Directory Custom instructions Example 1 Example 2 hook function The relationship between custom instructions and hook functions This article mainly introduces the use of custom instructions and hook functions in Vue3 and the relationship between them. Custom directive In Vue3, custom directives are a way to extend Vue’s template syntax. Custom directives are actually a […]
Tag: unmount
Automatic mounting and unmounting of U disk in polling mode under Linux
There is a better way to automatically mount a USB flash drive under Linux. I have recorded a relatively simple and crude way. 1. Find whether there is a USB flash drive device 1.1 Check whether there is “sd” string in the /proc/diskstats file. If it exists, proceed to the next step. 1.2 Obtain the […]
Bug Resolved – Warning: Cant call setState (or forceUpdate) on an unmounted component (React)
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Compile and burn SPI-NOR-Flash V3s core board (5): automatically mount/unmount U disk
In the last article: Compile and burn SPI-NOR-Flash V3s core board (4): USB extension, a topic left over is how to make the system automatically mount the U disk when the USB interface is inserted Partition, when the U disk is pulled out, it will automatically uninstall the partition of the U disk. Here is […]
How to use the diskutil command on the terminal to mount and unmount the external hard disk on Mac
Recently, when using macOS to mount an external hard drive, I couldn’t mount it using mount. Many articles didn’t describe various situations in detail, so I wrote a blog to record it. How to mount and unmount hard disk (or partition) mount and umount cannot be used on macOS, if used, it will display unknown […]
[Solved] The solution to unmount the react component created by the createRoot() method when calling the ReactDOM.unmountComponentAtNode() method to report an error
When uninstalling the top-level component directly mounted in index.html, the following two errors occurred: Warning: You are calling ReactDOM.unmountComponentAtNode() on a container that was previously passed to ReactDOMClient.createRoot(). This is not supported. Did you mean to call root.unmount()? Warning: You are calling ReactDOM.unmountComponentAtNode() on a > container that was previously passed to ReactDOMClient.createRoot(). > This […]
[Solved] react error: Can’t perform a React state update on an unmounted component
wrong reason: If an asynchronous operation is performed after the component is mounted (mounted), such as an ajax request or a timer is set, and you perform a setState operation in the callback, the component has been unmounted, At this point, the callback in the asynchronous operation is still executing, so setState does not get […]
[Solved] React hooks functional component solution: Can’t perform a React state update on an unmounted component
const [value, setValue] = useState(”); //…. useEffect(() => {<!– –> fetchValue().then(() => {<!– –> setValue(“fetch_done!”); // triggers react memory leak }); }, []); Workaround useEffect(() => {<!– –> fetchValue().then(() => {<!– –> setValue(“done!”); // triggers react memory leak //add }); return ()=>setValue(”) //Return the problem setstate to the default value }, []); Lifecycle useEffect(() => […]