applte/components/dist/transition/index.js

import { VantComponent } from '../common/component';
import { transition } from '../mixins/transition';
VantComponent({
    classes: [
        'enter-class',
        'enter-active-class',
        'enter-to-class',
        'leave-class',
        'leave-active-class',
        'leave-to-class',
    ],
    mixins: [transition(true)],
});