shenweishi/node_modules/@vant/weapp/dist/radio-group/index.js

import { VantComponent } from '../common/component';
import { useChildren } from '../common/relation';
VantComponent({
    field: true,
    relation: useChildren('radio'),
    props: {
        value: {
            type: null,
            observer: 'updateChildren',
        },
        direction: String,
        disabled: {
            type: Boolean,
            observer: 'updateChildren',
        },
    },
    methods: {
        updateChildren() {
            this.children.forEach((child) => child.updateFromParent());
        },
    },
});