background-size搭配transition实现鼠标hover背景图放大问题

background-size的默认值是cover，必须要保证是统一类型的值才能实现过渡效果

无效写法

li {
        padding: 26px 28px 0;
        border-bottom: 1px solid #fff;
        border-right: 1px solid #fff;
        background: url(../images/qiyezhan/pic1.png) no-repeat center;
        &:hover {
          background-size: 120%;
          -webkit-transition: background-size .3s linear;
          transition: background-size .3s linear;
        }
}

　　正确写法

li {
        padding: 26px 28px 0;
        border-bottom: 1px solid #fff;
        border-right: 1px solid #fff;
        background: url(../images/qiyezhan/pic1.png) no-repeat center;
        background-size: 100%;
        &:hover {
          background-size: 120%;
          -webkit-transition: background-size .3s linear;
          transition: background-size .3s linear;
        }
}

　　成功实现过渡放大背景效果