效果图：

用了SCSS来写，如果不太熟悉的话，可以看CSS。话不多说，直接上代码

index.html

loading.scss

// 线条总数

$total: 13;

// 每个线条相差的角度

$angel: 180/($total - 1);

.loading {

background: black;

width: 400px;

height: 400px;

position: relative;

div {

position: absolute;

display: block;

width: 100%;

height: 2px;

top: 50%;

transform-origin: 50% 50%;

&:before {

display: block;

content: "";

height: 100%;

width: 10%;

background: white;

}

@for $i from 1 through $total {

&:nth-child(#{$i}) {

transform: translate3d(0, -50%, 0) rotate(#{$angel*($i - 1)}deg);

opacity: 0.2 + 0.8 * $i / $total;

}

}

}

}

loading.css

.loading {

background: black;

width: 400px;

height: 400px;

position: relative;

}

.loading div {

position: absolute;

display: block;

width: 100%;

height: 2px;

top: 50%;

transform-origin: 50% 50%;

}

.loading div:before {

display: block;

content: "";

height: 100%;

width: 10%;

background: white;

}

.loading div:nth-child(1) {

transform: translate3d(0, -50%, 0) rotate(0deg);

opacity: 0.26154;

}

.loading div:nth-child(2) {

transform: translate3d(0, -50%, 0) rotate(15deg);

opacity: 0.32308;

}

.loading div:nth-child(3) {

transform: translate3d(0, -50%, 0) rotate(30deg);

opacity: 0.38462;

}

.loading div:nth-child(4) {

transform: translate3d(0, -50%, 0) rotate(45deg);

opacity: 0.44615;

}

.loading div:nth-child(5) {

transform: translate3d(0, -50%, 0) rotate(60deg);

opacity: 0.50769;

}

.loading div:nth-child(6) {

transform: translate3d(0, -50%, 0) rotate(75deg);

opacity: 0.56923;

}

.loading div:nth-child(7) {

transform: translate3d(0, -50%, 0) rotate(90deg);

opacity: 0.63077;

}

.loading div:nth-child(8) {

transform: translate3d(0, -50%, 0) rotate(105deg);

opacity: 0.69231;

}

.loading div:nth-child(9) {

transform: translate3d(0, -50%, 0) rotate(120deg);

opacity: 0.75385;

}

.loading div:nth-child(10) {

transform: translate3d(0, -50%, 0) rotate(135deg);

opacity: 0.81538;

}

.loading div:nth-child(11) {

transform: translate3d(0, -50%, 0) rotate(150deg);

opacity: 0.87692;

}

.loading div:nth-child(12) {

transform: translate3d(0, -50%, 0) rotate(165deg);

opacity: 0.93846;

}

.loading div:nth-child(13) {

transform: translate3d(0, -50%, 0) rotate(180deg);

opacity: 1;

}