我刚刚安装了styled-components
库并开始使用它。
但是这个简单的例子:
import React from 'react'
import styled from 'styled-components'
const Div = styled.div`background: red;`
const AlertCard = () => (
<Div>Hello World</Div>
)
export default AlertCard
渲染功能:
render() {
const { fetchingAlerts, alerts } = this.props
return (
fetchingAlerts ?
<Loader /> :
<div>
<AlertFormContainer />
<div>
{alerts.length === 0 ?
<EmptyAlerts /> :
<div>
{alerts.map(alert => (
<AlertCard text="My text " />
))}
</div>
}
</div>
</div>
)
)
}
触发此错误:Error: Element type is invalid: expected a string (for built-in components) or a class/function (for composite components) but got: object.
样式化的组件返回$$typeof: Symbol(react.element)
对象
我不知道怎么了
答案 0 :(得分:3)
您使用哪个版本的React,React-Dom和Styled-Component?
确保带有样式组件> = 4.0.0的react 和 react-dom为> = 16.3.0
在样式化组件v4中使用新的Context API带来的重大变化要求react> = 16.3.0
参见https://www.styled-components.com/docs/faqs#what-do-i-need-to-do-to-migrate-to-v4上的#2点