pad-app/wxcomponents/vant/dist/mixins/basic.js

export const basic = Behavior({
    methods: {
        $emit(name, detail, options) {
            this.triggerEvent(name, detail, options);
        },
        set(data) {
            this.setData(data);
            return new Promise((resolve) => wx.nextTick(resolve));
        },
    },
});