定义一个div 太阳轨道sunline,边框显示出来,定义position为relative
#sunline{
width: 500px;
height: 500px;
border:2px solid #000;
border-radius: 50%;
margin:50px auto;
position: relative;
animation:sunRotate 5s;
}
定义一个div 太阳sun,把红太阳放在中间,居中显示,定义position为absolute,
距左50%,剧上50%,左边距负的宽度的一半,上边距负的高度的一半
#sun{
background: red;
width: 150px;
height: 150px;
position: absolute;
left: 50%;
top:50%;
margin-left:-75px;
margin-top: -75px;
border-radius: 50%;
}
定义一个地球的轨道 earthline,边框显示出来,定义position为absolute,距左50%,剧上负的高度一半,左边距负的宽度的一半
#earthline{
width: 200px;
height: 200px;
border:1px solid #000;
border-radius: 50%;
position: absolute;
left: 50%;
top: -100px;
margin-left: -100px;
}
定义一个div 地球 earth,把地球放在水平居中,太阳轨道垂直地球居中,定义position为absolute,距左50%,剧上50%,左边距负的宽度的一半,上边距负的高度的一半
#earth{
background: green;
width: 100px;
height: 100px;
border-radius: 50%;
position: absolute;
left: 50%;
margin-left: -50px;
top: 50%;
margin-top: -50px;
}
定义一个月球moon,定义position为absolute,距左50%,剧上负的高度一半,左边距负的宽度的一半
#moon{
width: 40px;
height: 40px;
background: blue;
border-radius: 50%;
position: absolute;
left: 50%;
margin-left: -20px;
top: -20px;
}
定义动画@keyframes,100%的进度的时候,旋转一圈
@keyframes sunRotate{
100%{
transform:rotate(360deg);
}
}
为太阳轨道sunline绑定动画,使用属性animation,参数:规则名称,执行时间,速度曲线,延迟时间,播放次数,是否反向
animation:sunRotate 10s linear 0s infinite;
速度曲线: linear(线性匀速) ease(缓动)
播放次数:infinite(无限次数)
为地球轨道earthline绑定动画
animation:sunRotate 5s linear 0s infinite; 运行时间不一样,这个快
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title></title> <style> #sunline{width: 500px;height: 500px;border:2px solid #000;border-radius: 50%;margin:100px auto;position: relative;animation:sunRotate 10s linear 0s infinite; } #sun{background: red;width: 150px;height: 150px;position: absolute;left: 50%;top:50%;margin-left:-75px;margin-top: -75px;border-radius: 50%; } #earthline{width: 200px;height: 200px;border:1px solid #000;border-radius: 50%;position: absolute;left: 50%;top: -100px;margin-left: -100px;animation:sunRotate 5s linear 0s infinite; } #earth{background: green;width: 100px;height: 100px;border-radius: 50%;position: absolute;left: 50%;margin-left: -50px;top: 50%;margin-top: -50px; }#moon{width: 40px;height: 40px; background: blue;border-radius: 50%;position: absolute;left: 50%;margin-left: -20px;top: -20px; } @keyframes sunRotate{100%{transform:rotate(360deg);} } </style> </head> <body> <div id="sunline"><div id="sun"></div><div id="earthline"><div id="earth"></div><div id="moon"></div></div> </div> </body> </html>