Rumah >hujung hadapan web >tutorial js >JS实现飘落星星动画效果
这次给大家带来JS实现飘落星星动画效果,JS实现飘落星星动画效果的注意事项有哪些,下面就是实战案例,一起来看一下。
<!DOCTYPE html> <htmllang="en"> <head> <metacharset="UTF-8"> <title>Title</title> <style> img{ position: absolute; } body { background-image: url(img/bg.jpg); background-size: 100%; } </style> <script> function Star() { this.speed=10; this.img=new Image(); this.img.src="img/star"+parseInt(Math.random()*4+1)+".png"; this.img.style.width=50+'px'; this.img.style.height=50+'px'; this.img.style.top=Math.random()*window.innerHeight+1+'px'; this.img.style.left=Math.random()*window.innerWidth+1+'px'; document.body.appendChild(this.img); } Star.prototype.slip=function () { var that=this; function move() { that.img.style.top=that.img.offsetTop+that.speed+'px'; console.log(that.img.offsetTop+"star"); console.log(window.innerHeight+"window"); if(that.img.offsetTop>window.innerHeight){ clearInterval(sh); that.img.style.height=0; that.img.style.width=0; } } var sh=setInterval(move,100); } setInterval(function () { for(var i=1;i<5;i++){ new Star().slip(); } },1000) </script> <body> </body> </html>
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