miniprogram/node_modules/@vant/weapp/dist/picker/index.js

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import { VantComponent } from '../common/component';
import { pickerProps } from './shared';
VantComponent({
    classes: ['active-class', 'toolbar-class', 'column-class'],
    props: Object.assign(Object.assign({}, pickerProps), { valueKey: {
            type: String,
            value: 'text',
        }, toolbarPosition: {
            type: String,
            value: 'top',
        }, defaultIndex: {
            type: Number,
            value: 0,
        }, columns: {
            type: Array,
            value: [],
            observer(columns = []) {
                this.simple = columns.length && !columns[0].values;
                if (Array.isArray(this.children) && this.children.length) {
                    this.setColumns().catch(() => { });
                }
            },
        } }),
    beforeCreate() {
        Object.defineProperty(this, 'children', {
            get: () => this.selectAllComponents('.van-picker__column') || [],
        });
    },
    methods: {
        noop() { },
        setColumns() {
            const { data } = this;
            const columns = this.simple ? [{ values: data.columns }] : data.columns;
            const stack = columns.map((column, index) => this.setColumnValues(index, column.values));
            return Promise.all(stack);
        },
        emit(event) {
            const { type } = event.currentTarget.dataset;
            if (this.simple) {
                this.$emit(type, {
                    value: this.getColumnValue(0),
                    index: this.getColumnIndex(0),
                });
            }
            else {
                this.$emit(type, {
                    value: this.getValues(),
                    index: this.getIndexes(),
                });
            }
        },
        onChange(event) {
            if (this.simple) {
                this.$emit('change', {
                    picker: this,
                    value: this.getColumnValue(0),
                    index: this.getColumnIndex(0),
                });
            }
            else {