react项目经典报错 , 且一直弹出
Warning: Maximum update depth exceeded. This can happen when a component calls setState inside useEffect, but useEffect either doesn't have a dependency array, or one of the dependencies changes on every render


原因 : 因为用useEffect监听的依赖项在每次渲染时都变化 , 触发了无限更新 , 也就是useEffect监听的依赖项和useEffect的内容不符 !!!
 

  useEffect(() => {
    if (isSelectAll) {
      setSelectedRowKeys(data.map(item => item.key))
    } else {
      setSelectedRowKeys([])
    }
  }, [selectedRowKeys])   // 写太快了,监听的依赖项写错了,应该是监听isSelectAll

就解决问题了
 

  useEffect(() => {
    if (isSelectAll) {
      setSelectedRowKeys(data.map(item => item.key))
    } else {
      setSelectedRowKeys([])
    }
  }, [isSelectAll])