When opening a window with a notice. In a UI (user interface) thread, it blocks the user interface. I need it to wait 5 seconds before checking whether the newState is -1. In what way didn't it work? In the date and time method, our seconds and milliseconds are set to 0. However, JS has setTimeout () function, which can delay an action. { This code will generate a timer that will start running until it reaches the peak then redirect the user. What code should wait 5 seconds? For example, setting an implicit wait of 10 seconds and an explicit wait of 15 seconds could cause a timeout to occur after 20 seconds. Well, that’s fine. This is a free user-friendly kind of program, you can modify it and apply to … There is a command to jump from one line of the program to another, called GOTO. It is all about keeping the CPU busy for the desired amount of time. But we should thank promises and async/await function in ES 2018. Last Updated : 17 Sep, 2019 JavaScript, unlike other languages, does … The functions you specify don't have to be anonymous. { I have a Javascript function that displays a DIV with 2 buttons inside. Avril 2013. Is there a way to do this? Understanding JavaScript setTimeout () To make JavaScript wait, use setTimeout () function with JavaScript promise. This tutorial will explain how we can wait for x seconds before continuing the execution in JavaScript. Tip: 1000 ms = 1 second. We will implement a delay(seconds) function that will block the thread for x seconds. The promise is rejected when there is an uncaught exception … To redirect a webpage after 5 seconds, use the setInterval() method to set the time interval. Créé: December-27, 2020 . var d = new Date(); sleep / wait / pause en Javascript. Code language: JavaScript (javascript) In this syntax: cb is a callback function to be executed after the timer expires. Currently, it doesn’t wait, it just checks straight away. Posted by: admin November 23, 2017 Leave a comment. Let’s write a small program to understand how wait(), notify(), notifyall() methods should be used to get desired results.. 2. DelftStack is a collective effort contributed by software geeks like you. Submitted by razormist on Tuesday, August 14, 2018 - 21:45. console.log(audio.currentTime); This line will print the audio playing current time in the console log and this is not mandatory. The … JavaScript do not have a function like pause or wait in other programming languages. Wait for User to Stop Typing, in JavaScript. You need wait 4 seconds to see the calculation result. Questions: This function below doesn’t work like I want it to – being a JS novice I can’t figure out why. Tip: The function is only executed once. This makes for … Javascript delay / wait / pause script Some background on this Javascript code My first programming language was Basic. I have read and tried both setTimeOut() and setInterval() and they don't seem to be what I need. The delay begins at the moment where setTimeout is executed by the JavaScript interpreter, so from the loading of the page if the instruction is in a script executed at load, or from a user action if the script is triggered by it. Following example will popup an alert 4 seconds after you click the "Test Code" The task is technically very simple, but the question is quite common for developers new to async/await. JavaScript - Wait 5 Seconds To Redirect. Everything has to be done with functions which take callbacks such as setTimeout which others have mentioned. }. Now if you try to use for loop on myitems array and call itemRunner, it will not wait itemRunners response. In this tutorial we’ll explain how these two methods work, and … The real time suspended is equal to the given time divided by Time.timeScale. The time given in the parameter is in the unit of ms. One method to implement the delay function in the asynchronous context is to combine async/await concept and promises concept. Use the setTimeout () to Wait for X Seconds in JavaScript The asynchronous setTimeout () method is one of the higher-order functions that takes a callback function as an argument, and it executes that function after the input time elapsed. Oh well, i think at that time they din bother to add them or din feel the requirement. Here is the code I have: The asynchronous setTimeout() method is one of the higher-order functions that takes a callback function as an argument, and it executes that function after the input time elapsed. Using increasing timeouts works because the code is all executed at the same time, so the specified callback functions will be executed 1, 2, and 3 seconds … Following example will popup an alert 4 seconds after you click the "Test Code" button: 1 Let’s assume that we have a for loop that prints 0 to 10 at random intervals (0 to n seconds). It can only be used inside an async function within regular JavaScript code; however it can be used on it's own with JavaScript modules. It returns an identifier for the process. Hi, I am using a java web resource embedded onto a form. This is working like this. Normally, we do this with setTimeout(). Utilisez la fonction setTimeout() pour attendre X secondes en JavaScript ; Utilisez promises et async/await pour attendre X secondes en JavaScript ; Utiliser la boucle for pour implémenter la fonction delay synchrone en JavaScript ; Ce tutoriel expliquera comment nous pouvons attendre x secondes avant de poursuivre l’exécution en JavaScript. The setTimeout above schedules the next call right at the end of the current one (*).. Sleep should be successful. If you like the article and would like to contribute to DelftStack by writing paid articles, you can check the, Check if Element Exists in DOM in JavaScript, Check if Key Exists in Object in JavaScript, Generate a Random Number Between Two Numbers in JavaScript, Capitalize the First Letter of a String in JavaScript. These examples will also make use of a new-ish JS feature, arrow functions. The setTimeoutmethod defines an action to perform and a delay before its execution. However, JS has setTimeout() function, which can delay an action. Javascript – Wait 5 seconds before executing next line . Again, this matters more on something that is not a personal site. In the following example, the browser will wait two seconds before executing the anonymous function, then will display the alert message (see it running live, and see the source code):let myGreeting = setTimeout (function {alert ('Hello, Mr. See WaitForSecondsRealtime if you wish to wait using unscaled time. To delay a function call, use setTimeout() function. Cons: It wastes 10 more seconds of processing time on this thread, when it might have something better to do with its cycles. Suspends the coroutine execution for the given amount of seconds using scaled time. ClearTimeout interrupts the count of setTimeout if you mean the HTML code to display after 5 seconds, set its CSS display to none and after 5 seconds set it to the … But what if you want to so something 10 times, and delay 3 seconds between iterations? Now if you try to use for loop on myitems array and call itemRunner, it will not wait itemRunners response. Why waste the users time? However, the order cannot be changed, so keep that in mind if you decide to leave off a number. The setTimeout() method calls a function or evaluates an expression after a specified number of milliseconds. do { d2 = new Date(); } In programming languages such as C and Php we would call sleep(sec).Java has thread.sleep(), python has time.sleep() and GO has time.Sleep(2 * time.Second).. javascript doesn't have these kinds of sleep functions. window.setTimeout() allows you to specify that a piece of JavaScript code (called an expression) will be run a specified number of milliseconds from when the setTimeout() method was called. WaitForSeconds can only be used with a yield statement in coroutines. If any number is missing from the Date creation, it will default to 0. When we talk about implementing a delay function, the most widely used method is the asynchronous setTimeout(). An implicit wait is to tell WebDriver to poll the DOM for a certain amount of time when trying to find an element or elements if they are not immediately available. If you omit it, the delay defaults to 0. setTimeout(functionname, milliseconds, arg1, arg2, arg3...) The following are the parameters − How to add sleep/wait function before continuing in JavaScript? Many thanks to Michael Andrews who adapted my original code for seconds to make it work for milliseconds and Artur Kraft who sent me this code, which is more elegant than my original solution was. They do not want to wait 10 seconds when they do not have too. There are many good intros to async/await available, so I won’t go into a full discussion here, but the 15 sec. We need to modify it using promises to print sequentially 0 to 10. The above code will not do what you want, though. It will just call and move to next time and print 1,2,3 in console after three seconds. alert(x); The third method is what I suggest doing: Remove the timer. Originally published by Just Chris on November 11th 2017 157,750 reads @jsborkedJust Chris. Simply click the demo link and wait for five seconds to display the alert: See online demo and code. However, Sleep should be used carefully. JavaScript is a scripting or programming language that allows you to implement complex things on web pages. We need to modify it using promises to print sequentially 0 to 10. This quickly falls apart, however, because users easily type faster than your server can respond. Universe! It means that if you specify duration to be, say, 1 second, JavaScript does not guarantee that it will start running the code after the sleep exactly after 1 second. This window will close automatically within 10 second(s) > Count down … Well organized and easy to understand Web building tutorials with lots of examples of how to use HTML, CSS, JavaScript, SQL, PHP, Python, Bootstrap, Java and XML. Run JavaScript code or call a function after n seconds. The code works like so: The setTimeout function is queued immediately for future execution (after 3 seconds) The for loop moves on to the next iteration right away So for example $(element).delay(3000).fadeIn(250); will make the element fade in after 3 seconds. popup an alert box, otherwise do nothing: You need to wait 4 seconds to see the alert box. But we don’t want this. Following example will delay 4 seconds, then popup a confirm box, if the user clicks "OK", You may also notice that the month of July is represented by 6… The function will be executed after 5 seconds (5000 milliseconds). Sleep() With the help of Sleep() we can make a function to pause execution for a fixed amount of time. while(d2-d < ms); After that, we can call that delay function inside any asynchronous context as we like.eval(ez_write_tag([[728,90],'delftstack_com-medrectangle-3','ezslot_5',113,'0','0'])); The delay function can also be Optimized using the arrow syntax in ECMAScript 6 as the following example: Suppose we don’t have any asynchronous context to use the above delay() function or don’t want to use the setTimeout() function. But JavaScript does not have that native function. Body. Tip: Use the clearTimeout() method to prevent the function from running. // we need to call async wait() and wait to get 10 // remember, we can't use "await" } P.S. For example, if 0 takes 6 seconds to print and 1 takes two seconds to print, then 1 should wait for 0 to print and so on. The await operator is used to wait for a Promise. The setTimeout() method calls a function or evaluates an expression after a specified number of milliseconds. The two key methods to use with JavaScript are: setTimeout(function, milliseconds) Executes a function, after waiting a specified number of milliseconds. But we should thank … We want to process the array in sequence and wait for the current item to finish it’s process and then move to next item. After the DIV is shown I need the function to wait for one of the buttons to be clicked, then proceed with the rest of the code. Didn't it wait? For the demo, I have used the SweetAlert plug-in, that enable creating nice JavaScript alerts. waited for 2 seconds waited for 4 seconds This is failure callback Use of async or await() function: This method can be used if the exact time required in setTimeout() cannot be specified. Output: waited for 2 seconds waited for 4 seconds This is failure callback Use of async or await() function: This method can be used if the exact time required in setTimeout() cannot be specified. You can use Thread Sleep Method to wait for 5 mins and then redirect. How to use with wait(), notify() and notifyAll() methods. JavaScript executes linearly, one line after another. If you need to repeat execution, use the setInterval() method.. Created: November-28, 2020 | Updated: December-10, 2020. Sleep() With the help of Sleep() we can make a function to pause execution for a fixed amount of time. what happens is that after i hit submit the page tries to save and while its doing that it also tries to update the fields which in turn causes the fields not to update. For example, if 0 takes 6 seconds to print and 1 takes two seconds to print, then 1 should wait for 0 to print and so on. The async keyword is used to create an asynchronous function that returns a promise that is either rejected or resolved. The code use a setTimeout function to initiate a countDown() that decrement a value continuously when the start button is clicked. the web resource has a button labeled submit. Wait 3 seconds, and the page will alert "Hello":
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Hence it proves, even though JavaScript is single threaded, we can achieve concurrency through asynchronously handling the tasks. Now supported by a majority of client and server JS platforms, callback programming is … JavaScript features a handy couple of methods of the window object: setTimeout() and setInterval(). The purpose of jQuery’s delay() is to make an animation queue wait before executing. When I click on button I want to wait on the current page for 5 seconds before it redirect to next page. The delay begins at the moment where setTimeoutis executed by the JavaScript interpreter, so from the loading of the page if the instruction is in a script executed at load, or from a user action if the script is triggered by it. The nested setTimeout is a more flexible method than setInterval.This way the next call may be scheduled differently, depending on the results of the current one. var d2 = null; It is a text-based programming language meant to run as part of … programming languages. Hint: Use for loop to chain promises :). The general syntax of the method is: setTimeout ( expression, timeout); where expression is the JavaScript code to run after timeout milliseconds have elapsed. We need to modify it using promises to print sequentially 0 to 10. In this tutorial we will create a Wait 5 Seconds To Redirect using Javascript. On peut donc écrire setTimeout ou window.setTimeout. Beaucoup de langages de programmation permettent de mettre en pause l'exécution pendant un certain temps, comme le permet par exemple la fonction sleep() en PHP (dans d'autres langages on trouve aussi wait ou delay). Step 5: Suddenly console.log( "Siddhartha" ) is found pushed into the stack after 2 seconds as setTimeout() has timed out. Let’s assume that we have a for loop that prints 0 to 10 at random intervals (0 to n seconds). Dec 8, 2014 • 4 min read • 2037 votes Let’s say you have a search feature on your website that you want to live-update while the user types. We can create a delay function that returns a new promise inside, which we will call the setTimeout() method with our desired waiting time. We will also explain multiple implementation techniques for this delay. Javascript – Wait 5 seconds before executing next line . In this exercise, we will solve producer consumer problem using wait() and notify() methods. Let’s make a JavaScript Wait function by@jsborked. But it also has a stack, or a queue of operations to perform. Definition and Usage. Async/await and its underlying use of promises are taking the JS world by storm. The async keyword is used to create an asynchronous function that returns a promise that is either rejected or resolved. I've heard it said that this command is never needed (in Basic) if you're writing structured programs and programming properly. Thanks also to André Pirard for untwisting the variable declarations. Let's write a wait function: function wait(ms) I used javascript for this and simply complete this. I am working on a project "Accounts & Inventory Management System" Here needs a javascript auto close window after 10 seconds. ');}, 2000). These let you run a piece of JavaScript code at some point in the future. Let’s assume that we have a for loop that prints 0 to 10 at random intervals (0 to 6 seconds). So after 5 seconds, the audio will be stopped automatically. In that case, we can implement a synchronous delay function with a normal for loop and Date() class to calculate time. Questions: This function below doesn’t work like I want it to – being a JS novice I can’t figure out why. Note how I wrote about 5 seconds, and not 5 seconds. In this tutorial we will create a Redirect After 5 Seconds using JavaScript. There is a requirement to implement sleep(), wait() or delay()… Each await call will wait for the previous one to return a result. JavaScript do not have a function like pause or wait in other x = x * 1000 + 67; In the if condition I set it to greater than 45. long anticipated JavaScript feature that makes working with asynchronous functions much more enjoyable and easier to understand JavaScript code to implement the timer: The naive implementation would be to send a query to your server on every keystroke. Example: The function will be executed after 5 seconds (5000 milliseconds). setTimeout() Example. Since we are doing one call at a time the entire function will take 9 seconds from start to finish (2+4+3). Doing so can cause unpredictable wait times. > When opening a window with a notice. In a UI (user interface) thread, it blocks the user interface. I need it to wait 5 seconds before checking whether the newState is -1. In what way didn't it work? In the date and time method, our seconds and milliseconds are set to 0. However, JS has setTimeout () function, which can delay an action. { This code will generate a timer that will start running until it reaches the peak then redirect the user. What code should wait 5 seconds? For example, setting an implicit wait of 10 seconds and an explicit wait of 15 seconds could cause a timeout to occur after 20 seconds. Well, that’s fine. This is a free user-friendly kind of program, you can modify it and apply to … There is a command to jump from one line of the program to another, called GOTO. It is all about keeping the CPU busy for the desired amount of time. But we should thank promises and async/await function in ES 2018. Last Updated : 17 Sep, 2019 JavaScript, unlike other languages, does … The functions you specify don't have to be anonymous. { I have a Javascript function that displays a DIV with 2 buttons inside. Avril 2013. Is there a way to do this? Understanding JavaScript setTimeout () To make JavaScript wait, use setTimeout () function with JavaScript promise. This tutorial will explain how we can wait for x seconds before continuing the execution in JavaScript. Tip: 1000 ms = 1 second. We will implement a delay(seconds) function that will block the thread for x seconds. The promise is rejected when there is an uncaught exception … To redirect a webpage after 5 seconds, use the setInterval() method to set the time interval. Créé: December-27, 2020 . var d = new Date(); sleep / wait / pause en Javascript. Code language: JavaScript (javascript) In this syntax: cb is a callback function to be executed after the timer expires. Currently, it doesn’t wait, it just checks straight away. Posted by: admin November 23, 2017 Leave a comment. Let’s write a small program to understand how wait(), notify(), notifyall() methods should be used to get desired results.. 2. DelftStack is a collective effort contributed by software geeks like you. Submitted by razormist on Tuesday, August 14, 2018 - 21:45. console.log(audio.currentTime); This line will print the audio playing current time in the console log and this is not mandatory. The … JavaScript do not have a function like pause or wait in other programming languages. Wait for User to Stop Typing, in JavaScript. You need wait 4 seconds to see the calculation result. Questions: This function below doesn’t work like I want it to – being a JS novice I can’t figure out why. Tip: The function is only executed once. This makes for … Javascript delay / wait / pause script Some background on this Javascript code My first programming language was Basic. I have read and tried both setTimeOut() and setInterval() and they don't seem to be what I need. The delay begins at the moment where setTimeout is executed by the JavaScript interpreter, so from the loading of the page if the instruction is in a script executed at load, or from a user action if the script is triggered by it. Following example will popup an alert 4 seconds after you click the "Test Code" The task is technically very simple, but the question is quite common for developers new to async/await. JavaScript - Wait 5 Seconds To Redirect. Everything has to be done with functions which take callbacks such as setTimeout which others have mentioned. }. Now if you try to use for loop on myitems array and call itemRunner, it will not wait itemRunners response. In this tutorial we’ll explain how these two methods work, and … The real time suspended is equal to the given time divided by Time.timeScale. The time given in the parameter is in the unit of ms. One method to implement the delay function in the asynchronous context is to combine async/await concept and promises concept. Use the setTimeout () to Wait for X Seconds in JavaScript The asynchronous setTimeout () method is one of the higher-order functions that takes a callback function as an argument, and it executes that function after the input time elapsed. Oh well, i think at that time they din bother to add them or din feel the requirement. Here is the code I have: The asynchronous setTimeout() method is one of the higher-order functions that takes a callback function as an argument, and it executes that function after the input time elapsed. Using increasing timeouts works because the code is all executed at the same time, so the specified callback functions will be executed 1, 2, and 3 seconds … Following example will popup an alert 4 seconds after you click the "Test Code" button: 1 Let’s assume that we have a for loop that prints 0 to 10 at random intervals (0 to n seconds). It can only be used inside an async function within regular JavaScript code; however it can be used on it's own with JavaScript modules. It returns an identifier for the process. Hi, I am using a java web resource embedded onto a form. This is working like this. Normally, we do this with setTimeout(). Utilisez la fonction setTimeout() pour attendre X secondes en JavaScript ; Utilisez promises et async/await pour attendre X secondes en JavaScript ; Utiliser la boucle for pour implémenter la fonction delay synchrone en JavaScript ; Ce tutoriel expliquera comment nous pouvons attendre x secondes avant de poursuivre l’exécution en JavaScript. The setTimeout above schedules the next call right at the end of the current one (*).. Sleep should be successful. If you like the article and would like to contribute to DelftStack by writing paid articles, you can check the, Check if Element Exists in DOM in JavaScript, Check if Key Exists in Object in JavaScript, Generate a Random Number Between Two Numbers in JavaScript, Capitalize the First Letter of a String in JavaScript. These examples will also make use of a new-ish JS feature, arrow functions. The setTimeoutmethod defines an action to perform and a delay before its execution. However, JS has setTimeout() function, which can delay an action. Javascript – Wait 5 seconds before executing next line . Again, this matters more on something that is not a personal site. In the following example, the browser will wait two seconds before executing the anonymous function, then will display the alert message (see it running live, and see the source code):let myGreeting = setTimeout (function {alert ('Hello, Mr. See WaitForSecondsRealtime if you wish to wait using unscaled time. To delay a function call, use setTimeout() function. Cons: It wastes 10 more seconds of processing time on this thread, when it might have something better to do with its cycles. Suspends the coroutine execution for the given amount of seconds using scaled time. ClearTimeout interrupts the count of setTimeout if you mean the HTML code to display after 5 seconds, set its CSS display to none and after 5 seconds set it to the … But what if you want to so something 10 times, and delay 3 seconds between iterations? Now if you try to use for loop on myitems array and call itemRunner, it will not wait itemRunners response. Why waste the users time? However, the order cannot be changed, so keep that in mind if you decide to leave off a number. The setTimeout() method calls a function or evaluates an expression after a specified number of milliseconds. do { d2 = new Date(); } In programming languages such as C and Php we would call sleep(sec).Java has thread.sleep(), python has time.sleep() and GO has time.Sleep(2 * time.Second).. javascript doesn't have these kinds of sleep functions. window.setTimeout() allows you to specify that a piece of JavaScript code (called an expression) will be run a specified number of milliseconds from when the setTimeout() method was called. WaitForSeconds can only be used with a yield statement in coroutines. If any number is missing from the Date creation, it will default to 0. When we talk about implementing a delay function, the most widely used method is the asynchronous setTimeout(). An implicit wait is to tell WebDriver to poll the DOM for a certain amount of time when trying to find an element or elements if they are not immediately available. If you omit it, the delay defaults to 0. setTimeout(functionname, milliseconds, arg1, arg2, arg3...) The following are the parameters − How to add sleep/wait function before continuing in JavaScript? Many thanks to Michael Andrews who adapted my original code for seconds to make it work for milliseconds and Artur Kraft who sent me this code, which is more elegant than my original solution was. They do not want to wait 10 seconds when they do not have too. There are many good intros to async/await available, so I won’t go into a full discussion here, but the 15 sec. We need to modify it using promises to print sequentially 0 to 10. The above code will not do what you want, though. It will just call and move to next time and print 1,2,3 in console after three seconds. alert(x); The third method is what I suggest doing: Remove the timer. Originally published by Just Chris on November 11th 2017 157,750 reads @jsborkedJust Chris. Simply click the demo link and wait for five seconds to display the alert: See online demo and code. However, Sleep should be used carefully. JavaScript is a scripting or programming language that allows you to implement complex things on web pages. We need to modify it using promises to print sequentially 0 to 10. This quickly falls apart, however, because users easily type faster than your server can respond. Universe! It means that if you specify duration to be, say, 1 second, JavaScript does not guarantee that it will start running the code after the sleep exactly after 1 second. This window will close automatically within 10 second(s) > Count down … Well organized and easy to understand Web building tutorials with lots of examples of how to use HTML, CSS, JavaScript, SQL, PHP, Python, Bootstrap, Java and XML. Run JavaScript code or call a function after n seconds. The code works like so: The setTimeout function is queued immediately for future execution (after 3 seconds) The for loop moves on to the next iteration right away So for example $(element).delay(3000).fadeIn(250); will make the element fade in after 3 seconds. popup an alert box, otherwise do nothing: You need to wait 4 seconds to see the alert box. But we don’t want this. Following example will delay 4 seconds, then popup a confirm box, if the user clicks "OK", You may also notice that the month of July is represented by 6… The function will be executed after 5 seconds (5000 milliseconds). Sleep() With the help of Sleep() we can make a function to pause execution for a fixed amount of time. while(d2-d < ms); After that, we can call that delay function inside any asynchronous context as we like.eval(ez_write_tag([[728,90],'delftstack_com-medrectangle-3','ezslot_5',113,'0','0'])); The delay function can also be Optimized using the arrow syntax in ECMAScript 6 as the following example: Suppose we don’t have any asynchronous context to use the above delay() function or don’t want to use the setTimeout() function. But JavaScript does not have that native function. Body. Tip: Use the clearTimeout() method to prevent the function from running. // we need to call async wait() and wait to get 10 // remember, we can't use "await" } P.S. For example, if 0 takes 6 seconds to print and 1 takes two seconds to print, then 1 should wait for 0 to print and so on. The await operator is used to wait for a Promise. The setTimeout() method calls a function or evaluates an expression after a specified number of milliseconds. The two key methods to use with JavaScript are: setTimeout(function, milliseconds) Executes a function, after waiting a specified number of milliseconds. But we should thank … We want to process the array in sequence and wait for the current item to finish it’s process and then move to next item. After the DIV is shown I need the function to wait for one of the buttons to be clicked, then proceed with the rest of the code. Didn't it wait? For the demo, I have used the SweetAlert plug-in, that enable creating nice JavaScript alerts. waited for 2 seconds waited for 4 seconds This is failure callback Use of async or await() function: This method can be used if the exact time required in setTimeout() cannot be specified. Output: waited for 2 seconds waited for 4 seconds This is failure callback Use of async or await() function: This method can be used if the exact time required in setTimeout() cannot be specified. You can use Thread Sleep Method to wait for 5 mins and then redirect. How to use with wait(), notify() and notifyAll() methods. JavaScript executes linearly, one line after another. If you need to repeat execution, use the setInterval() method.. Created: November-28, 2020 | Updated: December-10, 2020. Sleep() With the help of Sleep() we can make a function to pause execution for a fixed amount of time. what happens is that after i hit submit the page tries to save and while its doing that it also tries to update the fields which in turn causes the fields not to update. For example, if 0 takes 6 seconds to print and 1 takes two seconds to print, then 1 should wait for 0 to print and so on. The async keyword is used to create an asynchronous function that returns a promise that is either rejected or resolved. The code use a setTimeout function to initiate a countDown() that decrement a value continuously when the start button is clicked. the web resource has a button labeled submit. Wait 3 seconds, and the page will alert "Hello":