index.js

import { VantComponent } from '../common/component';
VantComponent({
    relation: {
        name: 'row',
        type: 'ancestor',
        current: 'col',
    },
    props: {
        span: Number,
        offset: Number
    },
    data: {
        viewStyle: ''
    },
    methods: {
        setGutter(gutter) {
            const padding = `${gutter / 2}px`;
            const viewStyle = gutter ? `padding-left: ${padding}; padding-right: ${padding};` : '';
            if (viewStyle !== this.data.viewStyle) {
                this.setData({ viewStyle });
            }
        }
    }
});