第九天，HTML/Vue代码在线实时编辑、预览

<!DOCTYPE html> <html lang="pt-br"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1"> <title>Pendulo de Newton</title> <link rel="stylesheet" href="style.css" type="text/css" media="all"> <link href="https://fonts.googleapis.com/css?family=Lato:400,700" rel="stylesheet"> </head> <body> <div class="pendulo"> </div> </body> </html>

            
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             body 
{
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: #2c3e50;
}

.pendulo 
{
    display: flex;
    border-top: 10px solid white;
}

.pendulo span 
{
    display: block;
    width: 3px;
    height: 300px;
    background-color: white;
    margin: 0 29px;
    position: relative;
    transform-origin: top;
}

.pendulo span:before 
{
    content: "";
    position: absolute;
    bottom: 0;
    left: 0;
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background-color: white;
    transform: translateX(-50%);
}

.pendulo span:first-child 
{
    animation: left-arm 2s ease-in infinite;
}

.pendulo span:last-child 
{
    animation: right-arm 2s ease-in infinite 1s;
}

@keyframes left-arm 
{
    0% { transform: rotate(0deg); }
    25% { transform: rotate(60deg); }
    50% { transform: rotate(0deg); }
    100% { transform: rotate(0deg); }
}

@keyframes right-arm 
{
    0% { transform: rotate(0deg); }
    25% { transform: rotate(-60deg); }
    50% { transform: rotate(0deg); }
    100% { transform: rotate(0deg); }
}