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js实现星星海特效的示例

浏览:82日期:2024-04-18 11:23:22

首先需要获取屏幕大小:

var screenWidth = document.documentElement.clientWidth; var screenHeight = document.documentElement.clientHeight;

接着可以定义动画(星星透明度):

@keyframes flash { 0%{opacity: 0} 25%{opacity: 0.25} 50%{opacity: 0.5} 75%{opacity: 0.75} 100%{opacity: 1} }

全部代码如下:

<!DOCTYPE html><html lang='en'><head> <meta charset='UTF-8'> <title>Title</title> <style> div{ width: 70px; height: 80px; background: url('./images/star.jpg') no-repeat; animation: flash 1s; } body{ background-color: black } @keyframes flash { 0%{opacity: 0} 25%{opacity: 0.25} 50%{opacity: 0.5} 75%{opacity: 0.75} 100%{opacity: 1} } </style></head><body><script> var screenWidth = document.documentElement.clientWidth; var screenHeight = document.documentElement.clientHeight; // 生产50个星星 for (let i = 0; i <50 ; i++) { var box=document.createElement(’div’); document.body.appendChild(box); x=Math.random()*screenWidth; y=Math.random()*screenHeight; box.style.position=’relative’; box.style.left=x+’px’; box.style.right=y+’px’; } boxList=document.getElementsByTagName('div'); for (let i = 0; i < boxList.length; i++) { boxList[i].onmouseover=function () { this.style.transform=’scale(1.5,1.5)’; }; boxList[i].onmouseout=function () { this.style.transform=’scale(1,1)’; }; }</script></body></html>

效果如下:

js实现星星海特效的示例

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