湛江市国外网站建设报价谷歌seo优化排名
现象
修改antd的Col组件的layouts属性为span后，并通过监听resize事件对span列宽进行动态变化时，报错TypeError: Cannot read properties of undefined (reading ‘then‘)。
补充示例一
由于我使用了飞冰ice.js，且在以下过程中写了如下语句，引起了同样的报错！
import { useRequest as useRequestHook } from 'ice';const { data } = useRequest(() => wareHouseModel.data && homeService.getAllFixedAssets(wareHouseModel.data, tenantCode),{manual: false,withFullResult: true,refreshDeps: [wareHouseModel.data],ready: !!tenantCode,},);
关键报错代码：
wareHouseModel.data && homeService.getAllFixedAssets(wareHouseModel.data, tenantCode),
正是因为wareHouseModel.data &&的与逻辑引起了该TypeError: Cannot read properties of undefined (reading ‘then‘)报错，因为如果wareHouseModel.data没有值，会导致返回的是非promise的对象！！！
antd引起该错误的代码示例二
const Home = () => {const [colSpan, setColSpan] = React.useState<number>(12);React.useLayoutEffect(() => {// 自适应每屏显示坐标点数量设置const resizeColSpan = () => {const width = window.innerWidth || document.documentElement.clientWidth || document.body.clientWidth;let spanNum = 0;if (+width >= 1415 && +width < 1850) {spanNum = 8;}if (+width >= 1850) {spanNum = 6;}setColSpan(spanNum);};// 初始时需要触发resize，否则会有样式兼容问题resizeColSpan();const onResize = debounce(() => {resizeColSpan();}, 50);window.addEventListener('resize', onResize);return () => {window.removeEventListener('resize', onResize);};}, []);
// ...以下省略部分内容
return ({/* <Col {...layouts} className={`${styles['panel-item']} panel-item`}> */}<Col span={colSpan} className={`${styles['panel-item']} panel-item`}>{React.isValidElement(children) &&React.cloneElement(children as React.ReactElement, {onClick: (actionKey) => handleClick(actionKey, item),hasRemoved: panelList.length >= 3,})}</Col>);
报错原因
由于上面的代码给了一个let spanNum = 0;，默认给0的情况会引起获取不到元素的报错。将其赋值为let spanNum = 12;即可。