不取余的话，那么有几个颜色就会显示几个颜色，取余的话，可以给多个图片循环不同的这八个颜色
<div :style="`background-color:${color[index % 8]}`"></div>
color: [
"rgba(92, 30, 121, .8)",
"rgba(41, 36, 90, .8)",
"rgba(44, 41, 42, .8)",
"rgba(219, 151, 90, .8)",
"rgba(255, 106, 0, .8)",
"rgba(79, 71, 171, .8)",
"rgba(49, 64, 119, .8)",
"rgba(19, 139, 110, .8)",
],
