wxhuanart/miniprogram/miniprogram_npm/tdesign-miniprogram/transition/transition.wxss

.t-transition-enter {
  opacity: 0;
}
.t-transition-enter-to {
  opacity: 1;
  transition: opacity 1s;
}
.t-transition-leave {
  opacity: 1;
}
.t-transition-leave-to {
  opacity: 0;
  transition: opacity 1s;
}