在mouseleave之后CSS继续动画

Question

有人可以帮助我用css动画吗？我应该也用js吗？ 我想创建悬停动画left-＆gt; right但是在鼠标离开后，我想继续动画left-＆gt; right not right-＆gt; left。

由于

.button_sliding_bg {
    color: #31302B;
    background: #FFF;
    padding: 12px 17px;
    margin: 25px;
    font-family: 'OpenSansBold', sans-serif;
    border: 3px solid #31302B;
    font-size: 14px;
    font-weight: bold;
    letter-spacing: 1px;
    text-transform: uppercase;
    border-radius: 2px;
    display: inline-block;
    text-align: center;
    cursor: pointer;
    box-shadow: inset 0 0 0 0 #31302B;
	-webkit-transition: all ease 0.8s;
	-moz-transition: all ease 0.8s;
	transition: all ease 0.8s;
}
.button_sliding_bg:hover {
    box-shadow: inset 100px 0 0 0 #31302B;
    color: #FFF;
}

<button class="button_sliding_bg">
Button
</button>

我想要这样的事情：

以下是解决方案：

window.setTimeout(function() {
document.getElementById('btn').style.visibility = 'visible';
}, 400);

.button_sliding_bg {
    visibility:hidden;
    padding: 12px 17px;
    margin: 25px;
    font-family: 'OpenSansBold', sans-serif;
    border: 3px solid #31302B;
    font-size: 14px;
    font-weight: bold;
    letter-spacing: 1px;
    text-transform: uppercase;
    border-radius: 2px;
    display: inline-block;
    text-align: center;
    cursor: pointer;
    animation: animate-out 0.5s 1;
	  animation-fill-mode:forwards;
}
.button_sliding_bg:hover {
    animation: animate-in 0.5s 1;
	animation-fill-mode:forwards;
}

@keyframes animate-in {
	0% {
		box-shadow: inset 0 0 0 0 #31302B;
		color:#31302B;
	    background: #FFF;
	}
	100% {
		box-shadow: inset 100px 0 0 0 #31302B;
		color:#FFF;
	    background: #FFF;
	}
}
@keyframes animate-out {
	0% {
		box-shadow: inset 0 0 0 0 #FFF;	
	    background: #31302B;
		color:#FFF;
	}
	100% {
		box-shadow: inset 100px 0 0 0 #FFF;	
	    background: #31302B;
		color:#31302B;
	}
}

<button id="btn" class="button_sliding_bg">
Button
</button>

Answer 1

如果你不介意它在页面加载时运行第一个，你可以使用CSS3的animation属性来获得你想要实现的目标。诀窍是在悬停时更改animation-name和使用animation-fill-mode来保持所做的更改。请记住，CSS3的动画被视为＆＃34; experimental＆＃34;但是，它在最新的浏览器版本上有almost complete coverage。

<强> JSFIDDLE

<强> CSS

.button_sliding_bg {
    padding: 12px 17px;
    margin: 25px;
    font-family: 'OpenSansBold', sans-serif;
    border: 3px solid #31302B;
    font-size: 14px;
    font-weight: bold;
    letter-spacing: 1px;
    text-transform: uppercase;
    border-radius: 2px;
    display: inline-block;
    text-align: center;
    cursor: pointer;
    animation-name: animate-out;
    animation-duration: 0.5s;
    animation-repeat-count: 1;
    animation-fill-mode: forwards;
}
.button_sliding_bg:hover {
    animation-name: animate-in;
}

@keyframes animate-in {
    0% {
        box-shadow: inset 0 0 0 0 #31302B;
        color:#31302B;
        background: #FFF;
    }
    100% {
        box-shadow: inset 100px 0 0 0 #31302B;
        color:#FFF;
        background: #FFF;
    }
}
@keyframes animate-out {
    0% {
        box-shadow: inset 0 0 0 0 #FFF; 
        background: #31302B;
        color:#FFF;
    }
    100% {
        box-shadow: inset 100px 0 0 0 #FFF; 
        background: #31302B;
        color:#31302B;
    }
}