//代码实现
<div class="xjgl-btn-box">
<a href="#">
<span></span>
<span></span>
<span></span>
<span></span>
按钮
</a>
</div>
.xjgl-btn-box a {
position: relative;
display: inline-block;
padding: 10px 20px;
color: #666;
font-size: 16px;
text-decoration: none;
text-transform: uppercase;
overflow: hidden;
transition: .5s;
margin-top: 40px;
letter-spacing: 4px;
}
.xjgl-btn-box a span {
position: absolute;
display: block;
}
.xjgl-btn-box a span:nth-child(1) {
top: 0;
left: -100%;
width: 100%;
height: 2px;
background: linear-gradient(90deg, transparent, #03e9f4);
animation: btn-anim1 1s linear infinite;
}
@keyframes btn-anim1 {
0% {
left: -100%;
}
50%,
100% {
left: 100%;
}
}
.xjgl-btn-box a span:nth-child(2) {
top: -100%;
right: 0;
width: 2px;
height: 100%;
background: linear-gradient(180deg, transparent, #03e9f4);
animation: btn-anim2 1s linear infinite;
animation-delay: .25s
}
@keyframes btn-anim2 {
0% {
top: -100%;
}
50%,
100% {
top: 100%;
}
}
.xjgl-btn-box a span:nth-child(3) {
bottom: 0;
right: -100%;
width: 100%;
height: 2px;
background: linear-gradient(270deg, transparent, #03e9f4);
animation: btn-anim3 1s linear infinite;
animation-delay: .5s
}
@keyframes btn-anim3 {
0% {
right: -100%;
}
50%,
100% {
right: 100%;
}
}
.xjgl-btn-box a span:nth-child(4) {
bottom: -100%;
left: 0;
width: 2px;
height: 100%;
background: linear-gradient(360deg, transparent, #03e9f4);
animation: btn-anim4 1s linear infinite;
animation-delay: .75s
}
@keyframes btn-anim4 {
0% {
bottom: -100%;
}
50%,
100% {
bottom: 100%;
}
}
