通过案例，了解CSS3创建简单动画的方法

 @keyframes myfirst
    {
        from{transform: rotate(0deg)}to{transform: rotate(360deg)}
    }
    .loading{
                //infinite控制执行次数这里一直执行，linear执行速度，匀速
        animation: myfirst 1.5s infinite linear;
        border: 16px solid #f3f3f3;
        border-radius: 50%;
        border-top:16px solid blue;
        width: 120px;
        height: 120px;
    }
    
    <div class="loading"></div>

.move {
        width: 0px;
        height: 10px;
        animation: moveHover 5s infinite linear;

    }
    
  <div class="move"></div>

    .change
    {
        transition: width 2s;
        font-size: 10px;
        width: 100px;
        height: 20px;
        background: yellow;
        -moz-transition: width 2s;    /* Firefox 4 */
        -webkit-transition: width 2s;    /* Safari 和 Chrome */
        -o-transition: width 2s;    /* Opera */
    }
    .change:hover
    {
        width: 500px;
    }
    <div class="change">鼠标滑过</div>

    .bigger{
        font-size: 20px;
        width: 0;
        height: 0;//scale根据宽高变大，必须设置width和height
        background: #2A9F00;
        transition: transform 5s;
    }
    .bigger:hover{
        transform: scale(10);
    }
    <div class="bigger">大</div>