此代码是在网上下载的,要看懂可能需要一点小功夫。所以我给js代码里面加了很多注释,方便大家修改background、一些样式、等等等等
上js代码:
window.onload=function(){ //定义body的margin由默认值8px->0px document.body.style.margin="0"; document.body.style.background="#30333F"; //创建canvas画布 document.body.appendChild(document.createElement('canvas')); var canvas = document.querySelector('canvas'), ctx = canvas.getContext('2d') //ctx返回一个在canvas上画图的api/dom canvas.width = window.innerWidth; canvas.height = window.innerHeight; canvas.style.position='fixed'; ctx.lineWidth = .3; ctx.strokeStyle = (new Color(150)).style; //定义鼠标覆盖范围 var mousePosition = { x: 30 * canvas.width / 100, y: 30 * canvas.height / 100 }; var dots = { nb: 1000,//Dot的总数 distance: 50, d_radius: 100, array: [] }; //创建颜色类,Color类返回字符串型rgba(*,*,*,.8) function mixComponents(comp1, weight1, comp2, weight2) { return (comp1 * weight1 + comp2 * weight2) / (weight1 + weight2); } function averageColorStyles(dot1, dot2) { var color1 = dot1.color, color2 = dot2.color; var r = mixComponents(color1.r, dot1.radius, color2.r, dot2.radius), g = mixComponents(color1.g, dot1.radius, color2.g, dot2.radius), b = mixComponents(color1.b, dot1.radius, color2.b, dot2.radius); return createColorStyle(Math.floor(r), Math.floor(g), Math.floor(b)); } function colorValue(min) { return Math.floor(Math.random() * 255 + min); } function createColorStyle(r,g,b) { return 'rgba(' + r + ',' + g + ',' + b + ', 0.8)'; } function Color(min) { min = min || 0; this.r = colorValue(min); this.g = colorValue(min); this.b = colorValue(min); this.style = createColorStyle(this.r, this.g, this.b); } //创建Dot类以及一系列方法 function Dot(){ this.x = Math.random() * canvas.width; this.y = Math.random() * canvas.height; this.vx = -.5 + Math.random(); this.vy = -.5 + Math.random(); this.radius = Math.random() * 2; this.color = new Color(); } Dot.prototype = { draw: function(){ ctx.beginPath(); ctx.fillStyle = this.color.style; ctx.arc(this.x, this.y, this.radius, 0, Math.PI * 2, false); ctx.fill(); } }; function moveDots() {//Dot对象的移动 for(i = 0; i < dots.nb; i++){ var dot = dots.array[i]; if(dot.y < 0 || dot.y > canvas.height){ dot.vx = dot.vx; dot.vy = - dot.vy; } else if(dot.x < 0 || dot.x > canvas.width){ dot.vx = - dot.vx; dot.vy = dot.vy; } dot.x += dot.vx; dot.y += dot.vy; } } function connectDots(){//DOt对象的连接 for(i = 0; i < dots.nb; i++){ for(j = i; j < dots.nb; j++){ i_dot = dots.array[i]; j_dot = dots.array[j]; if((i_dot.x - j_dot.x) < dots.distance && (i_dot.y - j_dot.y) < dots.distance && (i_dot.x - j_dot.x) > - dots.distance && (i_dot.y - j_dot.y) > - dots.distance){ if((i_dot.x - mousePosition.x) < dots.d_radius && (i_dot.y - mousePosition.y) < dots.d_radius && (i_dot.x - mousePosition.x) > - dots.d_radius && (i_dot.y - mousePosition.y) > - dots.d_radius){ ctx.beginPath(); ctx.strokeStyle = averageColorStyles(i_dot, j_dot); ctx.moveTo(i_dot.x, i_dot.y); ctx.lineTo(j_dot.x, j_dot.y); ctx.stroke();//绘制定义的路线 ctx.closePath();//创建从当前点回到起始点的路径 } } } } } function createDots(){//创建nb个Dot对象 for(i = 0; i < dots.nb; i++){ dots.array.push(new Dot()); } } function drawDots() {//引用Dot原型链,使用draw方法,在canvas上画出Dot对象 for(i = 0; i < dots.nb; i++){ var dot = dots.array[i]; dot.draw(); } } function animateDots() { ctx.clearRect(0, 0, canvas.width, canvas.height);//清除画布,否则线条会连在一起 moveDots(); connectDots(); drawDots(); requestAnimationFrame(animateDots); } createDots();//使用创建Dot类函数 requestAnimationFrame(animateDots);//使用canvas独有的60Hz刷新屏幕画布的方法 document.querySelector('canvas').addEventListener('mousemove',function(e){ mousePosition.x = e.pageX; mousePosition.y = e.pageY; }) document.querySelector('canvas').addEventListener('mouseleave',function(e){//鼠标离开时,连接自动返回到画布中心 mousePosition.x = canvas.width / 2; mousePosition.y = canvas.height / 2; }) }
需要资源可以点击下载:https://download.csdn.net/download/qq_43592352/12368572
2019.3.17
19:53