vant-weapp/dist/switch/index.js

import { VantComponent } from '../common/component';
VantComponent({
    field: true,
    classes: ['node-class'],
    props: {
        checked: Boolean,
        loading: Boolean,
        disabled: Boolean,
        size: {
            type: String,
            value: '30px'
        }
    },
    watch: {
        checked(value) {
            this.setData({ value });
        }
    },
    created() {
        this.setData({ value: this.data.checked });
    },
    methods: {
        onClick() {
            if (!this.data.disabled && !this.data.loading) {
                const checked = !this.data.checked;
                this.$emit('input', checked);
                this.$emit('change', checked);
            }
        }
    }
});