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Basic API cognition of node learning
2021-08-27 05:45:02 【_ Ride the wind_】
This is my participation 8 The fourth of the yuegengwen challenge 23 God , Check out the activity details :8 Yuegengwen challenge
process.nextTick()
- node Each time a complete trip is made in the event cycle , We all call it a
Tick tock
. - When a function is passed to process.nextTick() when , Indicates that the engine is at the end of the current operation ( Before the next event cycle starts ) Call this function when .( Be similar to vue Of $nextTick)
process.nextTick(() => {
// What needs to be done
})
Copy code
The event loop is processing the current function code .
When the operation ends ,js The engine will run and pass it to nextTick All functions called .
This way, , You can tell js The engine needs to do something as soon as possible .
and setTimeout The function is executed at the end of the next tick , Than using nextTick() Much later .
When you want to ensure that the code has been executed in the next event loop iteration , Then use nextTick()
.
setImmediate()
- When you want to asynchronously ( But as soon as possible ) When executing some code , One option is to use Node.js Provided
setImmediate()
function - As setImmediate() Any function passed in by the parameter is a callback executed in the next iteration of the event loop .
- Pass to
process.nextTick()
In the current iteration of the event loop ( After the current operation ) Be performed . This means that it will always besetTimeout
andsetImmediate
Before execution . setTimeout
andsetImmediate
All belong to macro tasks .setImmediate()
( It is equivalent to usingsetTimeout(() => {}, 0)
)
setTimeout and setInterval
-
setTimeout
Will delay the function n Seconds later . -
setTimeout
It will return to the timer id. It is not normally used , But you can save this id, And clear it when the scheduled function is to be deleted -
setInterval
Every time n MS starts a function , andThere is no need to consider when the function completes execution
. In this way, it may cause , A longer execution will overlap with the next execution .To avoid that
, You can schedule the recursive... To be called when the callback function completes setTimeout
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