css3 - 如何为background-image设置动画？

Question

用代码说话

    section.tt-grid-wrapper{
    &:hover{
        background-image{
            -webkit-animation: pulse 2.0s infinite ease-in-out;
            animation: pulse 2.0s infinite ease-in-out;
        }
    }   
}

想让该选区在鼠标点击时，只让背景图执行动画，这样的less写法有错，求指点！！

Answer 1

Aren’t there detailed instructions in the css3 animation on w3school for animation instructions? (http://www.w3school.com.cn/css3/css3_animation.asp）
Background execution animation? Just execute the written animation in hove....
This is how I understand it. Demonstration: http://sandbox.runjs.cn/show/eijaxo1t
Code: http://runjs.cn/code/eijaxo1t

Answer 2

Do you want the following effect?
http://jsfiddle.net/chenxiaochun/kgLV5/