html+css+js实现星空特效
本文已同步到凯文的博客https://kevindurant-source.github.io./
废话不多说直接上代码，效果是一个星空旋转和文字逐渐出现的效果，文字是逐渐出现的，星空中的小球是旋转的
效果视频博主已发往b站：效果实现地址
效果：
<!DOCTYPE html><html lang="en"><head><meta charset="UTF-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><title>星空特效</title><style>*{margin: 0;padding: 0;}body{overflow: hidden;background-color: #000;}h1{position: absolute;line-height: 50px;letter-spacing: 5px;color: #fff;width: 300px;top: 40%;left: 50%;margin-left: -200px;font-size: 30px;}</style></head><body><h1></h1><canvas></canvas><script>var canvas=document.querySelector("canvas");ctx=canvas.getContext("2d");w=canvas.width=window.innerWidth;h=canvas.height=window.innerHeight;var canvas2=document.createElement("canvas");ctx2=canvas2.getContext("2d");canvas2.width=100;canvas2.height=100;var a=canvas2.width/2;var grandient=ctx.createRadialGradient(a,a,0,a,a,a);grandient.addColorStop(0.025,'#fff');grandient.addColorStop(0.1, 'hsl(220,59%,18%)');grandient.addColorStop(0.025, 'hsl(220,60%,33%)');grandient.addColorStop(1,"transparent");ctx2.fillStyle=grandient;ctx2.beginPath();ctx2.arc(a,a,a,0,Math.PI*2);ctx2.fill();ctx2.closePath();var stars=[];var count=0;function Star(){this.pos=Math.floor(Math.random()* w/2-100);this.r=Math.floor(Math.random()*100);this.dx=w/2;this.dy=h/2;this.rand=Math.floor(Math.random()*360);this.speed=this.pos/100000;stars[count]=this;count ++;}Star.prototype.draw=function(){var x=Math.sin(this.rand+1)* this.pos+this.dx;y=Math.cos(this.rand)*this.pos/2+this.dy;ctx.drawImage(canvas2,x-this.r/2,y-this.r/2,this.r,this.r);this.rand=this.rand+this.speed;}for(var i=0;i<1000;i++){new Star();}function anmit(){ctx.clearRect(0,0,w,h);for(var i=0;i<stars.length;i++){stars[i].draw();}requestAnimationFrame(anmit);}anmit();var oH=document.getElementsByTagName("h1")[0];var arr=["这世间过于俗气","不像你一般","浩瀚星辰,温柔婉转"],index=0,arrLen=arr.length,strLen=arr[0].length;pos=0,row=0,str="",timer=null;function print() {while(row<index){str=str+arr[row]+"<br>";row++;}oH.innerHTML=str+arr[index].substring(0,pos);if(pos==strLen){index++;pos =0;if(index<arr.length){strLen=arr[index].length;timer=setTimeout(print,250);}}else{pos++;timer=setTimeout(print,250);}}setTimeout(print,250);</script></body></html>
