JavaScript 中的「setInterval」和「setTimeout」有什麼不同？

Understanding the Difference Between 'setInterval' and 'setTimeout' in JavaScript

In JavaScript, 'setInterval' and 'setTimeout' are powerful functions that control time-based execution of code. While both functions involve scheduling tasks to run after a specified delay, they differ significantly in their underlying behavior.

'setInterval': Repeated Execution

'setInterval' is specifically designed for repeated execution of a task at regular intervals. When called, it creates a timer that runs the specified code or function repeatedly, with a fixed delay between each repetition. This behavior makes it ideal for tasks that need to occur on an ongoing basis, such as animations or blinking elements.

Code Sample:

const intervalID = setInterval(() => {
  console.log("Hello World!");
}, 1000); // Executes every second

'setTimeout': One-Time Execution

In contrast, 'setTimeout' schedules a one-time execution of code or function after a specified delay. It creates a timer that waits for the specified amount of time and then triggers the execution of the task. Once the task is complete, the timer is automatically cleared.

Code Sample:

setTimeout(() => {
  console.log("Hello World!");
}, 5000); // Executes after 5 seconds

Key Distinction:

The fundamental difference between 'setInterval' and 'setTimeout' lies in the nature of their execution. 'setInterval' triggers repeated execution at regular intervals, while 'setTimeout' performs a one-time execution after a specified delay. This distinction has crucial implications for the appropriate use of each function in various programming scenarios.

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