懂科普html星空特效代码
- IT科技
- 关注：2.41W次
品牌型号：联想 YOGA 14c/系统版本：windows7
<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=["浩瀚星辰"], 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>
- 文章版权属于文章作者所有，转载请注明 https://dongkepu.com/itkeji/77wok8.html
