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It's because of your IDE! Make sure you have added automatic imports such as If so, remove them. 阅读全文
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function timestampToTime(timestamp) { var date = new Date(timestamp * 1000); //timestamp 为10位需*1000，timestamp 为13位的话不需乘1000 var Y = date.getFullYear() 阅读全文
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index.js: import React from 'react'; import ReactDOM from 'react-dom'; import CardSecond from './CardSecond'; import './index.css'; ReactDOM.render( < 阅读全文
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location 有可能是一个‘’，''.split() 将输出[""]，是个含有空字符串的数组，而[]是个什么都没有的数组，两者不同。 code: change initialValue from : initialValue: location.split(',') || [] to: init 阅读全文