Mini player when writing vue-music project, deleting any song from the list has no transitional effect.
html section

the key id of li has been added. You can delete a song, but it still has no transition effect. The effect is very stiff.

css:

.list-enter-active, .list-leave-active {

transition: all 0.1s linear;

}
.list-enter, .list-leave-to {

height: 0;

}