Javascript some。 SitePoint

SitePoint

javascript some

Create a Simple Delay Using setTimeout The standard way of creating a delay in JavaScript is to use its setTimeout method. log "Hello! while loop. World! It then creates an empty currentDate variable, before entering a do... " ; It will log: Hello Goodbye! Sorted! log "Goodbye! It will not, however, wait for the request to complete. Luckily, the language has evolved considerably over the past few years and now offers us new constructs to avoid this. " ; The code above logs the following: Hello Goodbye! log json. We can also chain more callbacks onto the first: console. log "World! log "Hello! json ; console. Try altering the previous code like so: console. log "Hello" ; await sleep 2000 ; console. World! log "World! However, please be aware that setTimeout is an asynchronous method. This is because fetching data from an API is an asynchronous operation in JavaScript. For example: console. parse Net::HTTP. The loop will keep going while the difference between date and currentDate is less than the desired delay in milliseconds. log "Goodbye! So what to do? Job done, right? The JavaScript interpreter will encounter the fetch command and dispatch the request. We can pretty it up using async... log "World! github. github. If you have any questions, please head over to the and start a discussion. json. log "Hello" ; sleep 2000. The example above uses an anonymous callback function for this purpose, but if you need to wait for multiple things to happen, the syntax quickly gets pretty gnarly and you end up in. log "Hello" ; sleep 2000 ; console. github. log "Hello" ; await sleep 2000 ; console. " ; await sleep 2000 ; console. This functionality is absent from JavaScript, however, owing to its asynchronous nature. " As one might expect, this code makes a request to the GitHub API to fetch my user data. Also, by way of further reading, check out these links, which inspired some of the code in this article:• log "Goodbye! log json. Notice that we need to use a then callback to make sure the second message is logged with a delay. Of course, both of these methods still have the disadvantage or feature that they do not pause the entire program execution. log "World! In the loop it repeatedly gets the number of milliseconds which have elapsed since January 1, 1970 and assigns the value to the previously declared currentDate variable. log "Hello" ; sleep 2000. log "World! Develop a deeper understanding of JavaScript with. log "World! Execution goes from top to bottom. log "World! See the Pen by SitePoint on. querySelector 'my-element' ; if el. log "Goodbye! If any of this is news to you, you should watch this excellent conference talk:.。 。 。 。 。 。

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