代码
<!DOCTYPE html><html lang="en"><head><meta charset="UTF-8"><title>Title</title><style>div{height: 200px;width: 200px;background-color: red;border-radius: 100%;margin: 200px;animation: twinkle 0.5s infinite alternate;}@keyframes twinkle {0%{opacity:.0.8;}100%{opacity:0;}}</style></head><body><div id="div"></div></body><script></script></html>
运行效果
不断闪烁
