1. propTypes 空数组报undefined Warning
举例来说:
import React from 'react';
import { Breadcrumb, Icon } from 'antd';
import PropTypes from 'prop-types'
const BreadcrumbBlock = ({ paths }) => {
const items = paths.map( (path, index) => (
<Breadcrumb.Item key={index+1}>
<span>{path}</span>
</Breadcrumb.Item>
));
return (
<Breadcrumb separator='>'>
<Breadcrumb.Item key="0">
<Icon type="home"/>
</Breadcrumb.Item>
{items}
</Breadcrumb>
);
}
Breadcrumb.propTypes = {
paths: PropTypes.array.isRequired
}
export default BreadcrumbBlock;
如果针对paths =[],则console会报warning:指示paths 的值是undefined,原来如果设置isRequired属性,空值也默认是undefined,去掉后一切正常。
Breadcrumb.propTypes = {
paths: PropTypes.array
}