vant-weapp/dist/radio/index.js

import { VantComponent } from '../common/component';
VantComponent({
    field: true,
    relation: {
        name: 'radio-group',
        type: 'ancestor',
        current: 'radio',
    },
    classes: ['icon-class', 'label-class'],
    props: {
        value: null,
        disabled: Boolean,
        useIconSlot: Boolean,
        checkedColor: String,
        labelPosition: {
            type: String,
            value: 'right'
        },
        labelDisabled: Boolean,
        shape: {
            type: String,
            value: 'round'
        },
        iconSize: {
            type: null,
            value: 20
        }
    },
    methods: {
        emitChange(value) {
            const instance = this.parent || this;
            instance.$emit('input', value);
            instance.$emit('change', value);
        },
        onChange() {
            if (!this.data.disabled) {
                this.emitChange(this.data.name);
            }
        },
        onClickLabel() {
            const { disabled, labelDisabled, name } = this.data;
            if (!disabled && !labelDisabled) {
                this.emitChange(name);
            }
        }
    }
});