/* 不精准 */
.router-link-active {
  position: relative;
  color: hsl(280deg, 100%, 90%);
}

.router-link-active::before {
  content: "";
  position: absolute;
  width: 3px;
  height: 100%;
  background: hsl(280deg, 100%, 70%);
  left: -14px;
}
/* 精准 */
.router-link-exact-active {
  position: relative;
  color: hsl(280deg, 100%, 90%);
}

.router-link-exact-active::before {
  content: "";
  position: absolute;
  width: 3px;
  height: 100%;
  background: hsl(280deg, 100%, 70%);
  left: -14px;
}