ZBlogPHP动态背景,网站动态气泡背景代码

网站从最初的纯色背景，到后来的单一的图片背景，再到后来图片API，到现在动态背景。背景不断演化的过程也是自己学习的过程。从最基础的通过css修改网站背景颜色、背景图，到后来自己用PHP写图片API，再到现在动态背景，接触的新知识越来越多。虽然说好多东西都是基于别人网站来的灵感，但是自己通过研究和学习也实现了类似的功能，这种成就感对于一个小白来说非常nice。

下面就给大家分享一下，一款动态气泡背景的代码：

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<div id="bubble"><canvas width="1418" height="642" style="display: block; position: fixed; top: 0px; left: 0px; z-index: -1;"></canvas></div><script>class BGBubble{constructor(i){this.defaultOpts={id:"",num:100,start_probability:.1,radius_min:1,radius_max:2,radius_add_min:.3,radius_add_max:.5,opacity_min:.3,opacity_max:.5,opacity_prev_min:.003,opacity_prev_max:.005,light_min:40,light_max:70,is_same_color:!1,background:"#f1f3f4"},"[object Object]"==Object.prototype.toString.call(i)?this.userOpts={...this.defaultOpts,...i}:this.userOpts={...this.defaultOpts,id:i},this.color=this.random(0,360),this.bubbleNum=[],this.requestAnimationFrame=window.requestAnimationFrame||window.mozRequestAnimationFrame||window.webkitRequestAnimationFrame||window.msRequestAnimationFrame,this.cancelAnimationFrame=window.cancelAnimationFrame||window.mozCancelAnimationFrame}random(i,t){return Math.random()*(t-i)+i}initBubble(i,t){const a=window.innerWidth,s=window.innerHeight,n=this.userOpts,e=this.random(n.light_min,n.light_max);this.bubble={x:this.random(0,a),y:this.random(0,s),radius:this.random(n.radius_min,n.radius_max),radiusChange:this.random(n.radius_add_min,n.radius_add_max),opacity:this.random(n.opacity_min,n.opacity_max),opacityChange:this.random(n.opacity_prev_min,n.opacity_prev_max),light:e,color:`hsl(${t?i:this.random(0,360)},100%,${e}%)`}}bubbling(i,t,a){!this.bubble&&this.initBubble(t,a);const s=this.bubble;i.fillStyle=s.color,i.globalAlpha=s.opacity,i.beginPath(),i.arc(s.x,s.y,s.radius,0,2*Math.PI,!0),i.closePath(),i.fill(),i.globalAlpha=1,s.opacity-=s.opacityChange,s.radius+=s.radiusChange,s.opacity<=0&&this.initBubble(t,a)}createCanvas(){this.canvas=document.createElement("canvas"),this.ctx=this.canvas.getContext("2d"),this.canvas.style.display="block",this.canvas.width=window.innerWidth,this.canvas.height=window.innerHeight,this.canvas.style.position="fixed",this.canvas.style.top="0",this.canvas.style.left="0",this.canvas.style.zIndex="-1",document.getElementById(this.userOpts.id).appendChild(this.canvas),window.onresize=(()=>{this.canvas.width=window.innerWidth,this.canvas.height=window.innerHeight})}start(){const i=window.innerWidth,t=window.innerHeight;this.color+=.1,this.ctx.fillStyle=this.defaultOpts.background,this.ctx.fillRect(0,0,i,t),this.bubbleNum.length<this.userOpts.num&&Math.random()<this.userOpts.start_probability&&this.bubbleNum.push(new BGBubble),this.bubbleNum.forEach(i=>i.bubbling(this.ctx,this.color,this.userOpts.is_same_color));const a=this.requestAnimationFrame;this.myReq=a(()=>this.start())}destory(){(0,this.cancelAnimationFrame)(this.myReq),window.onresize=null}}const bubbleDemo=new BGBubble("bubble");bubbleDemo.createCanvas(),bubbleDemo.start();</script>
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